深耘断根对旱地高产小麦氮素分配利用及产量的影响

在大田条件下研究了深耘断根对旱地高产小麦氮素利用及产量的影响 ,结果表明 :冬前深耘断根 ,植株将吸收的氮素较多分配至籽粒 ,分配至根系少 ,肥料氮利用率高 ,土壤残留率和回收率低 ,损失率高 ,产量提高 ;而冬前和起身期都深耘断根与不断根则正好与此相反 ,因而在旱地高产麦田应推广冬前深耘断根

EFFECTS OF DEEP CULTIVATION\|ROOT CUTTING ON NITROGEN DISTRIBUTION AND UTILIZATION AND YIELD IN DRY LAND WHEAT OF HIGH YIELD

The effects of deep cultivation\|root cutting on nitrogen distribution and utilization and yield in dry land wheat have been studied in field.The results showed that the best effect obtained from 4 treatments by deep cultivation\|root cutting in before winter stage,more nitrogen absorbed was distributed in kernel and less in root system.The utilization ratio and loss ratio of fertilizer nitrogen increased,the remainder ratio in soil and recovery ratio of fertilizer nitrogen decreased,and the grain yield increased.However,the opposite effects of the deep cultivation\|root cutting was found in before winter stage and starter stage and in control.So the technology of deep cultivation\|root cutting in before winter stage should be used in dry land for high yield wheat.