Carbon-Nitrogen Interaction Related to P, K, Ca, and Mg Nutrients in Field Crops

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概要

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• Carbon (dry matter)-nitrogen relationship was expressed as DM_t=DM_0×exp(CNI×N_t) in Gramineae crops (including root crops), and DM_t=DM_0+CNI'×N_t in Leguminosae crops, where DM_t is the amount of dry matter at various growth stages, N_t is the amount of nitrogen absorbed at various growth stages, DM_0 is the initial value, and CNI and CNI' are coefficients. Thus, since the carbon-nitrogen relationship was different between Gramineae and Leguminosae crops, it is expected that the accumulation processes of other minerals such as phosphorus (P), potassium (K), calcium (Ca), or magnesium (Mg) during growth would be different between Gramineae and Leguminosae crops if these nutrients are closely related to the carbon and nitrogen metabolism. As nitrogen is the most important nutrient for plant growth, the relationship between N_t and the amount of other minerals such as phosphorus (P_t), potassium (K_t), calcium (Ca_t), or magnesium (Mg_t) absorbed in plants at various growth stages was examined in field crops. In Gramineae crops, the P_t-N_t, K_t-N_t, and Mg_t-N_t relationships during growth were described as follows : P_t = P_0×exp(PNI×N_t), K_t = K_<max>/(1+KNI×(DM_0×exp(CNI×N_t))^<-1>), Mg_t = Mg_0+MgNI×N_t, where P_0 and Mg_0 are initial values, and PNI, KNI, K_<max> and MgNI are coefficients. Since the P_t-N_t and K_t-N_t relationships changed according to the growing conditions, the values of PNI and KNI were statistically estimated from the data of various growth stages at each treatment. As PNI showed a linear regression with CNI, P_t and also K_t was expressed by the equation which included CNI. Thus both phosphorus and potassium accumulation were closely related to the carbon-nitrogen interaction. While the Mg_t-N_t relationship was less affected by various growing conditions, MgNI was estimated from the data including all treatments, indicating that Mg accumulation was regulated only by nitrogen nutrient. Ca_t was not related to N_t. In Leguminosae crops, the P_t-N_t, K_t-N_t, and Mg_t-N_t relationships were described as follows : P_t=P_0+PNI'×N_t, K_t=K_0+KNI'×N_t, Mg_t=Mg_0+MgNI×N_t, where P_0, K_0, and Mg_0 are initial values, and PNI' and KNI' are coefficients. Since the P_t-N_t, K_t-N_t, and Mg_t-N_t relationships are less affected by various growing conditions as in the case of DM_t-N_t, the values of PNI' and KNI', and MgNI were estimated from the data including all treatments. Thus, P, K, and Mg accumulation was closely regulated by N nutrient. Ca_t was not related to N_t. Consequently, in Gramineae crops, P and K accumulation was assumed to be related to the carbon-nitrogen interaction, while in Leguminosae crops, P and K accumulation was assumed to be related to only nitrogen nutrient, indicating that the role of P and K nutrients differed according to differences in the balance of the carbon-nitrogen metabolism. Since MgNI was estimated from the same form of Mg_t-N_t regression regardless of Gramineae and Leguminosae crops, Mg accumulation was assumed to be closely regulated by only nitrogen nutrient. Ca accumulation was neither related to N nutrient nor carbon-nitrogen interaction.

• 社団法人日本土壌肥料学会の論文

著者

• OSAKI Mitsuru

  Laboratory of Ecological Chemistry, Division of Applied Bioscience, Graduate School of Agriculture,

• Zheng Taigen

  Faculty Of Agriculture Hokkaido University

• Tadano Toshiaki

  Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University

• Zheng Taigen

  Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University

• Konno Kazuo

  Branch of Hokkaido Central Agricultural Experiment Station

• Okumura Masatoshi

  Hokkaido Central Agricultural Experimental Station

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