不同水分处理对烟农0428产量及水分利用效率的影响

摘要

The effects of different water treatments on the yield,yield components and water use efficien-cy of Yannong 0428 were studied in field.The results showed that the biological yield,economic yield and e-conomic coefficient of wheat decreased with the drought degree increasing.The biological yield and economic yield of Yannong 0428 decreased markedly when the soil water content below 60%,which showed 60% was the critical water content point.The relative soil water content of 60% was the critical value fitted to keep more than 6 million spikes per hectare from sowing to jointing and kept 1 000 -grain weight over 40 g from jointing to grain filling.The economic yield and water use efficiency of treatment 6 were 9 200.4 kg/hm2 and 24.81 kg/(hm2 ·mm)respectively,which indicated that the water use efficiency(WUE)increased with the soil water content increasing in a certain range,and the WUE declined when the relative soil water content was out of the range.%在大田条件下研究了不同水分处理对烟农0428产量、产量构成因素以及水分利用效率的影响。结果表明：随着干旱程度的加剧，小麦生物产量、经济产量和经济系数降低；当土壤相对含水量低于60％时，烟农0428的生物产量、经济产量大幅度降低，说明土壤相对含水量60％是其获得较高籽粒产量的水分临界点；播种至拔节期，60％的土壤相对含水量是保证公顷穗数在600万以上的水分临界值，拔节至灌浆期它又是保证千粒重在40 g 以上的水分临界值；处理6（非需水关键期和需水关键期的土壤相对水分含量下限是60％）经济产量为9200．4 kg／hm2，水分利用效率高达24．81 kg／（hm2·mm），说明一定范围内，水分利用效率随土壤水分含量的增加而增加，超过一定范围后，水分利用效率呈明显的下降趋势。