全文获取类型
收费全文 | 227篇 |
免费 | 15篇 |
国内免费 | 39篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 11篇 |
2015年 | 10篇 |
2014年 | 15篇 |
2013年 | 16篇 |
2012年 | 11篇 |
2011年 | 21篇 |
2010年 | 10篇 |
2009年 | 14篇 |
2008年 | 12篇 |
2007年 | 18篇 |
2006年 | 12篇 |
2005年 | 11篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 16篇 |
2001年 | 1篇 |
2000年 | 6篇 |
1999年 | 9篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有281条查询结果,搜索用时 125 毫秒
21.
Mingdeng Tang Feng Hu Longhua Wu Yongming Luo Yugen Jiang Changyin Tan 《International journal of phytoremediation》2009,11(1):81-93
A pot experiment and a field experiment were conducted to investigate Cu-enriched composts made from Elsholtzia splendens plants as basal fertilizers to correct Cu deficiency in winter wheat (Triticum aestivum L.) grown in Cu-deficient soils. An application of the compost significantly increased plant height, biomass, grain yield, and 1000-grain weight. In the pot experiment, plant height and shoot biomass in the 2% Cu-rich compost treatment increased 0.8- and 5.2-fold compared with the chemical fertilizer treatment at the mature stage. Compared to chemical fertilizer control, the 2% Cu-enriched compost addition increased grain yield per pot by about 9.5-fold and 1000-grain weight by about 50%. In the field study, the compost also showed stimulatory effects on plant growth and grain yield. The results indicate that composting E. splendens plants grown in a Cu-contaminated soil and then applying the compost to a Cu-deficient soil may be an effective technique for the remediation of contaminated soils and redistribution of the copper as a plant nutrient for copper-deficient soils. 相似文献
22.
J. Kimpinski C. E. Gallant R. Henry J. A. Macleod J. B. Sanderson A. V. Sturz 《Journal of nematology》2003,35(3):289-293
A 7-year study located in Prince Edward Island, Canada, examined the influence of compost and manure on crop yield and nematode populations. The compost used in this study consisted of cull waste potatoes, sawdust, and beef manure in a 3:3:1 ratio, respectively. No plant-parasitic nematodes were detected in samples collected from windrow compost piles at 5- and 30-cm depths prior to application on field plots. Low population densities of bacterial-feeding nematodes were recovered from compost windrows at the 5-cm depth. Field plots of potato (Solanum tuberosum cv. Kennebec) received compost applied at 16 metric tonnes per hectare, or beef manure applied at 12 metric tonnes per hectare. An adjacent trial with barley (Hordeum vulgare cv. Mic Mac) received only the compost treatment. In both trials the experimental design was a complete randomized block with four replicates. Data averaged over seven growing seasons indicated that population levels of root-lesion nematodes (primarily Pratylenchus penetrans) were higher in root-zone soil in potato plots treated with either compost or manure compared to the untreated control plots. The soil amendments did not affect root-knot nematode (Meloidogyne hapla) population densities in the potato plots, but clover-cyst nematodes (Heterodera trifolii) were more numerous in the root-zone soils of barley treated with compost compared to the untreated plots. Numbers of bacterial-feeding nematodes (primarily Diplogaster lheritieri) were greater in soil in potato plots treated with manure and in soil around barley roots than in untreated plots. Total yields of potato tubers averaged over seven growing seasons increased by 27% in the plots treated with either compost or manure. Grain yields of barley also were increased by 12% when compost was applied. These results indicated that organic amendments increased crop yields, but the impacts on different nematode species varied and usually increased soil population levels. 相似文献
23.
Immobilization and phytoavailability of cadmium in variable charge soils. III. Effect of biosolid compost addition 总被引:1,自引:0,他引:1
We examined the effect of biosolid compost on the adsorption and complexation of cadmium (Cd) in two soils (Egmont and Manawatu) which varied in their organic matter content. The effect of biosolid compost on the uptake of Cd from the Manawatu soil, treated with various levels of Cd (0–10 mg Cd kg–1 soil), was also examined using mustard (Brassica juncea L.) plants. The transformation of Cd in soil was evaluated by a chemical fractionation scheme. Addition of biosolid compost increased negative charge in soil. The effect of biosolid compost on Cd adsorption varied between the soils, with a large portion of the sorbed Cd remaining in solution as an organic complex. Increasing addition of Cd increased Cd concentration in plants, resulting in decreased plant growth at high levels of Cd (i.e., phytotoxicity). Addition of biosolid compost was effective in reducing the phytotoxicity of Cd as indicated by the decrease in the concentration of NH4OAc extractable-Cd and soil solution-Cd. The solid-phase fractionation study indicated that the addition of biosolid compost decreased the concentration of the soluble and exchangeable Cd fraction but increased the concentration of organic-bound Cd fraction in soil. Alleviation of Cd phytotoxicity by biosolid compost can be attributed primarily to complexation of Cd by the organic matter in the biosolid compost. 相似文献
24.
Wen Guang Bates T. E. Inanaga S. Voroney R. P. Hamamura K. Curtin D. 《Plant and Soil》2002,246(2):241-248
Organic wastes such as sewage sludges contain copper (Cu). Increased attention to environmental protection requires that wastes be treated with pathogen-eliminating procedures before application to farmland. It is not clear, however, if such procedures affect the plant availability of Cu in the wastes. This 2-year field research investigated the effect of irradiation and composting on Cu availability in sludges and manure using a yield control approach. Four organic wastes [digested and dewatered (DSS), digested and irradiated (DISS), composted (DICSS) sewage sludges and composted livestock manure (CLM)] were applied at four rates (10, 20, 30 and 40 t solid ha–1 year–1) with supplemented N and K fertilizers. A control treatment (CT) received N and K fertilizers only. Beans, lettuce and petunias were grown in first year and lettuce were harvested twice in second year. Beans appeared to have a strong ability to absorb Cu compared with the other test crops. In general, crop Cu concentration responses to Cu applied in DSS and DISS were well described by quadratic equations. Tested by a paired t-test, Cu concentration in bean pods was higher in DISS than in DSS treatment, indicating that irradiation increased phytoavailability of Cu. However, the parabolic response of crop Cu to Cu applied in DISS, suggesting that the increases were confined to the lower rates of DISS. Copper applied in DICSS did not increase Cu concentration in any of the test crops. At a given level of applied Cu, crop Cu tended to be lower in DICSS than in DSS or DISS treatment. Sludge composting depressed phytoavailability of Cu. Copper concentration in CLM was much lower than in sludges and sludge composts, but application of CLM increased Cu concentration in bean pods. The pattens of Cu concentration in the two cuts of lettuce in 1991 to Cu applied in CLM were similar, where low rates of CLM application slightly reduced Cu concentration, then the Cu concentration increased with increased rates. The dynamics of available Cu supply were different in the sludge composts and manure composts. 相似文献
25.
26.
P. Alvarenga A. de Varennes A. C. Cunha-Queda 《International journal of phytoremediation》2014,16(2):138-154
A semi-field experiment was conducted to evaluate the use of mixed municipal solid waste compost (MMSWC) and green waste-derived compost (GWC) as immobilizing agents in aided-phytostabilization of a highly acidic soil contaminated with trace elements, with and without a plant cover of Agrostis tenuis. The compost application ratio was 50 Mg ha–1, and GWC amended soil was additionally limed and supplemented with mineral fertilizers.Both treatments had an equivalent capacity to raise soil organic matter and pH, without a significant increase in soil salinity and in pseudo-total As, Cu, Pb, and Zn concentrations, allowing the establishment of a plant cover. Effective bioavailable Cu and Zn decreased as a consequence of both compost treatments, while effective bioavailable As increased by more than twice but remained as a small fraction of its pseudo-total content. Amended soil had higher soil enzymatic activities, especially in the presence of plants.Accumulation factors for As, Cu, Pb, and Zn by A. tenuis were low, and their concentrations in the plant were lower than the maximum tolerable levels for cattle. As a consequence, the use of A. tenuis can be recommended for assisted phytostabilization of this type of mine soil, in combination with one of the compost treatments evaluated. 相似文献
27.
28.
The abiotic conditions required for eradication of Polymyxa betae, the vector of Beet necrotic yellow vein virus in sugar beet, were investigated. Survival of resting spores of P. betae was determined under aerobic (30 min, 4 days and 21 days) and anaerobic (4 days) conditions under several temperature regimes in a water suspension and in leachate extracted from an aerobic compost heap. In water under aerobic conditions the lethal temperature was 60, 55 and 40°C for exposure times of 30 min, 4 days and 21 days, respectively. The effect of compost leachate and/or anaerobic conditions on survival of P. betae depended on temperature. After incubation for 4 days at 20°C, no significant effects of anaerobic conditions or leachate on the survival of P. betae were found. However, at 40°C for 4 days under anaerobic conditions, survival of P. betae was significantly lower than survival under aerobic conditions in water as well as in leachate. In leachate taken from an aerobic compost heap, aerobically incubated at 40°C for 4 days, survival of P. betae was significantly lower than survival in water at the same temperature. As anaerobic spots are prevalent in aerobic compost heaps, especially during the thermophilic phase, actual inactivation temperatures under composting conditions are likely to be lower than the temperatures we found for eradication in water under aerobic conditions. 相似文献
29.
Suppression of Pythium ultimum by Biowaste Composts in Relation to Compost Microbial Biomass, Activity and Content of Phenolic Compounds 总被引:1,自引:0,他引:1
Seventeen composts from separately collected organic household waste plus one bark compost and one compost from grape marc were analysed for suppression of Pythium ultimum, phytotoxicity, microbial biomass and activity, substrate-induced respiration, extractible phenolic compounds and other physical and chemical parameters. Nine of the samples were mildly suppressive to P. ultimum, the others were conducive. The bark compost sample was strongly suppressive. Therefore of the examined composts, only the bark could be used to exert an economically relevant control of P. ultimum in horticultural media. A large part of the compost samples was slightly phytotoxic. Microbial biomass and SIR had only weak correlations with disease incidence. Microbial activity and content of extractible phenolics were positively correlated with disease incidence. None of the tested parameters were therefore suitable as a predictive test for suppression of P. ultimum with the compost samples used in this study. 相似文献
30.
Sawdust was composted by inoculation with a cellulose-decomposing fungus (Cephalosporium sp.) and an N2-fixing bacterium (Azospirillum brasilense). The product was investigated as a possible carrier for Bradyrhizobium, Rhizobium and Azospirillum. The simple technology and composition of the carrier supported good growth and survival of the investigated strains. Yield increases following crop inoculation with the carrier containing the Bradyrhizobium/Rhizobium/Azospirillum mixture were observed with soybean (34–62%), groundnuts (4–39%), lucerne (24–82%) and a grass mixture of bird's foot trefoil and ryegrass (20–21%). 相似文献