滨海区水稻产量与磷肥效率模型的建立

通过分析盘锦地区磷肥的施用情况,研究了土壤高、中、低肥力的田块磷肥的施用效果以及肥料利用的情况,对水田土壤磷肥的供应能力建立了不同的分级指标,探讨了水稻磷肥最适宜的施用量,最后建立了滨海区水稻产量与磷肥效率的模型。主要研究结果如下:将土壤供磷能力分为5个级别,高地力地区推荐最佳施肥量为75~85 kg/hm^2,中地力区域最佳施肥量为81~90 kg/hm^2,低地力区域最佳施肥量为85~95 kg/hm^2,高、中、低地力田块水稻最佳经济施磷量为82.5 kg/hm^2、81.8 kg/hm^2和82.2 kg/hm^2。高地力区域产量效应模型为y=-0.0301x^2+6.1689x+11003.5,R^2=0.5207;中地力区域产量效应模型为y=-0.0312x^2+6.3026x+10941.27,R^2=0.626;低地力区域产量效应模型为y=-0.0311x^2+6.3111x+10920.2,R^2=0.6697。产量肥效模型归结为y=ax^2+bx+c形式,其中b为植株对土壤磷肥的需求程度,c为不施肥情况下的产量,可见土壤肥力越高,产量越高。如果想要提高磷肥的极限利用率,则可以增加有机肥来达到目的。

Establishment of Rice Yield and Phosphate Fertilizer Efficiency Model in Coastal Area

The paper analyzed the application of phosphate fertilizer in Panjin,studied the application effect of phosphate fertilizer and fertilizer utilization in high,medium,and low fertility fields,set up different grading indexes for the supply capacity of soil phosphorus fertilizer in paddy field,discussed the optimum application amount of rice phosphate fertilizer,established a model of rice yield and phosphate fertilizer efficiency in coastal areas.The main findings are as follows:The phosphorus capability of the soil is divided into 5 stages,the optimal fertilizer application was 75-85 kg/hm^2,81-90 kg/hm^2 and 81-90 kg/hm^2 in the high,medium,and low filed plots,the most economical phosphorus application amount of rice was 82.5 kg/hm^2,81.8 kg/hm^2 and 82.2 kg/hm^2 in high,middle and low field plots.The yield effect model was y=-0.0301x^2+6.1689x+11003.5,R^2=0.5207,y=-0.0312x^2+6.3026x+10941.27,R^2=0.626,and y=-0.0311x^2+6.3111x+10920.2,R^2=0.6697 in the high,medium,and low filed plots.The relationship between yield and fertility was reduced to y=ax^2+bx+c,the b is the degree of plant demand for soil phosphorus fertilizer,and c is the yield without fertilization.The higher the soil,the higher the output.If you want to increase the limit utilization rate of phosphate fertilizer,you can increase the organic fertilizer to achieve the goal.