Abstract:

Utility efficiency of limited water on spring wheat under continuous drought stress condition, could be increased after spraying the solution of sodium nitro-fulvate three times before anthesis, after anthesis and grouting. The concentration of fulvic acid was set to be 50, 100 and 150 mg L^-1 which contained 1.1 g L^-1 of Na^＋. Spraying concentration set to be 50 mg L^-1 had the best effect on drought resistance. It could increase 9.4 % of yield when compared with CK, but decrease 13 % of water consumption. It could also increase 27.6 % of yield when compared with the treatment of spraying water. The germination percentage and water content of spring wheat could also be increased after its seed soaked by the solution, which showed that the effect is interaction between the two main components, sodium nitro-fulvate and sodium nitrate. However, spraying potassium nitro-fulvate, which contained 100mg L^-1 of fulvic acid and 1.8 g L^-1 of K^＋ led to decrease 7.6 % of yield when compared with the treatment of spraying water. It restrained the grow
wth of spring wheat.

Key words: nitro-fulvate, nitrate, spring wheat, drought resistance

摘要：

对持续干旱处理的盆栽春小麦，分别在扬花期前、后和灌浆期3次喷施50、100和150 mg／L的含1．1 g／L Na^＋的硝基黄腐酸钠混合液，可以提高春小麦对有限水分的利用效率。试验中以50 mg/L喷施浓度的抗旱效果最好，较对照增产9．4％；生育期总耗水量减少13％，较喷水处理增产27．6％。此外，浸种试验中硝基黄腐酸钠混合液所表现出的提高春小麦发芽率和苗期植株含水量的作用是硝基黄腐酸钠及硝酸钠（工艺副产物）的叠加效应。而喷施100 mg／L含与Na^＋等摩尔浓度（4．6 g／L）K^＋的硝基黄腐酸钾混合液较喷水处理减产7．6％，有抑制效应。

关键词: 硝基黄腐酸盐 硝酸盐 春小麦 抗旱