Vegetables
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Browsing Vegetables by Author "Hsiso, T.C."
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Item Effects of Water Stress on Growth and Yield of Field-Grown Tomatoes I : Canopy Development and Biomass Accumulation(1989) Nyabundi, J.O.; Hsiso, T.C.; University of CaliforniaIn tomato plants subjected to different levels of water stress under field conditions of deep soils, it was found that drought had little or no effect on leaf water potential. However, biomass and leaf area developments were markedly depressed. Photosynthesis of the upper-most mature leaves was also affected, but this effect was largely attributed to leaf age; the dry treatment had older leaves with low photosynthetic efficiency. It was concluded that water stress depressed biomass accumulation mainly by inhibiting leaf area development. This occurred in two ways: first, through the reduced photosynthetic area arising from a small canopy, and second, since water stress depressed leaf area development, canopies of stressed plants consisted of a relatively large proportion of old leaves, which have low photosynthetic rates. This led to lower photosynthetic efficiency in such canopies.Item Effects of Water Stress on Growth and Yield of Field-Grown Tomatoes. II: Biomass Partitioning between Vegetative and Reproductive Growth(1989) Hsiso, T.C.; Nyabundi, J.O.; University of CaliforniaMuch work has been done in attempts to understand crop water requirements during different phenological stages with a view to increasing crop yields under conditions of rainfall limitation. Many of these studies have been based on the hypothesis that moisture availability at certain phenological stages is critical to crop yield (Salter and Good, 1967). Identification of such stages would allow selective water application thus economizing on water and reducing irrigation OASIS whilst minimizing yield losses. In rained agriculture, timing of planting would be adjusted so that the critical phases would not occur during periods of drought.
