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Maturity dates affect soybean seed constituents protein, oil ash and moisture

Author(s): Shad K. Khalil | John G. Mexal | Leigh W. Murray

Journal: Pakistan Journal of Biological Sciences
ISSN 1028-8880

Volume: 3;
Issue: 12;
Start page: 2020;
Date: 2000;
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Keywords: Soybean | maturity dates | seed constituents

The quality of soybean seed at harvest is dependent on the field production environment during development and maturation on the plant. These investigations were conducted to evaluate the effect of planting dates on soybean protein, oil, ash and moisture content. Soybean seeds were planted in the spring (January 13, January 16, February 19 and March 1) and in the Fall (July 10, July 20, July 26 and August 25, 1991) at Agriculture Research Institute, Tarnab, Peshawar, Pakistan. Planting dates were manipulated in such a way that seed developed and matured at high temperature for spring planted crops, while seed development and maturation occurred at low temperature for all planted crops. Mature seeds that developed under these conditions were analyzed for differences in composition. Protein, oil and ash contents were strongly affected by planting date (different temperature at pod fill). Seed that matured at high temperature (spring planting) resulted in higher protein, oil and ash content than the seed that matured at low temperature (fall planting). A positive correlation was found between protein and oil content and protein and ash content. The effect of temperature during pod filling storage was much greater than the temperature during early growth. Protein, oil and ash contents were positively correlated with temperature during pod filling stage and increased with each increment of temperature. Moisture content was unaffected by planting date.

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