灌水模式对作物生长、养分吸收及水分利用效率的影响

Effect of irrigating patterns on the growth, nutrient uptake and WUE on the corn seedling

在室内土培条件下,研究了灌水模式对玉米、向日葵幼苗水分利用率、养分吸收、根系NRA、根系活力及生物量的影响。结果表明:在灌近根部土柱的灌水模式下,玉米幼苗根系活力最高,NRA高,吸收的氮、磷、钾较多,水分利用率最高,其生物量较高。近根部小范围灌水有利于提高水分利用率,对生物量影响最小。

A potted plant experiment was carried out with cultured loessial soil using corn (Zea mays L) named Shandan No.9 and sunflower(Helianphus annuus L.) named American's oil sunflower as the indicating crops to study the effects of irrigating patterns on the growth, water use efficiency, root activity, root's NR activity and biomass. The results showed that, when the soil near the root was irrigated, the root activity of corn seedling was very high, and the nitrate reductase activity was also high, and more N, P and K were absorbed. The most important thing was that under this irrigating mode, water use efficiency (WUE) was the highest, and the biomass was the highest. So the conclusion was that, irrigating the crop confining in the little area near the root would be propitious to raisiug the water use efficiency, and had a little effect on biomass.