出穂後施用窒素がコムギの子実タンパク質に及ぼす影響

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The protein content of wheat grain produced in Kinki and Chugoku district (western warm part) of Japan is low and the objective of this study was to investigate the effect of a top-dressing of nitrogen fertilizer after anthesis on nitrogen accumulation and protein composition in wheat grain. The results are summarized as follows : 1) Wheat protein content and grain liter weight were increased by nitrogen top-dressing after anthesis without changing stem length, ear length or yield. Though little difference in soil nitrogen content was detected between the fields with and without rice straw incorporation, growth and grain yield were decreased by the incorporation. 2) The accumulation of nitrogen in grain was approximately 70% of the absorbed nitrogen in a plant. On the contrary, 90% of nitrogen top-dressed after anthesis accumulated in grain. There was little difference in top-dressing nitrogen absorption in plant between 18 d after fertilization and harvest time. This indicated that the absorption of top-dressed nitrogen was completed before 18 d after fertilization. Accumulation rate of top-dressed nitrogen in grain at harvest time was approximately 40%. 3) Analysis of nitrogen accumulation in grain among the solvent extracted fractions, i.e. low molecular weight protein, gliadin, glutenin and insoluble fractions, revealed that top-dressed nitrogen did not specifically accumulate in the low molecular weight protein fraction, accumulating more in the gliadin fraction. The nitrogen accumulation in gliadin increased with the increase in grain protein content.
社団法人日本土壌肥料学会の論文
2001-06-05

出穂後施用窒素がコムギの子実タンパク質に及ぼす影響

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