不同施肥条件和滴灌方式对青椒生长的影响

    Influences of subsurface drip irrigation and surface drip irrigation on bell pepper growth under different fertilization conditions

    • 摘要: 该文通过大田试验,比较了地下滴灌与地表滴灌及其不同施肥量对青椒生长的响应。试验设置地下滴灌和地表滴灌2个灌水处理和0、75、150、300 kg/hm2 4个施肥水平,灌水周期为4 d。另外设1个畦灌对照处理。结果表明,2 a中地下滴灌产量均高于地表滴灌,2007年平均高4%,2008年平均高13%。而地下滴灌耗水量低于地表滴灌,2007年平均低6.7%,2008年平均低7.3%。地下滴灌和地表滴灌0~40 cm土层的根系总根长分别是畦灌的2.44和1.46倍,且地下滴灌10 cm以下各层的根长占总根长的百分比,比地表滴灌高7%,这说明地下滴灌不仅促进作物根系的生长,而且使根系更多的扎入较深土层。地下滴灌150 kg/hm2施氮量为青椒的最优灌溉施肥策略。

       

      Abstract: A 2-year field experiment was conducted in 2007, 2008 to study the response of bell pepper to subsurface drip irrigation (SDI) and surface drip irrigation (DI). Four nitrogen levels of 0, 75, 150, 300 kg/hm-2 (N0, N75, N150, N300) comprised the fertigation treatments. The irrigation interval was 4 days. The results showed that, bell pepper yields for treatment SDI were higher than that for DI by 4% in 2007, and 13% in 2008, respectively. The water consumption of SDI was lower than that of DI by 6.7% in 2007, and 7.3% in 2008, respectively. The root length density of SDI and DI was 1.46 and 2.44 times BI (border irrigation). The percent of root length under 10 cm of SDI were higher than that of DI by 7 percent, which means SDI not only promote the growth of crop root system, but also promote deep insertion of the root system. Treatment SDI N150 was recommended as the optimal strategy for improving bell pepper yield and WUE, reducing NO3--N leaching.

       

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