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成用土壤常规分析,吸附试验和指示作物盆栽相结合的诊断程序,以高粱为栽种作物对土壤的养分障碍因子进行系统诊断。结果表明:供试的青紫泥田土壤养分缺乏的顺序依次为P>N>K>S,微量元素相对充裕;黄筋泥田土壤的主要限制因子为活性酸,当土壤中施入适量CaCO_3后,各养分元素的亏缺顺序表现为P>N>K>Mo>Zn;小粉土主要缺N、P和K,缺Mg的减产效应与缺K接近,微量元素Mn和Zn也在一定程度上显示不足。应用系统诊断程序,可快速、准确地监测土壤中作物养分限制因子的存在和相对亏缺顺序,为建立高效益的肥料田间试验和作物高产研究提供依据。
In order to systematically diagnose soil nutrient obstacle factors by soil routine analysis, adsorption test and the combination of the indicated crop pots, the sorghum crop was used as the planting crop. The results showed that the order of soil nutrient deficient in Qing purple soil was P> N> K> S, and the relative abundance of trace elements was the main limiting factor of soil in yellow gluten soil. When CaCO3 was applied in the soil, The order of deficit of nutrient elements was P> N> K> Mo> Zn. The main deficiencies of N, P and K in small silt were close to those of deficient K, and trace elements Mn and Zn were also shown to a certain extent insufficient. The application of system diagnostic program can quickly and accurately monitor the existence of crop nutrient limitation factors and relative order of deficiency in soil so as to provide basis for establishing high-efficiency fertilizer field experiment and crop high yield research.