EFFECT OF THE SUPPLY OF POTASSIUM, CALCIUM, AND MAGNESIUM ON THE ABSORPTION, TRANSLOCATION, AND ASSIMILATION OF AMMONIUM- AND NITRATE-NITROGEN IN WHEAT PLANTS

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Forty-two-day-old wheat (Triticum aestivum L. var. Asakazekomugi) plants were treated with complete, K-free (-K), Ca-limited (-Ca), and Mg-free (-Mg) nutrient solutions for 10 days using 2 mM NH_4NO_3 as the nitrogen source, which was replaced with 4 mM ^<15>NH_4Cl or Na^<15>NO_3 for the subsequent 2 days to investigate the absorption, translocation,and assimilation of inorganic nitrogen in relation to the mineral supply. In another experiment plants were grown on NO_3^-, NH_4^+, NH_4NO_3, and K-free and Ca-limited NH_4NO_3 nutrient solutions for 10 days, and then in the latter three treatments the nitrogen source was replaced with NO_3^- and half of the -K plants received K for 6 days to examine the changes in the nitrate reductase activity (NRA). Wheat plants absorbed NH_4-N and NO_3-N at a similar rate. Influence of K the absorption of NO_3-N was stronger than that on the absorption of NH_4-N in wheat plants. The supply of K to the -K plants increased the absorption of NO_3-N, while the absorption of NH_4-N still remained at a lower rate in spite of the addition of K. A limited supply of Ca and lack of Mg in nutrient media slightly affected the absorption of NH_4-N. The influence of K was stronger on the translocation of nitrogen form roots to shoots, while Ca and Mg had little effect. When K was supplied again to the -K plants the translocation of NO_3-N was more accelerated than that of NH_4-N. Incorporation of NH_4-N into protein was higher than that of NO_3-N in all the tissues ; root, stem, and leaf. Assimilation of NH_4-N and NO_3-N decreased by the -K and -Mg treatments. Leaf NRA of wheat plants decreased in the -K and -Ca plants. Higher leaf NRA was found when K was given again to the -K plants than when the plants were continuously grown in K-fee media. Replacement of NO_3^- with NH_4^+ as the nitrogen source caused a decline of leaf NRA, while the supply of both NH_4-N and NO_3-N slightly affected the leaf NRA.
社団法人日本土壌肥料学会の論文

EFFECT OF THE SUPPLY OF POTASSIUM, CALCIUM, AND MAGNESIUM ON THE ABSORPTION, TRANSLOCATION, AND ASSIMILATION OF AMMONIUM- AND NITRATE-NITROGEN IN WHEAT PLANTS

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