EFFECTS OF SOIL-MOISTURE STRESS AT DIFFERENT PERIODS OF GROWTH OF SOME VEGETABLE CROPS

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Abstract
Growth and marketable yield of vegetables were reduced by high soil moisture stress at any stage of growth. Reduction was greatest when periods of high soil-moisture stress and atmosphere stress coincided, and with the number of times maximum stresses developed during any period of growth. Yield and quality of cabbage, broccoli, lettuce, radish and onions were reduced most by high soil moisture stress during head, root or bulb enlargement. Snapbeans grown in late summer and early fall were affected most during vegetative growth and flowering. Soil moisture stress had no effect on mineral nutrient content of lettuce but acid-hydrolyzable carbohydrates decreased with increasing stress. Relative turgidity of cabbage, snapbean. and lettuce leaves decreased and cell sap concentration increased with soil moisture stresses up to 4 bare.

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