Accumulation and partitioning of nitrogen during seed filling in old and modern soybean [Glycine max] cultivars in relation to seed production
1995
Shiraiwa, T. (Shiga Prefectural Junior Coll., Hikone (Japan)) | Hashikawa, U.
Seed productivity of old and modern soybean cultivars was analyzed in relation to accumulation and partitioning of nitrogen during seed filling. Four soybean cultivars were grown on a drained paddy field (silty clay loam). Dry weight and nitrogen content were determined for above ground parts weekly from the beginning of seed filling to maturity. The modern cultivars Enrei and Tachinagaha exhibited greater dry matter and nitrogen accumulations during seed filling and greater seed yield in comparison with the old cultivars Akazaya and Mizukuguri. Seed nitrogen per top nitrogen (N-seed/N-top) increased linearly against days after the beginning of seed filling, while leaf nitrogen per top nitrogen (N-leaf/N-top) decreased linearly. Cultivar differences in nitrogen partitioning were quite small. Thus N-leaf was mainly dependent on N-top. Nitrogen harvest index (N-seed/N-top at maturity) was not very restrictive to either nitrogen yield or seed yield. It is concluded that the observed difference in seed productivity among old and modern cultivars was associated more with nitrogen accumulation during seed filling than with its partitioning pattern
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