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以3年生初结果的鸭梨/杜梨为试材,用~(15)N示踪技术探讨了秋施、春施及夏施肥料氮在土壤-植物中的平衡及其效应。结果表明,肥料氮损失量与植株吸收量之比表现为夏施>秋施>春施;肥料氮利用率以春施最高,秋施次之,夏施最低。肥料氮在植株体内的分配基本上随生长中心的转移而转移,无果中、短枝有优先累积肥料氮的效应。以秋施肥料氮的分配与植株生长节奏最吻合,并能刺激生长势弱的植株吸收利用肥料氮。显示出秋施氮对植株的效应最好。
The results of perennial pears and pears of three-year-old were used as test materials, and the effects of autumn, spring and summer fertilizers on soil-plant balance and their effects were discussed by using tracing techniques of ~ (15) N. The results showed that the ratio of fertilizer nitrogen loss and plant uptake showed that summer application> autumn application> spring application. Fertilizer nitrogen utilization rate was the highest in spring, followed by autumn and lowest in summer. Fertilizer nitrogen in the distribution of the plant basically with the transfer of the growth center of the transfer, no fruit, short branches have the preferential accumulation of fertilizer nitrogen effect. Nitrogen fertilizer to fall fertilizer distribution and plant growth rhythm most consistent, and can stimulate the growth of weak plants absorb fertilizer nitrogen. The effect of autumn nitrogen application on plants was best.