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Studies on the productivity of grain sorghum sorghum bicolor 5. effect of nitrogen fertilization and water stress on the grain yield nitrogen uptake and translocation



Studies on the productivity of grain sorghum sorghum bicolor 5. effect of nitrogen fertilization and water stress on the grain yield nitrogen uptake and translocation



Japanese Journal of Crop Science 50(2): 131-142



Pot experiment was carried out in the Nagoya University Farm [Japan] under glasshouse conditions in 1978 to determine the following conditions: optimum level of N application necessary to obtain higher grain yield and protein content; whether enhancement of growth, grain yield and protein content in grain sorghum (S. bicolor (L.) Moench), hybrid H-726, following a short period of drought, is due to increasing N concentration in the soil during drought period; and, finally, to investigate N uptake and translocation under the different degrees of water stress and N application. The dry weight of panicle, number of grains per panicle and grain and protein yields increased markedly with 8 g N application compared with control (6 g), but these parameters decreased with increasing N application. In this experiment, it was clear that 10 and 12 g urea per 1/2000 Wagner's pot were heavy applications, while 8 g was the optimum level. With increasing N application, there was an increase in percent crude protein and conversely, grain yield decreased. There was no significant difference for percent crude starch in grain with increasing N application. From the data of the percent N content in grain to N content in whole plant, it can be said that, with higher application of N, the absorbed N accumulated more in the vegetative parts and less translocated into the grains. Although the N concentration in the soil increased during the short period of drought due to suspension of irrigation, no relationship was found between increasing concentration of N in the soil and increasing grain and protein yields. Imposition of a short period of drought (approximately 10 days) at 6th leaf emergence stage, and rewatering before wilting, resulted in an increase in grain and protein yields due to enhancement of N uptake and/or N translocation even under higher N application.

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