Ontogenetic Changes of N, P, and K Contents in Individual Leaves of Field Crops

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The ontogenetic changes of N, P, and K contents in leaves of rice, maize, soybean adzuki bean, potato, and sugar beet were studied as the following results were obtained. 1)N content of rice and maize drastically changed at the primordia formation stage, while that of other crops did not show clear changes depending on the stage of growth. 2)P content of rice and maize was higher in upper leaves than lower leaves, but did not change appreciably in other crops. 3)K content of potato and sugar beet remained constant for a long period of time compared to other crops. 4)P-N relationship in rice and maize distinctly differed between upper and lower leaves ; ratio of P content to N content of upper leaves was higher than that of lower leaves. 5)K-N relationship in potato and sugar beet was very different from that in other crops ; K content remained constant regardless of the decrease in N content except for the lower leaves. Thus, as the P-N balance of rice and maize(Gramineae crops)and K-N balance of potato and sugar beet(root crops)showed distinctive characteristics compared to other crops, the physiological significance of the mineral balance must be further investigated.
社団法人日本土壌肥料学会の論文