Bunch Planting: Water Conservation
2017 ENCYCLOPEDIA OF SOIL SCIENCE, VOLS I-III, 3RD EDITION 2017 null(卷), null(期), (261-263页)
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Stored soil water and growing season precipitation generally support early season growth of grain sorghum (Sorghum bicolor L. Moench) in dryland areas, but severe water stress is the norm during the later growth stages. Consequently, grain yield is generally low. Further studies have shown that growing grain sorghum in clumps rather than being equally spaced reduces tillering and early season vegetative growth, thereby conserving more soil water for use during the later growth stages. This results in an increase in the harvest index and a higher yield of grain. The architecture of clumped plants is also notably different from uniformly spaced plants. The leaves of both the tillers and main stalk grow outward, exposing essentially all of the leaf area to sunlight and wind. In contrast, clumped plants grow upward with the leaves partially shading one another and reducing the effect of wind, thereby reducing water use.
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