摘要
本文探讨了各种N源在水稻植株各器官上的分布情况,指出这是由于不同土壤和肥料之间供N特性的不同,土壤氮和肥料氮在不同时期以不同强度和速度交错进入植株“库”重新分配的结局。以稻谷N%dff(或dfs)值对稻草N%dff(或dfs)值的比率表示各种N“源”对稻谷N的贡献大小,结合肥料N在农田土壤生态系统中的平衡帐,评价施肥技术具有实际意义。施肥提高了植株对土壤氮的吸收量,改变原来的土壤供氮特性起了均衡增产的作用;然而“激发效应”也可能增加土壤氮的气态损失。
The partitioning of N from various sources within different parts of rice plant was studied.The result indicates the different N-supply characteristics of soils and fertilizers and the redistribution of soil and fertilizer-N,which went into the plant“pool”in different times with different speed and intensity.The evaluation of ferrilizing techniques are of practical mearling when the ratio of grain N%dff(or dfs) values to straw dff/dfs values which show the magnitude of contribution from different N sources to the rice grain,and the fertilizer N balalice in the agricultural ecology were concerned.Fertilization increases both soil-N up-take and crop yield by changing the soil N supply characteristics.However,the “priming effect”may augment the soil N loss through v olatilization.
出处
《土壤学报》
CAS
CSCD
北大核心
1991年第2期161-167,共7页
Acta Pedologica Sinica
