宁夏半湿润易旱区旱地春小麦抗旱性田间综合评价研究

The Comprehensive Fieid Evaluation of Dryland Spring Wheat in semi-humid Area Liable to Drought in Ningxia

采用春小麦田间形态综合指标对宁夏半湿润易旱区的１３个品种进行了抗旱性评价，分别评出抗旱品种、中抗品种和弱抗品种。具体方法是按品种比较试验的规格把供试品种直接播种到旱地，以自然干旱形成的土壤水分胁迫使植株形态及产量受到影响，分别测定根系的发达程度、叶面积大小，株高下降率、抗旱系数、出苗指数等抗旱指标，并对指标进行分级，然后根据各品种抗旱指标的综合级别确定该品种的抗旱性。

A spring wheat drought-resistant assessment of 18 varieties was con-ducted using the integrated indexes in semihumid area liable to drought in Ningxia. As aresult,high drought-resistant,moderate drought-resistant and low droughtresistant vari-eties were identified res pectively,The method ad opted was that wtieat varieties or culti-vars in the experiments were seeded directly in the dryland on the basis of standard spec-ifications for the comparative variety trials.Such droughtresistant indexes as root devel-opment,leaf area and germination percentage were measured through observationof ofthe deformed shapes of the plant and the reduced yields caused by soil water stress dueto natural droughts.These drought-resistance indexes were classifi<d,and then droughtresistance of each wheat variet y was determined in accordance with the integrated gradesof drought-resistance indexes for each wheat variety.