北海道における秋播コムギ子実への施肥窒素の集積と土壌由来窒素の吸収

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The percentage uptake of a fertilizer nitrogen (N) by winter wheat (Triticurn aestivurn L. cv. Chihokukomugi) and the distribution of absorbed N into the grain were investigated by tracing ^<15>N in field experiments. The three-split application of a 12 g N m^<-2> was conducted and (^<15>NH_4) SO_4 was used as each split of fertilizer N. Also, the time course of uptake of soil N by winter wheat was compared with the estimated progress of N mineralization by kinetic analysis. The recovery rates of fertilizer N were 29-40% in the case of application at sowing time, 43% at mid-April, when the regrowth of wheat plants starts after snow melting away and 58-64% at the heading stage. At harvest, the proportion of labelled N absorbed in the grain was 52-63% in the case of application at sowing time, 59-66% at mid-April and 73-81% at the heading stage. At 10-13 d before harvest, 33-45% of absorbed fertilizer N applied at the heading stage was still found in the leaf and steam, and a part of it translocated to the grain during the ripening process. On the other hand, the amount of N absorbed from soil N was 46-60% of the total N in the grain. That indicated the necessity of estimating the progress of uptake of soil N by wheat plants to control the yield and quality of grain. The amount of N mineralized in the soil from sowing time to harvest was estimated at less than 40% of the amoun of soil N absorbed by winter wheat. The residual inorganic N in soil, especially in the sub-soil at sowing time, contributed considerably to N uptake by winter wheat.
社団法人日本土壌肥料学会の論文
1998-12-05

北海道における秋播コムギ子実への施肥窒素の集積と土壌由来窒素の吸収

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