Productivity of High-Yielding Crops V. Root Growth and Specific Absorption Rate of Nitrogen

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"Standard yield variety" and "high-yielding variety" of rice, winter wheat, maize, soybean, potato, beet, and sunflower were grown, and the relationship between root growth and absorption of nitrogen was studied. To estimate the role of root in nitrogen absorption, nitrogen absorption rate (⊿N, g N m^<-2> d^<-1>) was parametarized into root dry weight (RW, gm^<-2>) and specific absorption rate of nitrogen per root dry weight (SAR_N, ⊿N RW^<-1>). 1)Since during the vegetative growth stage, the correlation between ⊿N and crop growth rate (CGR) was high, ⊿N was under the control of shoot demand for nitrogen, while during the early maturing stage, ⊿N was well correlated with SAR_N except for sunflower. Thus, ⊿N at the vegetative growth stage was regulated by shoot growth (CGR), which was related to RW sometimes. Thereafter, ⊿N was regulated by SAR_N with the progression of growth. 2)Based on the cluster analysis of SAR_N or RW for ⊿N, and correlation between ⊿N and SAR_N or RW, crops were classified into three groups: group (I), soybean, potato, and beet; group (II), rice, winter wheat, and maize; and group (III), sunflower. During the early maturating stage, ⊿N of group (I) was regulated by mainly SAR_N, ⊿N of group (II) was regulated by both SAR_N and RW, and ⊿N of group (III) was regulated mainly by RW. 3)SAR_N remained high during the early maturation stage in the "high-yielding variety" of crops.
社団法人日本土壌肥料学会の論文

Productivity of High-Yielding Crops V. Root Growth and Specific Absorption Rate of Nitrogen

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