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›› 1991, Vol. 27 ›› Issue (6): 652-657.

• 研究简报 • 上一篇    下一篇

核桃叶片N、P、K元素营养诊断指标的研究

赵明范   

  1. 中国林业科学研究院林业研究所
  • 收稿日期:1990-08-07 修回日期:1900-01-01 出版日期:1991-11-25 发布日期:1991-11-25

STUDY ON INDICES OF NUTRIENT DIAGNOSIS OF N, P, K ELEMENTS IN LEAVES OF WALNUT

Zhao Mingfan   

  1. Research Institute of Forestry, CAF
  • Received:1990-08-07 Revised:1900-01-01 Online:1991-11-25 Published:1991-11-25

关键词: 核桃, N, P, K元素, 营养指标

Abstract: The indices of nutrient diagnosis of N, P, K elements in leaves of walnut tree grown in Qi county, Shan Xi Province were studied from 1985—1990. The results indicate that actording to the nutrient element contents of leaves, the nutrient indices are as follows: For nitrogen, optimum content is 3.82—4.76%, latent deficient content 3.06—3.76%, severe deficient content<3.06%, for potassium they are 2.59—2.61%, 1.94—2.49%,<1.94% respectively, for phosphorous optimum content 0.21—0.24%, deficient content<0.19%, luxurious content>0.24%. Therefore, the annual optimum requirements for N, P, K each tree growning in this experimental site are 0.75kg, 2.5kg and 0.25kg respectively.

Key words: Walnut, N, P, K elements, Nutrient indices