小麦玉米带田一种作物施用氮肥对配对作物氮营养的影响

EFFECT OF NITROGEN FERTILIZER APPLIED TO ONE CROP ON THE NITROGEN NUTRITION OF THE OTHER IN WHEAT-CORN BAND INTERPLANTING

用^(15)N标记研究小麦玉米带田施给小麦或玉米的氮肥对配对作物氮营养的影响,结果发现:施给小麦的氮肥,小麦利用了52.0%,玉米利用了3.8%;施给玉米的氮肥,玉米利用了38.3%～55.8%,小麦利用了6.9%～10.8%。试验还证明,吸收玉米氮肥最多的是与玉米相邻的第1行小麦,其他行吸收极少。说明生长季节内氮肥在供试土壤中的横向移动距离(单向)尚未超过小麦行距的2倍(约30cm)。

This study was conducted to determine effect of nitrogen fertilizer applied to one crop on the nitrogen nutrition of the other in wheat-corn band interplanting. Result of a microplot field experiment using (15)~N labelled urea showed that the fertilizer N applied to wheat was utilized 52.0% by wheat and 3.8% by corn;the fertilizer N applied to corn was utilized 38.3%～55.8% by corn and 6.9%～10.8% by wheat. In 5 rows of wheat, the one which is the most close to corn utilized fertilizer N applied to corn much more than that utilized by the others. The same is true for rows of corn. Apparently, uptaking fertilizer N from corn rows by wheat was more strongly than from wheat rows by corn. In addition,these results suggested that the fertilizer N level movement distance was less than 2 row spacings of wheat in the first planting season.