Response to Temperature in a Stand of Pearl Millet (Pennisetum typhoides S. & H.): VIII. ROOT GROWTH

P J. Gregory. 1986. Response to temperature in a stand of pearlmillet (Pennisetum typhoides S. & H.). VIII. Root growth—J.exp. Bot. 37: 379–388. Two experiments were made in controlled glasshouscs to investigatethe growth of roots of pearl millet at different air and soiltemperatures. The experimental plants were grown in columnsof soil within stands of millet for 3 to 4 weeks and destructivelysampled at regular intervals to estimate the length of individualroot axes and of the root system. The length of individual rootaxes increased exponentially with time and at any particulartime the rate of extension was faster the higher the soil temperature.Clear ontogenctic effects on the rates of elongation were detected,with each succeeding axis elongating faster than its predecessor.Total root length was longer the higher the soil temperature(at a particular air temperature) and increased exponentiallywith time and with thermal time assessed from temperatures measuredat 2·0 cm depth. Whereas length at a particular timehad a 10-fold range, length at a particular thermal time hadonly a 3-fold range. Mean irradiance differed between the twoexperiments and as a means of exploring the importance of carbohydrateresources for root extension, relations between root length,leaf area and the amount of radiation intercepted were sought. Root length and leaf area were linearly related for all temperaturetreatments in both years as were root length and interceptedradiation. However, whilst the former relation was the samein both years, the latter was different. Root dry weight andintercepted radiation were also linearly related with the samerelation for both years so that the root length: weight ratiosdiffered between years because of factors not controlled inthese experiments. The results show the close relation between root and shoot growthand that thermal time together with the amount of radiationintercepted by the leaves might be used as the basis for quantifyingthe effects of temperature on root growth. Key words: Pearl millet, temperature, thermal time, root extension, root growth     

Effects of Low Temperature on Growth and Nutrient Accumulation in Rye (Secale cereale) and Wheat (Triticum aestivum)

Rye (Secale cereale cv. Rheidol) and wheat (Triticum aestivumcv. Mardler) were grown at shoot/root temperatures of 20/20°C (warm grown, WG plants), 8/8 °C (cold grown, CG plants)and 20/8 °C (differential grown, DG plants). Plants fromcontrasting growth temperature regimes were standardized andcompared using a developmental timescale based on accumulatedthermal time (°C d) at the shoot meristem. Accumulationof dry matter, nitrogen and potassium were exponential overthe time period studied (150–550 °C d). In rye, therates of plant dry matter and f. wt accumulation were linearlyrelated to the temperature of the shoot meristem. However, inwheat, although the rates of plant dry matter and f. wt accumulationwere temperature dependent, the linear relationship with shootmeristem temperature was weaker than in rye. The shoot/rootratio of rye was stable irrespective of growth temperature treatment,but the shoot/root ratio of wheat varied with growth temperaturetreatment. The shoot/root ratio of DG wheat was 50% greaterthan WG wheat. In both cereals, nutrient concentrations anddry matter content tended to be greater in organs exposed directlyto low temperatures. The mean specific absorption rates of nutrientswere calculated for the whole period studied for each species/temperaturecombination and were positively correlated with both plant shoot/rootratio and relative growth rate. The data suggest that nutrientuptake rates were influenced primarily by plant demand, withno indication of specific nutrient limitations at low temperatures. Nutrient accumulation, relative growth rate (RGR), rye, Secale cereale cv. Rheidol, temperature, thermal time, Triticum aestivum cv. Mardler, wheat     

Effects of Low Temperature on the Development and Morphology of Rye (Secale cereale) and Wheat (Triticum aestivum)

Seedlings of Secale cereale cv. Rheidol and Triticum aestivumcv. Mardler were grown at shoot/root temperatures of 20/20 °C,20/8 °C and 8/8 °C. During vegetative growth both cerealsproduced leaves, tillers and roots in a defined pattern, ata species-specific rate which was linearly related to the temperatureof the shoot meristem. Thus, plant development could be standardizedon a temperature x time (°C d) basis despite contrastinggrowth-temperature treatments. When compared at a similar developmentalstage, the cooling of whole plants or of plant roots resultedin an increase in the d. wt: f. wt ratio of both shoot and roottissues, a decrease in the length of both the longest shootand root, and the development of broader and thicker leaves.Although the effects of temperature on developmental characteristicscould be accurately predicted by an empirical relationship,the effects on morphological characteristics could not. Development, phyllochron, rye, Secale cereale cv. Rheidol, temperature, thermal time, Triticum aestivum cv. Mardler, wheat     

Effects of temperature on the development and growth of winter wheat roots

Wheat plants were grown in columns of soil until early stem elongation at a wide range of constant root temperatures. Two light environments were imposed and three levels of nitrogen fertilizer added at sowing. Shoot and root development and growth were measured by destructive sampling to investigate the combined effects of temperature and changing nutrient and assimilate supply. Both mainstem leaf and root axis production were linearly related to thermal time above a base temperature of 0°C. Low irradiance affected the appearance of mainstem tillers and associated nodal root axes. Nitrogen had little effect on shoot or root development but increased shoot area between 6 and 8 mainstem leaves. Higher temperatures and supplementary light resulted in larger root systems when compared at equivalent times after sowing. Total root length and root dry weight increased exponentially with thermal time, based on the mean of 4 cm soil and 2 cm air temperatures, but no single relation existed for all temperature and light treatments. Total plant dry matter, root length and root dry weight increased linearly with accumulated, intercepted, photosynthetically active radiation. Root growth responded less than the shoot to supplementary light. Increasing temperature reduced the proportion of root weight to total plant weight.     

Leaf Extension in Zea mays: II. LEAF EXTENSION IN RESPONSE TO INDEPENDENT VARIATION OF THE TEMPERATURE OF THE APICAL MERISTEM, OF THE AIR AROUND THE LEAVES, AND OF THE ROOT-ZONE

The temperatures of the roots, the apical meristem, and theshoots of Zea mays plants were varied independently of eachother and the rates of leaf extension were measured. When thetemperature of the apical meristem and region of cell expansionat the base of the leaf was kept at 25 °C, changes of leafextension in response to changes of root and shoot temperatureswere less pronounced. When the temperature of the meristematicregion was changed by increments of 5 or 10 °C from 0 to40 °C, and the root and shoot temperatures were kept at25 °C, rapid changes in leaf extension occurred. It was concluded that the rates of leaf extension were controlledat root-zone temperatures of 5 to 35 °C by heating or coolingof the meristematic region. Changes in rates of leaf extensionin response to changes in air temperature were attributed todirect effects on the temperature of the meristematic regionand on the physiology of the leaf.     

Effect of Root and Shoot Meristem Temperature on Shoot to Root Dry Matter Partitioning and the Internal Concentrations of Nitrogen and Carbohydrates in Maize and Wheat

Maize (Zea mays L.) and spring wheat (Triticum aestivum L.)were grown in nutrient solution at uniformly high air temperature(20 °C), but different root zone temperatures (RZT 20, 16,12 °C). To manipulate the ratio of shoot activity to rootactivity, the plants were grown with their shoot base includingthe apical meristem either above (i.e. at 20 °C) or withinthe nutrient solution (i.e. at 20, 16 or 12 °C). In wheat, the ratio of shoot:root dry matter partitioning decreasedat low RZT, whereas the opposite was true for maize. In bothspecies, dry matter partitioning to the shoot was one-sidedlyincreased when the shoot base temperature, and thus shoot activity,were increased at low RZT. The concentrations of non-structuralcarbohydrates (NSC) in the shoots and roots were higher at lowin comparison to high RZT in both species, irrespective of theshoot base temperature. The concentrations of nitrogen (N) inthe shoot and root fresh matter also increased at low RZT withthe exception of maize grown at 12 °C RZT and 20 °Cshoot base temperature. The ratio of NSC:N was increased inboth species at low RZT. However this ratio was negatively correlatedwith the ratio of shoot:root dry matter partitioning in wheat,but positively correlated in maize. It is suggested that dry matter partitioning between shoot androots at low RZT is not causally related to the internal nitrogenor carbohydrate status of the plants. Furthermore, balancedactivity between shoot and roots is maintained by adaptationsin specific shoot and root activity, rather than by an alteredratio of biomass allocation between shoot and roots.Copyright1994, 1999 Academic Press Wheat, Triticum aestivum, maize, Zea mays, root temperature, shoot meristem temperature, biomass allocation, shoot:root ratio, carbohydrate status, nitrogen status, functional equilibrium     

Effects of High Air and Soil Temperature Stress on Growth and Tuberization in Solanum tuberosum

Potato plants (Solanum tuberosum L.) were grown at differentair and soil temperatures to determine the effects of high-temperaturestress on root, tuber, and shoot growth. Cooling the soil (17–27C) at high air temperatures (30–40 C) relieved noneof the visible symptoms of heat stress on shoot growth; norwas the degree of induction to tuberize in leaves increased,as reflected in tuberization of leaf-bud cuttings. Heating thesoil (27–35 C) at cool (17–27 C) air temperatureshad no apparent detrimental effect on shoot growth or inductionof leaves to tuberize. However, in each case hot soil largelyeliminated tuber development. In one experiment stolons grewup out of the hot soil and formed aerial tubers upon reachingthe cool air. When leaf-bud cuttings from induced plants wereused as a model system, high soil temperatures inhibited tuberdevelopment from the buried leaf buds, in the absence of anyroot growth. Apparently the induction of leaves to tuberizeis affected principally by air rather than soil temperature,but expression of the signal to tuberize can be blocked by highsoil temperature. Solanum tuberosum L., potato, temperature stress, soil temperature, tuberization     

The influence of waterlogging at different temperatures on penetration depth and porosity of roots and on stomatal diffusive resistance of pea and maize seedlings

The 8 days old seedlings of pea (cv. Ilowiecki) and maize (cv. Alma F1) were subjected to differentiated aeration conditions (control — with pore water tension about 15 kPa and flooded treatment) for 12 days at three soil temperatures (7, 15 and 25 °C). The shoots were grown at 25 °C while the soil temperature was differentiated by keeping the cylinders with the soil in thermostated water bath of the appropriate temperature. Lowering the root temperature with respect to the shoot temperature caused under control (oxic) conditions a decrease of the root penetration depth, their mass and porosity as well as a decrease of shoot height, their mass and chlorophyll content; the changes being more pronounced in maize as compared to the pea plants. Flooding the soil diminished the effect of temperature on the investigated parameters; the temperature effect remaining significant only in the case of shoot biomass and root porosity of pea plants. Root porosity of pea plants ranged from 2 to 4 % and that of maize plants — from 4 to 6 % of the root volume. Flooding the soil caused an increase in the root porosity of the pea plants in the entire temperature range and in maize roots at lower temperatures by about 1 % of the root volume. Flooding the soil caused a decrease of root mass and penetration depth as well as a decrease of plant height, biomass and leaf chlorophyll content.     

Changes in the Pattern of Cell Division in the Shoot and Root Meristems of Lolium perenne during the Transition from Vegetative to Floral Growth

For Lolium perenne cv. Cropper, a system which resulted in 100%flowering comprised 90 short days (SD) at 4 ?C (vernalization)and 30 SD at 18 ?C followed by 8 long days (LD). The mitoticindex and G1 and G2 percentages were measured in the shoot androot apices of plants following 2, 5 or 8 LD and in SD controlssampled at the beginning and end of induction. Identical measurementswere made in plants given 48 SD at 18 ?C followed by 2, 5 or8 LD; plants remained vegetative in response to this treatmentlacking vernalization. Significant increases in both mitoticindex and meristem size occurred in the shoot apex in LD followingthe vernalizing, but not the non-vernalizing, treatment. A clusterof mitoses in the apical dome of the shoot apex was unique tothe vernalized plants given 5 or 8 LD. However, an increasein root meristem size occurred regardless of vernalization,but a significant increase in the mitotic index was limitedto vernalized plants given 5 or 8 LD. Whilst the vernalization-LDtreatment resulted in an increase in the G2 percentage in theshoot apex following 2, 5 or 8 LD, no such alteration was observedin the root meristem. Thus, the changes to the cell cycle whichcorrelated with flowering were increased mitotic indices andG2 percentages in the shoot apex at each sampling time and increasedmitotic indices in the root apex following 5 and 8 LD. Key words: Cell division, flowering, Lolium perenne L.     

Root Growth and Water Uptake by Maize Plants in Drying Soil

Sharp, R. E and Da vies, W. J. 1985. Root growth and water uptakeby maize plants in drying soil.— J. exp. Bot. 36: 1441–1456. The influence of soil drying on maize (Zea mays L.) root distributionand use of soil water was examined using plants growing in thegreenhouse in soil columns. The roots of plants which were wateredwell throughout the 18 d experimental period penetrated thesoil profile to a depth of 60 cm while the greatest percentageof total root length was between 20–40 cm. High soil waterdepletion rates corresponded with these high root densities.Withholding water greatly restricted root proliferation in theupper part of the profile, but resulted in deeper penetrationand higher soil water depletion rates at depth, compared withthe well watered columns. The deep roots of the unwatered plantsexhibited very high soil water depletion rates per unit rootlength. Key words: Maize, roots, water deficit, soil water depletion     

In Vitro Transformation of Root meristem to Shoot and Plantlets in Vanilla planifolia

A study is reported of histogenesis and organogenesis duringthe processes leading up to plantlet formation in tip culturesof aerial roots of Vanilla planifolia. Young root tips excisedfrom aerial roots, less than 15 cm long, when cultured in liquidMS medium containing IAA and KN showed gravitropic responseuntil cap lysis began. With the collapse of the distal halfof the cap, the cells of the quiescent centre divided forminga hemispherical mass of cells. Further localized divisions onthe periphery of the hemisphere resulted in a number of meristemoidseach of which differentiated into a shoot meristem with leafprimordia. Procambium differentiated first beneath the apicalmeristem after two to three leaf primordia had formed and thenat the base of the leaves. After a few leaves have been formeda root meristem differentiated in close lateral proximity tothe basal end of the shoot procambium. Formation of a plateof vasculature at the nodal region of the first formed leaf,procambialization of the root and the bridging up of the shootand root vasculature with the nodal plate are described. Vanilla planifolia, root tip, in vitro, quiescent centre, meristemoid, plantlet     

Effect of sub-optimal root zone temperatures at varied nutrient supply and shoot meristem temperature on growth and nutrient concentrations in maize seedlings (Zea mays L.)

Maize seedlings were grown for 10 to 20 days in either nutrient solution or in soils with or without fertilizer supply. Air temperature was kept uniform for all treatments, while root zone temperature (RZT) was varied between 12 and 24°C. In some treatments the basal part of the shoot (with apical shoot meristem and zone of leaf elongation) was lifted up to separate the indirect effects of root zone temperature on shoot growth from the direct effects of temperature on the shoot meristem.Shoot and root growth were decreased by low RZT to a similar extent irrespective of the growth medium (i.e. nutrient solution, fertilized or unfertilized soil). In all culture media Ca concentration was similar or even higher in plants grown at 12 as compared to 24°. At lower RZT concentrations of N, P and K in the shoot dry matter decreased in unfertilized soil, whereas in nutrient solution and fertilized soil only the K concentration decreased.When direct temperature effects on the shoot meristem were reduced by lifting the basal part of the shoot above the temperature-controlled root zone, shoot growth at low RZT was significantly increased in nutrient solution and fertilized soil, but not in unfertilized soil. In fertilized soil and nutrient solution at low RZT the uptake of K increased to a similar extent as plant growth, and thus shoot K concentration was not reduced by increasing shoot growth rates. In contrast, uptake of N and P was not increased, resulting in significantly decreased shoot concentrations.It is concluded that shoot growth at suboptimal RZT was limited both by a direct temperature effect on shoot activity and by a reduced nutrient supply through the roots. Nutrient concentrations in the shoot tissue at low RZT were not only influenced by availability in the substrate and dilution by growth, but also by the internal demand for growth.     

Root Zone Temperature Effects on Growth and Phosphate Absorption in Rape Brassica napus cv. Emerald

Solution culture experiments with fodder rape (Brassica napuscv. Emerald) show that reduced root temperatures appear to havelittle effect on phosphate inflow over a wide range of P concentration.At a cool root temperature (10 ?C) plant growth rate was reducedbut this was compensated for by a low root: shoot ratio, sothat inflow remained relatively steady. An increased inflowper unit length of root was only achieved at an elevated roottemperature of 35 ?C. The minimum phosphate concentration towhich plants could lower the culture solution (C_mln) rangedfrom 0.15 to 2.5 mmol m^–3 according to whether roots wereat a low (5 ?C) or high (35 ?C) temperature respectively. Thetotal phosphorus concentration in tissues was affected by rootzone temperature and at low root temperatures this could bea growth limiting factor. The organic (assimilated) fractionof P in shoot tissues was smaller in low temperature plants.These showed visual symptoms of apparent P deficiency. Levelsof inorganic P in roots may also be a factor in feedback ofcontrol of inflow. Key words: Temperature, Roots, Phosphate, Rape (Brassica napus)     

Genotypic Differences in the Temperature Responses of Tropical Crops: I. GERMINATION CHARACTERISTICS OF GROUNDNUT (ARACHIS HYPOGAEA L.) AND PEARL MILLET (PENNISETUM TYPHOIDES S. & H.)

Mohamed, H. A., Clark, J. A. and Ong, C. K. 1988. Genotypicdifferences in the temperature responses of tropical crops.I. Germination characteristics of groundnut (Arachis hypogaeaL.) and pearl millet (Pennisetum typhoides S. & H.).—J.exp. Bot. 39: 1121–1128. The germination at constant temperature of several genotypesof groundnut and pearl millet was investigated between 0?C and50?C on a thermal gradient plate. Large differences in bothgermination rate and percentage germination were observed inboth species. Base temperatures vary from 8–11.5?C and 8–13.5?Cin groundnut and millet, respectively and optimum temperaturesfrom about 29–36.5?C in both. Maximum temperatures forgermination ranged from 41–47?C. The results are discussedin terms of adaptation to high soil temperature and crop establishmentin the semi-arid tropics. Key words: Temperature, germination, millet, groundnut     

Analysis of Dry Matter Partitioning in Dactylis glomerata during Vegetative Growth Using a Carbon Budget Model

The dry matter partitioning in vegetative plants of Dactylisglomerata was studied from experiments performed in controlledenvironments. Plants were grown hydroponically in growth chambers,at two constant temperatures (17 and 25 °C). In both experimentsthe root fraction decreased regularly with time, an effect thatwas more accentuated in the higher temperature regime. In orderto explain the change in dry matter partitioning, the experimentalshoot and root growth were analysed using a carbon budget modelwhich includes shoot and root maintenance requirements. Themodel predicts a relationship between the root specific growthrate and the product of shoot specific growth rate and shootto root dry weight ratio. In the range of experimental accuracy,this relationship was found to be linear at both temperatures,which should indicate that the partitioning coefficients andthe root maintenance coefficient remained constant during vegetativegrowth. The effect of temperature on the value of these coefficientscan be specified from a linear regression analysis. Between17 and 25 °C, the root maintenance coefficient increasedby about a factor of two, whereas the partitioning coefficientsdid not vary significantly. On the basis of these results, itwas shown that the decrease in root fraction during vegetativegrowth should be mainly attributed to the decrease in net specificactivity of shoots.Copyright 1994, 1999 Academic Press Dactylis glomerata L., vegetative growth, model, partitioning, root:shoot ratio, shoot specific activity, maintenance requirements     

Morphogenesis in Selaginella. III. Meristem determination and cell differentiation.

Selaginella willdenovii Baker is a prostrate vascular cryptogam with a dorsiventral stem. At each major branching of the stem tip a dorsal and a ventral angle meristem are formed. The ventral meristem becomes determined as a root and the dorsal meristem as a shoot. Indoleacetic acid (IAA) is transported basipetally in the stem and has been found to be the regulatory agent for meristem determination both in vitro and in vivo.Growth measurements of intact plants indicated that the sequence of development for each stem unit is frond expansion, internodal elongation, ventral meristem growth as a root, and dorsal meristem growth as a shoot. The principal experimental findings of this study are as follows. Triiodobenzoic acid (TIBA), an inhibitor of auxin transport alters the normal pattern of development in intact plants, causing ventral meristems to develop as shoots and dorsal meristems to develop precociously. Dorsal meristems grown in sterile culture on an auxin-free medium develop as shoots, but in the presence of IAA develop as roots. Meristems transferred after excision from auxin-free to plus-auxin medium on successive days showed an increasing tendency to develop as shoots, with more than 50% doing so by day 5. The mitotic index is low at the time of excision of the meristem, rises to a peak on day 5 and then declines.     

Differences in Nitrogen Metabolism During Growth of Plants from Aged Potato (Solanum tuberosum L.) Meristems

The effect of advanced meristem age on growth and accumulationof plant nitrogen (N) in potato (Solanum tuberosum L.) was studied.Etiolated plantlets, excised from sprouted, single-eye-containingcores from 7 and 19-month-old seed-tubers, were transplantedinto aerated nutrient culture. Rates of shoot and root dry matterand shoot soluble-N (which included nitrate-N) accumulationwere similar for plants from both meristem ages over a 30 dinterval of log-linear growth. The rate at which nitrate-N accumulatedwas consistently 17 per cent higher in shoots from 19-month-oldcompared to those from 7-month-old meristems. However, accumulationof free amino-N and soluble protein-N were 21 and 15 per centlower, respectively in shoots from 19-month-old meristems. Abuild-up of shoot nitrate, along with lower rates of accumulationof amino-N and soluble protein-N, suggests a lower capacityfor nitrate reduction during early growth of plants from oldermeristems. Furthermore, these effects can be attributed to age-inducedchanges in the meristem or bud tissue as the plants were separatedfrom the tuber tissue initially in the study. Long-term ageingof seed-potatoes apparently affects changes within meristemsthat translate into a lower capacity to accumulate reduced formsof nitrogen during early plant growth. Potatoes (Solanum tuberosum L.), meristem age, nitrogen metabolism, plant growth potential     

Differential Inhibition of Shootvs.Root Growth at Low Temperature and its Relationship with Carbohydrate Accumulation in Different Wheat Cultivars

Shoot and root growth rate, carbohydrate accumulation (includingfructan), reducing sugar content and dry matter percentage weremeasured in six wheat cultivars, ranging from winter to springtypes, grown at either 5 or 25 °C. At 5 °C (comparedwith 25 °C), the relative growth rate (RGR) of shoots wassimilarly reduced in all cultivars, but the RGR of shoots wasmore affected in winter wheats. This difference resulted insmaller root:shoot ratios than in spring wheats, which alsodeveloped more first-order lateral roots. A direct relationshipbetween carbohydrate accumulation at low temperatures and reductionin root growth was established. These results suggest that differentialshootvs.root growth inhibition at low temperature may play akey role in carbohydrate accumulation at chilling temperatures.This differential response might lead to improvements in survivalat temperatures below 0 °C, regrowth during spring, andwater and nutrient absorption at low temperatures.Copyright1997 Annals of Botany Company Wheat; Triticum aestivum; low temperatures; root growth; root: shoot ratio; sugar accumulation     

Morphogenetic Aspects of a Leafless Mutant in Tomato: III. GROWTH AND PEROXIDASE ACTIVITY OF ROOTS

Using morphological and biochemical criteria, comparisons weremade between intact and excised roots of normal tomato (Lycopersiconesculentum Mill.) and the reduced form of the homozygous lanceolatemutant. Intact normal roots showed greater growth as reflectedin length of the main root axis, number of lateral roots, andprotodermal cell size. Excised normal roots grew more rapidlythan those of the mutant only during the first 24-h intervalof the first week in culture. Intact mutant roots revealed agreater activity of peroxidase, but excised mutant roots showedno increase in enzyme activity. It is concluded that the primarysite of action of the mutant allele is the shoot system, andin particular the leaf marginal meristem. The effects of thelanceolate gene on the root system in tomato are interpretedas being of secondary importance with regard to gene action.     

Root-zone temperature effects on the early development of maize

Summary Maize plants were grown in sand culture under greenhouse conditions from emergence to the 4-leaf stage at root-zone temperature of 12.5°, 15° and 17.5°C in one experiment, and grown to the 6-leaf stage at root zone temperatures of 15°, 20°, and 25°C in a second experiment. Attention was given to plant part differentiation as determined by leaf appearance, and to growth as determined by dry tissue accumulation, at specified growth stages.For anyone growth-stage interval the number of days required for that interval increased with decreasing root-zone temperature. Dry weights of both roots and shoots at the various growth stages decreased with increasing root-zone temperature. Root zone temperature had a direct influence on the meristematic region of the shoots of young maize plants because of the close proximity of this region to the ground surface and thereby regulated plant development during the period of leaf initiation.Increased root-zone temperature enhanced plant development rate relative to plant growth rate thus reducing the ultimate yield of maize at the 4- and 6- leaf stages.It was concluded that because of the direct influence of root-zone temperature on the shoot meristem and hence on the nutrient demands of the shoot, due consideration should be given to this factor in studies concerned with soil temperature.Agronomy Department Paper No. 709.