水稻大配方小调整中氮素指标体系重构研究

Study on Reconstruction of Nitrogen Index System in Minor Adjustment of Rice Large Formula

将土壤碱解氮与施用的氮素合并为土壤速效氮,并依据配方施肥稻谷产量计算得出土壤速效氮利用率;利用大配方“3414”试验得到的函数公式计算得出无氮肥产量;依据测土配方施肥目标产量法计算得出施氮量,并建立了土壤碱解氮与氮素施用量的函数关系式。结果表明:土壤碱解氮平均含量为(103.30±13.67)mg/kg,配方施肥稻谷平均产量为(6040.65±70.62)kg/hm^(2),土壤速效氮利用率为(34.22±2.26)%,无肥区平均产量为(4939.50±228.89)kg/hm^(2);土壤碱解氮与施氮量的函数公式为:y=-0.7145x+151.71,R^(2)=0.9539,调整配方后平均施氮量为(77.9±10.0)kg/hm^(2)。研究表明,利用生产与试验相结合的方法重构配方氮素指标体系,能够实现生产大配方的快速、便捷调整。

The soil available nitrogen was combined with the applied nitrogen,and the utilization rate of soil available nitrogen was calculated according to the rice yield of formula fertilization.The function formula obtained from the“3414”experiment of the large formula was used to calculate the nitrogen free yield.The amount of nitrogen application was calculated according to the target yield method of soil testing and formula fertilization,and the functional relationship between soil alkali hydrolyzable nitrogen and nitrogen application was established.The results showed that the average content of soil alkali hydrolyzable nitrogen was(103.30±13.67)mg/kg.The average yield of rice with formula fertilization was(6040.65±70.62)kg/hm^(2).The utilization rate of soil available nitrogen was(34.22±2.26)%,and the average yield of non fertilizer area was(4939.50±228.89)kg/hm^(2).Function formula of soil alkaline hydrolysis and nitrogen application rate was y=-0.7145x+151.71,R^(2)=0.9539,and the average nitrogen application rate of the adjusted formula was(77.9±10.0)kg/hm^(2).The adjustment of production formula could be rapidly and conveniently realized by combining production and experiment to reconstruct the nitrogen index system of formula.