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通过田间调查、田间试验和室内分析,研究了辽宁省不同类型水田土壤的硅素肥力状况,结果表明,醋酸-醋酸钠(pH4)缓冲液法测定的辽宁省水田土壤的有效硅含量不能准确反映土壤的供硅能力,淹水培养法的测定过程同水稻的生长过程相似,测定出的水浸态硅含量同硅肥的增产效果密切相关,因此,这种方法的测定结果可以用于评价水田土壤的供硅能力;田间试验结果表明,合理施用硅肥可提高水稻的产量,增产幅度和水浸态硅含量的关系可用CateandNelsen校验曲线进行描述;通过该曲线初步确定的辽宁省硅素丰缺的临界标准为水浸态硅含量80mg/kg;根据初步确定的临界标准,辽宁省绝大多数的水田土壤硅素缺乏,合理施用硅肥将成为辽宁省水稻产量提高的重要措施之一。
Field investigation, field experiment and laboratory analysis were conducted to study the fertility of silicon in different types of paddy soils in Liaoning Province. The results showed that the effective silicon content of paddy soils in Liaoning Province measured by the buffer solution of acetic acid - sodium acetate (pH4) can not accurately reflect the soil , The determination of flooding culture is similar to that of rice. The measured content of silicon in the flooding state is closely related to the yield increase of silicon fertilizers. Therefore, the determination results of this method can be used to evaluate paddy soil The results of field experiments showed that the rational application of silicon fertilizer could increase the yield of rice, and the relationship between yield increase rate and the content of silicon in the water-immersion state could be described by Cate and Nelsen calibration curve. The critical criterion is the silicon content of 80 mg / kg. According to the initial critical criteria, the silicon deficiency in paddy soils in most of Liaoning Province is lacking. The rational application of silicon fertilizers will be one of the important measures to increase rice yield in Liaoning Province.