不同降雨状况下渭北旱地春玉米临界氮稀释曲线与氮素营养诊断

刘朋召,师祖姣,宁芳,王瑞,王小利,李军

Critical nitrogen dilution curves and nitrogen nutrition diagnosis of spring maize under different precipitation patterns in Weibei dryland

Peng-Zhao LIU,Zu-Jiao SHI,Fang NING,Rui WANG,Xiao-Li WANG,Jun LI

图2 不同降雨状况下旱地春玉米不同生育时期植株氮含量变化 a: 穗期多雨; b: 穗期干旱。V6: 拔节期; VT: 抽雄期; R3: 乳熟期; R6: 完熟期。N0、N1、N2、N3、N4依次表示: 2016-2017年施氮量分别为0、75、150、270和360 kg hm-2, 2018-2019年为0、90、180、270和360 kg hm-2。

Fig. 2 Plant N concentrations at different stages of dryland spring maize under the different precipitation patterns a: rainy at the ear stage; b: dry at the ear stage. V6: jointing stage; VT: tasseling stage; R3: milk stage; R6: maturity stage. Nitrogen was applied at N0, N1, N2, N3, and N4, that is, 0, 75, 150, 270, and 360 kg hm-2 from 2016 to 2017, and at 0, 90, 180, 270, and 360 kg hm-2 from 2018 to 2019.