冬小麦氮营养诊断及氮追肥推荐  

The Diagnosis of Tissue NO_3^--N and N fertilizer Topdressing Recommendation Model for Winter-wheat

作　　者：帅修富[1] 王兴仁[1] 曹一平[1] 易小琳[1] 

机构地区：[1]北京农业大学植物营养系,北京100094

出　　处：《中国农业大学学报》1995年第S2期47-51,共5页Journal of China Agricultural University

摘　　要：田间小区试验表明,冬小麦拔节期(04-05)植株 NO_3^--N 含量(二苯胺比色法)与地上部吸氮量及土壤剖面0～100 cm 内 Nmin 之间均存在着良好的正比关系,因而可以作为冬小麦氮营养诊断的指标。冬小麦产量(Y)、植株 NO_3^--N 含量(S)及氮肥追施量(Nd)之间的数学模型为:Y=9.158(Nd+45.909 S)^(0.5)-0.365(Nd+45.909 S)。由此模型可得到,冬小麦获最大利润的氮素追肥推荐模型为:Nd=158.3—45.9S,不需追氮的植株 NO_3^--N 含量临界值为2.4以上。Based on field experiments,the NO_3^--N concentration winter-wheat stem bases sample at 5th April determined by the diphenylamine method has a proportional relationship with the nitrogen up- taken by the shoot and the profile(0～100 cm)of the soils.Thus,it can be used as a predictor of nitrogen diagnosis during crop growth.According to the relationship above,a model was established:Y=9.158 (Nd+45.91S)^(0.5)-0.365(Nd+45.91S).Here,Y,Nd,S are the winter-wheat yield,the amount of nitro- gen dressing and the NO_3-N concentration in the wheat stem bases,respectively.Based On the model,the N-fertilizer dressing recommendation model for maximum profits is:Nd=109.3-45.91S.the critical value of plant NO_3-N concentration is 2.4.

关 键 词：冬小麦 二苯胺比色法 氮 营养诊断 追氮肥 

分 类 号：S512.11[农业科学—作物学]