Nitrogen transfer from nodulating soybean to maize or to nonnodulating soybean in intercrops: the 15N dilution method |
| |
Authors: | R C Martin H D Voldeng D L Smith |
| |
Institution: | (1) Plant Science Department, Nova Scotia Agricultural College, Box 550, B2N 5E3 Truro, Nova Scotia, Canada;(2) Plant Research Centre, Central Experimental Farm, Agriculture Canada, K1A 0C6 Ottawa, Ontario, Canada;(3) Plant Science Department, Macdonald College of McGill University, Ste. Anne de Bellevue, H9X 1C0 Quebec, Canada |
| |
Abstract: | In 1985, 1986 and 1988, maize (Zea mays L.) was monocropped or intercropped with nodulating or nonnodulating soybean (Glycine max L.] Merr.). In addition, nodulating soybean and nonnodulating soybean were each monocropped and grown as a mixture. In 1985 and 1986, treatments were grown at 0 and 60 kg N ha–1 and in 1988, the treatments were grown without N fertilizer, on N-depeted soil and on non-N-depleted soil. 15N enriched N was applied to soil in all the aforementioned treatments to test for N transfer from nodulating soybean to non-N2-fixing crops by the 15N dilution method.The 15N dilution method did not show the occurrence of N transfer in 1985 and 1986, but the N sparing effect was evident from the total N uptake of nonnodulating soybean, dwarf maize and tall maize, in 1986. In 1988, maize and nonnodulating soybean seed yields and seed N yields were higher on non-N-depleted soil than on N-depleted soil. On N-depleted soil, the 15N dilution method indicated N transfer from nodulating soybean to maize and to nonndulating soybean. At a population ratio of 67% nodulating soybean to 33% nonnodulating soybean, N transfer was also seen on non-N-depleted soil in 1988. |
| |
Keywords: | Glycine max (L ) Merr intercropping maize N-depleted soil 15N dilution method N transfer soybean Zea mays L |
本文献已被 SpringerLink 等数据库收录! |
|