广东省花生测土配方施肥钾素指标体系研究

为指导当地花生施肥，广东省在2008—2013年开展了花生“3414”田间肥效试验研究花生施肥效应及对产量的影响。根据肥效试验结果进行统计分析，建立了广东省花生种植土壤速效钾丰缺指标的数学模型：y=15.486lnx+19.745，r=0.701**；土壤速效钾含量与推荐施钾(K2O)量的数学模型y=-0.6357x+ 155.24，r=-0.531**。根据数学模型确定土壤速效钾丰缺范围分为＜20 mg/kg、20~35 mg/kg、35~70 mg/kg、70~130 mg/kg、>130 mg/kg 5个等级，对应的每公顷推荐施钾(K2O)量为142.5 kg、135.0~142.5 kg、112.5~ 135.0 kg、75.0~112.5 kg和75.0 kg。

Research of Potassium in Formula Fertilization by Soil Testing Index System for Peanut in Guangdong

This article discussed the fertilizer response in 3414 fertilizer experiments on peanut in Guangdong Province in recent years. The index system of soil available potassium abundance of Guangdong peanut was established by analyzing the relative yield. Results showed that, the equation for soil available potassium content was y =15.486lnx 19.745 (r =0.701); the equation of the recommended potassium content was y =- 0.6357x 155.24 (r =-0.531). According to the mathematical model the sufficiency and deficiency range of the soil available potassium were divided into 5 levels: <20 mg/kg, 20-35 mg/kg, 35-70 mg/kg, 70-130 mg/kg and >130 mg/kg, and the proposed index of potassium application were 142.5 kg/hm2, 135.0-142.5 kg/hm2, 112.5-135.0 kg/hm2, 75.0-112.5 kg/hm2 and 75.0 kg/hm2, respectively.