THE EFFECTS OF SOIL AND FERTILIZER NITROGEN AND MOISTURE STRESS ON YIELD, OIL AND PROTEIN CONTENT OF RAPE

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Abstract
Rape yields were increased nearly fourfold by the combination of irrigation and fertilizer N for eight site-years in which average soil NO3-N to 60 cm was 34 kg/ha. The increase due to irrigation and fertilizer N in combination was more than double the increase due to the two factors applied separately. Irrigation increased the oil and reduced the protein content of rape. In irrigation experiments, soil NO3-N plus fertilizer N was positively correlated with yield and protein content and highly negatively correlated with oil content. The separation of irrigation experiments into three soil NO3-N categories showed significant differences in yield, oil and protein response to N for some of the categories. However, these data showed that soil test categories based on increments of less than 30 kg/ha of NO3-N to 60 cm are of doubtful practical significance.

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