在设施农业条件下缓释肥养分释放与土壤水分状况之间的关系

Relationship between Slow-release Fertilizer and Soil Water Content in the Facilities Agricultural Conditions

[目的]探索缓释肥在设施农业条件下养分释放与土壤水分状况之间的关系。[方法]通过控制土壤水分含量,定期检测缓释肥肥效的释放速度。[结果]缓释肥养分的释放受土壤相对含水量的影响,风干土样的有效氮含量由最初的28.80 mg/kg增加到试验结束时的43.08 mg/kg,而土壤相对含水量为100%的土样中的有效氮含量由最初的36.90 mg/kg增加到试验结束时的249.58 mg/kg,但有效磷和速效钾的释放量随含水量的增加效果不如有效氮显著。[结论]随着土壤相对含水量的升高,缓释肥的养分释放速度提高。

[Objective] To explore the relationship of slow-release fertilizer conditions of nutrient release and soil water condition in agricultural facilities.[Method] Through the control of moisture content in soil,periodic inspection of slow-release fertilizer release rate was carried out.[Result]The results showed that soil relative water content affected slow-release fertilizer.The available nitrogen content of dried soil sample increased form 28.80 mg/kg to 43.08 mg/kg.In soil sample with 100% water relative content,the available nitrogen increased from 36.90 mg/kg to 249.58 mg/kg,while the release rate of available phosphorus and available potassium along with the soil water content are not significant as available nitrogen.[Conclusion] Along with the relative soil water content growth,slow-release fertilizer nutrient release rate increased.