Study on the Fixation of Sampling Date for Nutritional Diagnosis (N, P, K) of Walnut / 核桃树体N、P、K营养元素诊断中采叶时间的确定
Study on the nutritional indices of three essential elements (N, P, K) of walnut was conducted in Qi County, Shanxi Province from 1986 to 1990. According to the study, the best leaf samples for nutritional diagnosis should be taken, in mid May because the leaves have reached physiological maturity a...
Saved in:
| Published in | Forest research (Beijing) Vol. 4; no. 5; p. 578 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
Beijing
Chinese Academy of Forestry
01.01.1991
|
| Online Access | Get full text |
Cover
Loading…
| Summary: | Study on the nutritional indices of three essential elements (N, P, K) of walnut was conducted in Qi County, Shanxi Province from 1986 to 1990. According to the study, the best leaf samples for nutritional diagnosis should be taken, in mid May because the leaves have reached physiological maturity at this time. The analysis of these samples is sure to give the best indices and show the yield of the trees. 树体营养指标的确定是通过叶分析来实现的.对此,有关学者认为一个至关重要的问题是采叶时间.叶分析的结果能否用于树体营养诊断,在很大程度上是由取样时间、部位所决定的[1].因为叶片中营养元素含量在年周期中变化很大[2].关于采叶的最佳时间众说不一,美国有人提出在盛花后6～8周采样[1],还有人提出在7～8月初[1].在我国一般在年生长稳定时期即7、8月采叶来确定树体营养元素的含量,一致认为要采生理成熟的叶子[1, |
|---|---|
| ISSN: | 1001-1498 |