油桐氮磷钾营养诊断

Nutritional Diagnosis of NPK in Tung Oil Tree Leaves

1989～1990年,在金华地区利用叶分析方法对油桐进行了氮、磷、钾三元素的营养诊断试验。结果表明:叶片中氮、磷、钾的含量与施肥量之间,油桐桐果产量与叶片中氮、磷、钾的含量之间存在着显著的回归关系。它们的相关系数分别为0.8461,0.7576,0.8313和0.5209,0.4767,0.5259.本文还给出了叶片中氮、磷、钾含量的临界水平值。

In the years 1989-1990, a trial of nutritional diagnosis of tung oil tree was conducted in Jinhua County with the result that significant regression relationships existed between the content of nitrogen, phosphorus, potassium in leaves and the amounts of fertilizers applied as well as between the fruit yield of tung oil tree and the content of nitrogen, phosphorus, potassium in leaves, the regression coefficients of which were 0.8461, 0.7576, 0.8313 as well as 0.5209, 0.4767, 0.5259 respectively, so that diagnosis could be done that whether the tung oil tree has sufficient nutrients according to the content of nitrogen, phosphorus and potassium in leaves and a base for applying fertilizers reasonably could be provided. In the article, the critical level values for the content of nitrogen, phosphorus and potassium in some leaves were given.