福建柑桔主栽品种叶片矿质营养成分的研究

我省柑桔主产区的柑桔主栽品种叶片营养成分分析结果表明:1.我省柑园缺锌现象较普遍。据对芦柑等63片果园进行叶片分析,其中有26片果园叶样含锌量在25ppm 以下,占41.27%。其他果园叶样含锌量也多处于“适量”的下限。开花前喷布0.1%硫酸锌,叶片含锌量可提高13～130%,但喷锌后会引起叶片中其他营养元素含量的变化,铁、镁、锰、钙含量均呈不同程度降低。2.我省山地柑园缺镁症亦较常见,有60%左右叶样含镁量低于0.30%。叶片含钙量亦多在3.0%以下。3.我省柑园柑桔叶片含锰量多属正常,铁、铜含量偏高,但未见有不良影响。

INVESTIGATIONS ON SOME MINERAL NUTRIENTS FOUND IN THE LEAF OF PRINCIPAL CITRUS VARIETIES GROWN IN THE FUJIAN PROVINCE

The results of leaf mineral nutrient composition analysis of the principal citrus varieties cultivated in Fujian were presented in the following: 1.Zinc deficiency was very widely spread.According to our investigations of 63 ponkan orchards,26 of them making up 41.37% of the orchards developed leaf zinc content lower than 25 ppm Spraying with 0.1% of zinc sulphate before blossom stage would raise the zinc level up to 13-130%;but with antagonism of other elements,the contents of Fe,Mg, Mn,and Ca,etc,all reduced to varying degrees. 2.Magnesium deficiency was commonly occurred in the mountainous orchards.About 60% of the leaf samples contained Mg lower than 0.30%. The Ca content was lower than 3.0%. 3.In most of the mountainous and hilly citrus orchards,the content of Mn in the leaf was found normal,while both Fe and Cu showed rather high amounts but with no undesirable effects.