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对广东１８个不同类型水稻土的大、中、微量元素进行化验及必要的土壤吸附试验，然后对照临界值初步判别土壤各元素的丰缺状况，提出推荐施肥建议供水稻盆栽试验参考，最后确定不同类型水稻土的养分限制因子。试验结果表明，全部烘试土壤缺Ｎ，９０％缺Ｋ，７５％缺Ｐ，４５％缺Ｓ及Ｚｎ，３３％缺Ｍｏ，２８％缺Ｍｇ，１７％缺Ｃｕ、Ｍｎ、Ｂ。若不施这些元素，水稻产量（以干物量表示）将减少Ｎ３８％，Ｋ２５％，Ｐ、Ｓ、Ｚｎ、Ｍｏ均为２０％，Ｃｕ、Ｍｎ、Ｂ为１５％。按元素在增产中的作用及缺素的普遍性列出养分限制因子的顺序为Ｎ＞Ｋ＞Ｐ＞Ｚｎ＞Ｓ＞Ｍｏ＞Ｍｇ＞Ｃｕ、Ｂ、Ｚｎ。
In this paper, large, medium and trace elements of 18 paddy soils in Guangdong province were tested and the necessary soil adsorption tests were conducted. Then, the critical value of the soil was used to determine the abundance and deficiency of various elements in the soil. A fertilization recommendation for paddy rice was put forward. Finally, Nutrient Limiting Factors for Different Types of Paddy Soils. The results showed that all the soils were deficient in N, 90% lacking K, 75% lacking P, 45% lacking S and Zn, 33% lacking Mo, 28% lacking Mg, 17% lacking Cu, Mn and B. Without these elements, rice yield (expressed in dry matter) will be reduced by N38%, K25%, P, S, Zn and Mo by 20% and Cu, Mn and B by 15%. According to the role of elements in increasing production and the universality of deficient nutrients, the order of nutrient limiting factors is N> K> P> Zn> S> Mo> Mg> Cu, B and Zn.