| This research concentrates on the study of N fertilizer, N;There was no evidence of nitrogen transfer from soybean to maize under field conditions six days before anthesis, 50 after anthesis or at maturity. However under greenhouse conditions there was evidence of nitrogen transfer from soybean to ryegrass when Chippewas was used but not when Clark was used as the soybean component.;N;In 1984 under field conditions residual soil nitrogen was higher after monocrop soybean than after intercrop soybean-maize and lowest after monocrop maize. In 1985 there was no difference in the amount of residual soil nitrogen among monocrop soybean, intercrop soybean-maize and monocrop maize.;In 1984 the LER value was 1.67 when no N fertilizer was applied compared to 1.28 with the application of 150 Kg N/ha. Intercropping soybean with tall maize resulted in a higher LER (1.63) than intercropping with short maize (1.32). In 1985, soybean isolines were the only factors that had an effect on LER values. The LER value was higher (1.12) with nodulating soybean than with nonnodulating (0.91). |
