Potassium requirements for growth and its related processes determined by plant analysis in wheat |
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Authors: | N Rama Rao |
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Institution: | (1) Potash Research Institute of India, 19, Sector, 122001 Gurgaon, India |
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Abstract: | Summary Potassium requirements for growth—dry matter (DM) and leaf area (LA) and related processes — relative leaf growth rate (RLGR),
relative growth rate (RGR), net assimilation rate (NAR) and crop growth rate (CGR) were determined by plant analysis during
the entogeny of wheat. Wheat (Triticum aestivum cv. HD 2329) plants were supplied with different amounts of K from deficient to adequate through nutrient solution. Samples
were taken at specific stages for K determinations. The DM and LA were recorded at 45d, 75d and 105d. The growth related processes
RGR, NAR and CGR were estimated between 30–45d, 45–75d and 75–105d. In case of RLGR the observations were carried out between
15–30d, 30–45d and 45–75d. These physiological processes and grain yield were correlated with K concentration in whole plant
at 30 and 45d and top two leaves at 75 and 105d.
The results indicated that k status in plants influences growth mostly through leaf area formation which inturn influences
successively RLGR, RGR and CGR and finally grain yield. For vegetative growth the optimum concentration required in plants
was always lower than the optimum for grain production. |
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Keywords: | Crop growth rate Leaf area Net assimilation rate Potassium Relative growth rate Relative leaf growth rate Tissue analysis Triticum aestivum |
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