INTERSPECIFIC DIFFERENCES IN SODIUM ACCUMULATION AND REQUIREMENT AMONG FORAGE CROPS

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Twenty species of forage crops including 9 varieties of Rhodes grass were grown in the same nutrient solution containing 0.5mM Na for 2 weeks. Shoot Na concentration varied from less than 0.02% (sorghum, maize, and Sudan grass) to 1.07% (Kabulabula grass). The shoot/root ratio of Na concentration exceeded one in Rhodes grass, green panic, finger grass, Kabulabula grass, and Makarikari grass. The varietal differences in shoot Na concentration were much smaller than the interspecific differences. Ten species of grasses differing in their shoot Na content were grown in the nutrient solution with 0, 0.05, 0.1, 1, 10, or 40 ppm of Na for 4 weeks. Dry weight of Makarikari grass, Coloured guineagrass, fall panic, Kabulabula grass, Rhodes grass, and Japanese millet remarkably increased with increasing Na concentration in the medium. On the other hand, sorghum did not appear to respond to Na. The foliar Na concentration of which the maximum dry weight was obtained varied as follows : Japanese millet, 0.013%; fall panic, 0.15%; Coloured guineagrass, 0.32%; Rhodes grass, 0.32%; Makarikari grass, 1.02%; and Kabulabula grass, 2.33%. These data indicate that there are considerable interspecific differences in the degree of Na requirement among C_4-plants. The ability to accumulate Na in shoots was ranked in the following order : Kabulabula grass and Rhodes grass, high; green panic and Makarikari grass, intermediate; Coloured guineagrass, Guineagras s, Japanese millet, fall panic, and African millet, low; and sorghum, very low.
社団法人日本土壌肥料学会の論文

INTERSPECIFIC DIFFERENCES IN SODIUM ACCUMULATION AND REQUIREMENT AMONG FORAGE CROPS

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