Study on Fertility Conversion Rate of Two Common Fertilizers Under Potato Planting Conditions
To determine the conversion time of two fertilizers in soil,so as to determine the nutrient supply time and ability,and provide data support for determining the scientific fertilization time.[Method]In this experiment,two fertilizers commonly used in potato produc-tion were used as treatment,namely potassium sulfate and diammonium phosphate. Three soil moisture treatments were set,respectively 25％, 35％ and 45％.Sampling time was set and fertilizer residual amount and fertilizer dissolution amount and dissolution rate were determined.[Re-sult] The dissolved amounts of diammonium phosphate and potassium sulfate exceeded or approached 50％ on the 5th and 56th day after fertili-zation,respectively,and could be labeled as the best nutrient absorption period. After the application of diammonium phosphate for 21 days,the fertilizer did not transform. On the whole,with the increase of soil moisture content,the dissolution capacity of diammonium phosphate was en-hanced,and the nutrient supply capacity was increased,but the sustainable support capacity was weakened. The release of potassium sulfate nu-trient was relatively average during the experiment period. Under the conditions of 25％ and 35％ soil water content,the nutrient supply period was efficient within 28 days after fertilization,and the nutrient supply tended to be stable after 28 days. Under the condition of 45％ soil mois-ture content,the nutrient efficient supply period was within 49 days after fertilization. On the whole,45％ water content is more conducive to prolonging the effective feeding time of potassium sulfate. [ Conclusion] The solubility of diammonium phosphate and potassium sulfate can be used as the index of nutrient supply of fertilizer,but it can only be applied to mineral element fertilizers. Because organic fertilizers also involve mineralization process after dissolution,it has no guiding significance for organic fertilizers.
万方数据
维普
