摘要
为了系统研究豫南稻区土壤磷素丰缺指标及施磷推荐,多年来在豫南稻区布置水稻肥效田间试验,并用ASI法对基础土壤样品进行测试分析,以缺磷素区（NK）与推荐施肥区（NPK）水稻相对产量〈55%、55%-68%、68%-78%、78%-95%和〉95%为标准,分别将对应的土壤有效磷分成“极低”、“低”、“中”、“较高”和“高”5级. 结果显示：豫南稻区水稻运用ASI法测定的土壤有效磷含量分别与不施磷小区水稻相对产量呈显著正相关关系,并且得出豫南稻区土壤有效磷“极低”指标为〈7.5 mg/L,“低”指标为7.5-13.5 mg/L,“中”指标为13.5-17.5 mg/L,“较高”指标为17.5-35.5 mg/L,“高”指标为〉35.5 mg/L. 据此建立的豫南稻田土壤养分丰缺指标推荐施磷量为：速效磷含量为〈7.5 mg/L、7.5-13.5 mg/L、13.5-17.5 mg/L和17.5-35.5 mg/L时,磷肥推荐施用量分别为135、105、90、75 kg/hm2,速效磷含量〉35.5 mg/L,建议不施磷肥.
To research systematically abundance and deficiency indices and formula fertilization of soil P by soil testing in rice district,field experiments on fertilizer efficiency of rice were carried out in Rice Soil of South Henan. ASI(Agro Services International)method was used to test soil samples and calibrate ASI soil test according to the typical response categories(55%,68%,78%,95%of relative yield to soil nutrient values,relative yield was the rate of rice yield in the treatment NK and NPK)and establish the abundance and deficiency indices of soil available P in rice soil of South Henan based on ASI soil testing and fertilizer recommendation. The calibration coefficients of soil available P relate significant positively with rice relative yield of the treatment NK by power exponent based on ASI in South Henan rice district. The very low,low,medium,high and very high index for soil available P were<7.5 mg/L, 7.5-13.5 mg/L,13.5-17.5 mg/L,and 17.5-35.5 mg/L,>35.5mg/L,respectively. This experiment suggested that the recommended fertilizer quantity were 135 kg/hm2,105 kg/hm2,90 kg/hm2,75 kg/hm2. When soil available P were>35.5 mg/L,the fertilizer quantity can be reduced or not applied.
出处
《河南科学》
2016年第6期883-886,共4页
Henan Science
基金
河南省财政预算项目"优质稻米的关键施肥技术研究"(20137913)
农业部行业专项"主要粮食作物一次性施肥技术研究与示范"(201303103)
关键词
水稻
ASI方法
水稻土
有效磷
丰缺指标
rice
ASI method
paddy soil
available phosphorus
abundance and deficiency critical index
