地下滴灌硅肥对紫花苜蓿生长及品质的影响

Effect of integration of water and silicon fertilizer on the growth of alfalfa under subsurface drip irrigation

为了探讨在地下滴灌条件下将硅肥随水一体施入土壤后硅肥对紫花苜蓿(Medicago sativa)生长及品质的影响,设计了模拟水硅一体化的地下滴灌装置,并采用苜蓿盆栽滴灌方法进行研究。设置4个硅肥水平(0、0.01、0.02和0.03g·kg^(-1),每千克土壤施用SiO2的克数),每个处理9次重复。结果表明,施硅的植株生长指标要显著好于不施硅的植株(P<0.05)。试验观测的两个茬次的苜蓿,施硅的处理植株相比于不施硅对照,其产量、叶面积、鲜干比、节间距、节间数等指标均有显著的提高(P<0.05)。不同茬次对比,施硅处理对于苜蓿的促进作用在生长初期要大于生长后期。施用硅肥对苜蓿营养指标的影响不明显,施硅量为0.02g·kg^(-1)的处理相比对照组粗蛋白含量最高,纤维素含量最低,并且0.02g·kg^(-1)处理的植株有较高的相对饲喂价值。所以,通过滴灌方式水肥一体施用硅肥可以促进紫花苜蓿的生长。

In order to explore the influence of integration of irrigation water and fertilizer on the growth and under subsurface drip irrigation （SDI）, the pot culture experiment simulated SDI and integrasilicon fertilizer was carried out with four treatments of silicon concentrations （0,0.01,0.02· kg^-1 Soil） and nine duplicates for each treatment. The results showed that six growth indexes silicon fertilizer were higher than that of without silicon fertilizer. As for the quality of alfalfa hay, CP with 0.02 g· kg^-1 silicon fertilizer was the highest, NDF with 0.02 g · kg^-1 silicon fertilizer was the least. So the conclusion was that the integration of irrigation water and silicon fertilizer under subsurface drip irrigation can promote growth of alfalfa, and silicon fertilizer promote the early growth stage of alfalfa more than the late growth stage of alfalfa. Plants with 0.02 g· kg^-1 Si fertilizer has higher quality than other plants.