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Simulating Accumulation and Distribution of Dry Matter in Grain Sorghum¹

Plant growth simulation models bring together what is known about various aspects of plant growth and dry matter accumulation. They are valuable in simulating the effects of management, environmental, or genetic factors on plant growth and in determining what areas of knowledge about plant growth are most lacking. However, most growth models deal only with total dry matter production. Reported here are submodels for calculating stage of development and partitioning dry matter production into plant parts based on these stages of development for grain sorghum (Sorghum bicolor L.).

Testing of the submodels using 25 data sets (from six locations in the sorghum growing area of the United States) including a number of hybrids, several years, and both irrigated and dryland production showed that the submodels provided unbiased estimates of: date of growing point differentiation; date of half-bloom; physiological maturity; grain yield; and harvest index. Precision of modeling stages of development was acceptable for most uses (S.E. of 4.1 to 5.0 days). Standard errors for grain yield and harvest index were 18.4 g/plant (C.V. = 29.0%) and 0.06 (C.V. = 13.2%), respect ively.

Key Words: Modeling • Partitioning • Morphology • Stages of Development • Grain yield

² Research agronomist (on leave from Agronomy Dep., Kansas State Univ.), and assistant professor. Texas Agric. Exp. Stn., Temple, TX 76501.

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