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近年来在采用其它营养诊断法的同时,也广泛采用叶片诊断法。法国、黎巴嫩、葡萄牙、意大利、西班牙,希腊等国的许多研究者们,已做了不少有关利用叶片诊断法确定脐橙对矿质营养需要的研究。美国加州的研究者曾确定,脐橙叶片中N、P的含量变幅分别为0.9～2.6%和0.071～0.292%。黎巴嫩Fahmy和Nasrallan二氏指出,脐橙P饥饿的指标是0.108%。根据一些作者的资料,叶片中K的含量变幅为1.5～0.1%;另一些作者的资料则表
In recent years, while using other nutrition diagnosis method, also widely used leaf diagnosis method. Many researchers in France, Lebanon, Portugal, Italy, Spain, Greece and other countries have done a lot of research on the use of leaf diagnosis to determine the nutritional needs of navel oranges. Researchers in California, USA, have determined that the N, P content of navel orange leaves varies from 0.9 to 2.6% and from 0.071 to 0.292%, respectively. Lebanon Fahmy and Nasrallan II pointed out that the indicator of navel orange P starvation is 0.108%. According to some authors ’information, the content of K in leaves is varied by 1.5 ~ 0.1%; other authors’