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Effect of fluctuating soil moisture conditions on growth yield and nitrogen status of two mung bean vigna radiata varieties



Effect of fluctuating soil moisture conditions on growth yield and nitrogen status of two mung bean vigna radiata varieties



Indian Journal of Plant Physiology 28(4): 395-406



Two mungbean varieties were subjected to fluctuating soil moisture conditions in pot culture during kharif 1981 with a view to understand their response to similar conditions of soil moisture met with during the rainy season (kharif) in northern India. Two soil moisture levels i.e. 12-14% (2/3 field capacity) and 5-7% (1/3 field capacity) were maintained for each variety. After 20 days from sowing the soil moisture of pots from each of the two water regimes was raised to 6% above field capacity (half way between saturation moisture and the field capacity) for 7 days at a stretch. This high water treatment was repeated after 7 days. The vegetative growth of Pusa Baisakhi and PS 16 was little affected by different soil moisture levels. During the reproductive stage of growth, pod weight, pod number, seed weight and seed number were adversely affected by the 1/3 f.c. moisture regime but with a 7-day cycle of high soil moisture supply these effects were nullified. Observations at maturity, which included plants from six soil moisture treatments, revealed that both Pusa Baisakhi and PS 16 suffered under the low soil moisture conditions. The former variety recovered fully from the adverse effects of low soil moisture level after receiving 7-day high soil moisture treatments, whereas the latter variety showed no such come-back. The greater response to fluctuations in soil moisture regimes shown by Pusa Baisakhi is attributable to its large leaf area compared to that of PS 16. The percentage nitrogen content and the proportional distribution of nitrogen among different plant parts was not much affected under any of the water supply conditions. It is suggested that the variety Pusa Baisakhi has characters which make it more suitable for cultivation during kharif season in areas with irregular monsoon rains.

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