【摘要】 为明确施用黄腐酸钾对干旱胁迫小麦生长与产量的影响，采用盆栽试验，在春小麦分蘖至拔节期设置轻度干旱(田间持水量65%～70%)施用黄腐酸钾(15 kg/hm~2)、轻度干旱(田间持水量65%～70%)未施用黄腐酸钾、中度干旱(田间持水量55%～60%)施用黄腐酸钾(15 kg/hm~2)、中度干旱(田间持水量55%～60%)未施用黄腐酸钾、重度干旱(田间持水量45%～50%)施用黄腐酸钾(15 kg/hm~2)、重度干旱(田间持水量45%～50%)未施用黄腐酸钾和正常供水(田间持水量70%～80%,对照),共7个处理。结果表明，不同干旱胁迫下增施黄腐酸钾均较未施用显著提高小麦产量和生物量(P<0.05)。与对照相比，不同干旱胁迫下未施用黄腐酸钾处理均显著降低小麦株高、叶面积、SPAD、净光合速率、单株产量与生物量(P<0.05)。轻度干旱胁迫下增施黄腐酸钾处理小麦中后期叶片SAPD和净光合速率、穗宽、生物量显著高于对照(P<0.05);中度和高度干旱胁迫下增施黄腐酸钾与对照比较，小麦生物量、产量、穗粒数显著降低(P<0.05)。在小麦分蘖至拔节期不同程度干旱胁迫均会限制小麦生长发育，降低产量；小麦分蘖至拔节期施用黄腐酸钾可提升小麦应对干旱能力，提高小麦产量和生物量。更多还原

【Abstract】 In order to clarify the effects of different drought stresses and the application of potassium humate on the growth and yield of wheat, a pot experiment was conducted in this study. Seven treatments were set from the tillering stage to the jointing stage of spring wheat, including slight drought(field water holding capacity of 65%-70%) with potassium humate(15 kg/hm~2),slight drought(field water holding capacity of 65%-70%) without potassium humate, moderate drought(field water holding capacity of 55%-60%) with potassium humate(15 kg/hm~2),moderate drought(field water holding capacity of 55%-60%) without potassium humate, severe drought(field water holding capacity of 45%-50%) with potassium humate(15 kg/hm~2),severe drought(field water holding capacity of 45%-50%) without potassium humate, and normal water supply(field water holding capacity of 70%-80%,CK). The results showed that under different drought stresses,the application of potassium humate significantly promoted wheat growth and significantly increased wheat yield and biomass compared to no application(P <0.05).Compared with CK,the treatment without potassium humate application under different drought stresses significantly reduced wheat plant height,leaf area,SPAD,net photosynthetic rate,individual plant yield,and biomass(P <0.05).Under slight drought stress,the application of potassium humate increased the leaf SAPD,net photosynthetic rate,ear width,and biomass of wheat compared to CK(P <0.05);under moderate and severe drought stress,although the application of potassium humate significantly improved wheat growth compared to the untreated treatment,its biomass,yield,and grain number per ear were significantly reduced compared to CK(P <0.05).This study indicates that varying degrees of drought stress during the tillering to jointing stages of wheat can limit its growth and development,leading to a decrease in yield;applying potassium humate during the tillering to jointing stage of wheat can enhance its ability to cope with drought and increase wheat yield and biomass.更多还原