【摘要】 利用河南省测土配方施肥2005—2008年豫北地区95个冬小麦"3414"试验,分别以相对产量<80%,80%～85%,85%～90%和>90%为标准,将豫北地区土壤速效磷、速效钾划分为"极低"、"低"、"中"和"高"4个等级;并用三元二次和一元二次模型分别对不同土壤养分分级范围内施肥量和产量的关系进行模拟,计算最佳施肥量.结果表明,当豫北地区土壤有效磷(Olsen-P)处于"极低"(<8 mg/kg)、"低"(8～17 mg/kg)、"中"(17～36 mg/kg)和"高"(>36 mg/kg)时,推荐磷肥(P2O5)用量分别为125～145,95～125,55～95和0～55 kg/hm2;速效钾(NH4OAc-K)含量处于"极低"(<50 mg/kg)、"低"(50~78 mg/kg)、"中"(78~122 mg/kg)和"高"(>122 mg/kg)时,推荐钾肥(K2O)用量分别为120～140,85～120,60～85和0～60 kg/hm2.更多还原

【Abstract】 In order to guide wheat fertilizer application for Henan Province,data based on 95 field experiments of National Soil-Testing and Fertilizer Recommendation Program in Henan Province from 2005 to 2009 were analyzed.Soil available P,K in northern regions of Henan Province were classified for four levels(very low,low,medium,and high) according to wheat relative yield(<80%,80%～85%,85%～90%,≥90%).Ternary quadratic,linear equation model were used to calculate optimum fertilizing amount and maximum yield fertilizing amount,respectively.The results showed that when soil available P,K content in northern regions of Henan Province is on very low grade(Olsen-P<8 mg/kg,NH4OAc-K<50 mg/kg),the recommended P,K fertilizer amount are 125~145 and 120~140 kg/hm2;on low grade(Olsen-P 8~17 mg/kg,NH4OAc-K 50~78 mg/kg),the P,K fertilizing amount are 95~125 and 85~120 kg/hm2;on medium grade(Olsen-P 17~36 mg/kg,NH4OAc-K 78~122 mg/kg),the P,K fertilizing amount are 55~95 and 60~85 kg/hm2;on high grade(Olsen-P>36 mg/kg,NH4OAc-K>122 mg/kg),the P,K fertilizing amount are 0～55 and 0～60 kg/hm2.更多还原