Research On Rice Fertilizer Efficiency Model And Recommended Fertilizer Rate In Pu’an County Based On 3414 Experiment

Rice is the main food crop in Pu’an County,Guizhou Province,and plays an important role in agricultural production.Soil testing and formula fertilization are important measures to improve fertilizer utilization,achieve zero growth of chemical fertilizers,and achieve high yield and high efficiency of rice.In this study,through the“3414”experiments of multi-point field nitrogen,phosphorus and potassium fertilizers,to find out the relationship between rice yield and fertilizer application in Pu’an County,simulate the quadratic regression equation of nitrogen,phosphorus,and potassium fertilizers and yield,and calculate the recommended nitrogen,phosphorus,and potassium fertilizers.The application rate provides an important reference for the rational fertilization of rice planting in Pu’an County and the improvement of nitrogen,phosphorus and potassium fertilizer utilization.The specific results are as follows:（1）The basic fertility and yield of the five test sites are quite different.Among them,the two test sites in Hebian Village,Woyan Township are higher,and the values of I and II in Hebian Village,Woyan Township are 588.30 kg/667m²and 516.60kg/667m²,respectively.Followed by Hongqi Village of Longyin Town and Fanjiazhai Village of Qingshan Town,which were 383.55 kg/667m²and 320.20 kg/667m²respectively.The basic fertility yield of Ximi Village,Xindian Township was the lowest,which was 193.80 kg/667m².（2）The treatments with the highest grain yield in the 5 experimental sites were not the same.The treatments of N₂P₂K₃,N₂P₃K₂,and N₁P₂K₂had the highest yields in Xindian Township Ximi Village,Woyan Township Hebian Village I and Qingshan Township Fanjiazhai Village,respectively,and the corresponding yields were respectively were 623.65 kg/667m²,664.85 kg/667m²,and 506.9 kg/667m²;both Hongqi Village,Longyin Town and Hebian Village II,Woyan Township had the highest yields treated with N₃P₂K_2,corresponding to 600.35 kg/667m²and 663.30kg/667m²,respectively.（3）The relative yields of nitrogen,phosphorus and potassium elements（relative to the yields of N₂P₂K₂treatment）were 39.35%、82.19%and 99.03%in Xindian Township,and 81.82%、72.73%and 84.85%in Hongqi Village,Longyin Town,respectively.Woyan Township Hebian Village I was 91.15%、102.27%and 97.07%;respectively,Woyan Township Hebian Village II was 88.22%、93.94%and 97.45%respectively,Qingshan Town Fanjiazhai Village was85.29%、102.94%and 101.70%.（4）According to the"3414"field plot test results,the single-factor fertilization of nitrogen,phosphorus and potassium elements and the yield and fertilization benefit of the 5 experimental sites were obtained.Township Ximi Village 11.49 kg N/667m²and 6.61 kg P₂O₅/667m²,Hongqi Village,Longyin Town6.51 kg P₂O₅/667m²,Woyan Township Hebian Village I 14.13 kg N/667m²,9.36 kg K₂O/667m²,Woyan Township Riverside Village II 12.34 kg N/667m²,6.99 kg P₂O₅/667m²,8.24 kg K₂O/667m²,and Fanjiazhai Village,Qingshan Town,7.93 kg N/667m².According to the effect equation of fertilization benefit,the highest fertilization benefit was calculated as follows:Village 11.14 kg N/667m²and 6.09 kg P₂O₅/667m²,Hongqi Village,Longyin Town 6.20 kg P₂O₅/667m²,Woyan Township Hebian Village I 10.38 kg N/667m²,6.51 kg K₂O/667m²,Woyan Township Hebian Village II 9.87 kg N/667m²,5.67 kg P₂O₅/667m²,2.94 kg K₂O/667m²,and 7.24 kg N/667m²in Fanjiazhai Village,Qingshan Town.Because the coefficients of the quadratic terms of some regression equations are positive or the calculated results do not conform to the actual situation,the recommended dosage needs to be further studied.