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前言温州蜜柑栽培中,关于磷的施用效果,过去进行了不少调查研究。然而,由于施用的磷酸易被土壤固定,效果不显著,若大量施用又会发生细根受害,所以要把树体内磷酸浓度提高至一定水平以上是困难的。而且,即使能够把磷酸的浓度提高到相当水平,也未见到相应提高品质的趋势。目前对磷的肥效没有把握。本试验用非火山性的黑色沼泽土,钵栽温州蜜柑幼树,探讨磷的叶面喷布与土壤施用,对叶片中磷含量、果实的膨大及品质的影响。试验于1981～82年连续二年,进行中试材有所变更,本报告以1982年度的结果为主予以叙述。
Preface Wenzhou Satsuma cultivation, on the phosphorus application effect, in the past conducted a lot of research. However, since the phosphoric acid to be applied is easily fixed by the soil, the effect is insignificant. If the rooting occurs in a large amount, the concentration of phosphoric acid in the tree is increased to a certain level or more. Moreover, even if the concentration of phosphoric acid can be raised to a considerable level, there is no corresponding trend of improving the quality. At present, the efficiency of phosphorus is not sure. In this study, non-volcanic black swamp soil was used to grow young leaves of Satsuma mandarin, and the effects of foliar spray and soil application of phosphorus on the phosphorus content, fruit enlargement and quality of the leaves were discussed. The test was conducted for two consecutive years from 1981 to 1982 with some changes in the test material. The report mainly focuses on the results of the year 1982.