摘要
通过田间试验研究了反射仪法和 Nmin法在宁夏扬黄新灌区春小麦氮营养诊断中的应用。结果表明 ,拔节期可作为春小麦氮营养诊断时期 ;确定了春小麦用 2种方法进行氮素营养诊断的硝酸盐临界值分别为2 4 41 .1 5mg/ kg( NO3- ) (反射仪法 )和 50 .39kg/ hm2 ( NO3- ) (土壤 Nmin法 )。同时由土壤 Nmin、植株硝酸盐诊断 。
Nitrate test strip and soil nitrate methods for diagnosing nitrogen nutritional status in spring wheat were studied in field experiment. They were applied for diagnosing nitrogen nutritional status in new irrigatable areas of Ningxia. The results suggested that the optimum diagnosis parts of plants was the stem base just prior to jointing stage,and the critical values of nitrate was 2 441.15 mg/kg(NO 3 -)(nitrate test strip),50.39 kg/hm 2(NO 3 -)(soil nitrate method).Base upon the results of the diagnosis, recommendation model of fertilizer N topdressing was set up.
出处
《西北农业学报》
CAS
CSCD
2001年第1期72-74,87,共4页
Acta Agriculturae Boreali-occidentalis Sinica
基金
宁夏回族自治区政府"九.五"科技攻关项目
关键词
新灌区
氮营养诊断
春小麦
New irrigated areas
Nitrogen nutritional status
Spring wheat
