山楂叶片营养诊断技术的研究

 通过田间试验和山楂叶分析表明，山楂叶片营养元素含量与产量之间密切相关，采用叶分析作为山楂营养诊断是可行的，采样部位以枝条顶端下数第3片叶为宜，采样时期以8月10-20日为好，不同品种、不同修剪程度叶片中营养元素含量是不同的，所以应有不同的诊断标准。

A STUDY OF THE TECHNIQUE ON THE HAWTHORN LEAF NUTRITIONAL DIAGNOSIS

With the field experiments and the analysis of hawthorn leaves, it has been shown that the contents of certain nutritional elements in leaves are in relation to the output of the hawthorn. And the contents of N.K are in direct proportion to the output of the hawthorn, but the content of Mn is in inverse proportion to the output of the hawthorn. So, we can use this method to diagnose the hawthorn nutrition by analysing its leaves. Analysing leaves also shows that different hawthorn species and the extent of pruning make different contents of nutritional elements in the leaves. Therefore we should have different diagnostic standard. Since the contents of nutritional elements are irregular and different from top-leaf and bottom-leaf on the same branch in the same output class, the most suitable leaf diagnosed is the second or thrid leaf from the top, because its content is stable and the leaf area is larger. The most suitable period to pick up samples is from August 10th to 20th, the nutritional contents in the eaves is more stable during this period than at any other periods.