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采用氮磷钾 3因素 5水平二次回归正交组合设计方法 ,对潴育型紫色水稻土、中性紫色土、酸性紫色土栽培烤烟的研究表明 ,3种土壤速效氮磷钾含量与预报产量及产值间呈较好的直线型正相关关系。土壤速效磷、钾含量与预报产量磷、钾施用量呈较好的负相关关系 ,土壤速效钾含量与预报产值施钾量呈正相关关系。磷钾施用量与最佳产量呈负相关关系 ,钾施用量与最高产值呈较好的正相关关系。 3种土壤氮磷钾养分模型预报的最佳产量、最高产值及产投比均以潴育型紫色水稻土 >中性紫色土 >酸性紫色土
The results showed that the contents of available N, P, K fertilizers in three types of soils and the predicted yield And the output value showed a good linear positive correlation. There was a good negative correlation between soil available phosphorus and potassium content and predicted phosphorus and potassium application rates. There was a positive correlation between soil available potassium and predicted potassium yield. There was a negative correlation between the amount of P and K application and the best yield, and the positive correlation between K application and the highest yield was positive. The best yield, highest output and production-to-production ratio predicted by NPK nutrient model of three kinds of soils were in the order of purple paddy soil> neutral purple soil> acid purple soil