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应用临界值浓度法、DRIS图解法和指数法等叶片营养诊断分析方法,研究了元谋干热河谷地区的实生印楝人工林产量和品质与叶片养分含量之间的关系。结果表明:6月份所采集的印楝叶片其养分含量与印楝产量之间存在显著线性相关;获得印楝高产的叶片全N、全P和全K的临界值分别为15.09、1.22和7.68g·kg-1,相应的最适范围分别为15.09～22.68、1.22～1.59和7.68～9.17g·kg-1;低产印楝人工林的叶片养分的DRIS图解法和DRIS指数法诊断结果基本一致,它们对N、P、K的需求次序均为P>N>K,并且这一结果与当地土壤本底肥分检测结果相印证。此外,叶片养分含量与印楝素含量之间不存在相关性,可能与印楝素本身的遗传因素有关,故不能在印楝实生群体中采用叶片营养诊断技术来进行种仁印楝素含量的诊断分析。
The relationship between yield and quality of real Neem plantation and leaf nutrient content in Yuanmou dry-hot valley was studied by means of the diagnostic methods of leaf nutrition such as critical concentration method, DRIS method and index method. The results showed that there was a significant linear correlation between the nutrient content of neem leaves and the yield of neem collected in June. The critical values of total N, total P and total K for obtaining high yield of Neem were 15.09, 1.22 and 7.68g · Kg-1, and the corresponding optimum range was 15.09 ~ 22.68, 1.22 ~ 1.59 and 7.68 ~ 9.17g · kg-1, respectively. The results of DRIS method and DRIS method were the same for low- The order of their demand for N, P and K is P> N> K, and this result is confirmed by the results of local soil fertility test. In addition, there is no correlation between the leaf nutrient content and azadirachtin content, which may be related to the genetic factors of azadirachtin itself, so it can not be used in the neem population to diagnose azadirachtin Diagnostic analysis.