土壤养分系统研究法在乌桕幼林平衡施肥上的应用

Study on Balanced Fertilization in Young Forest of Sapium sebiferum with the Aid from Agro Services International

采用土壤养分系统研究法(ASI),对乌桕幼林土壤养分的丰缺情况进行评价,结合乌桕的营养需求特性,开展养分不同用量配比处理试验。结果表明:最佳养分处理N(氮)-P2O5(五氧化二磷)-K2O(氧化钾)为75∶55∶60 kg·hm-2能显著促进乌桕树高、地径和冠幅的生长,该配方适宜于乌桕幼林施用。同时,土壤N、K是影响乌桕幼林粗生长和高生长最主要的养分因子,而N、P、K则共同影响其冠幅的增长量。

By the method of soil nutrient state system study,soil nutrient situation of the land on which young forest of Sapium sebiferum grew was analyzed and evaluated.Combined with nutritional requirement characteristics of tallow,the optimum nutrient treatment with N-P2O5-K2O（75∶55∶60 kg·hm^-2）had been done.The result indicated that the growth traits of S.sebiferumincluding tree height,ground diameter and crown breadth were evidently enhanced by the treatment,so the formula was suitable for young forest of S.sebiferum growth.It＇s also found that the major factors affecting the diameter growth and height growth of the young forest were N and K respectively.And the crown growth of young forest of S.sebiferum was affected by all of N,P and K.