Abstract
Photosynthetic components, dry matter production and yield in water stressed mungbean (Vigna rrsdinfa (L. ) Wilczek) plants were compared with those of non-stressed or well watered plants grown in a semi-controlled environment. Mungbean plants were subjected to variable water stress at three growth stages viz. from pre-flowering, flowering and pod development to harvest, The effect of soil moisture on the grain yield varied with the severity of stress and stage of crop growth. Water deficits during pre-flowering to harvest affected most the crop production, photosynthetic rate and the factors related. Soil moisture saturation reduced the yield to about 6 % of that of well watered plants. The yield loss was primarily caused by the reduction of canopy development, inhibition of photosynthetic rate and lower dry matter production. Optimum soil moisture for the growth and photosynthetic rate in mungbean plant was found around 0.15cm3/cm3.
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