硅肥处理对荞麦幼苗抗旱性的影响

研究不同浓度硅肥对荞麦幼苗抗旱性生理指标的影响, 综合指标比较各处理组的抗旱特性差异,筛选出适宜浓度的硅肥,为干旱地区合理施用硅肥提高荞麦产量提供科学依据。实验以榆荞3号种子为材料,催芽后盆栽,播种前,分别将0.05mol/L、0.10mol/L、0.15mol/L、0.2 mol/L硅酸钾( K2SiO3)溶液一次性施入轻度(田间持水量60%)、中度(田间持水量40%)和重度干旱胁迫(田间持水量20%)土壤中,蒸馏水处理作为对照,当苗长到两叶一心期,测其SOD,POD活性及可溶性糖的含量。结果表明：随干旱胁迫加剧,荞麦幼苗SOD、POD均下降,可溶性糖含量增加；加硅后的各处理组与同一胁迫程度的对照组相比,SOD、POD活性以及可溶性糖含量均有所上升,且在0.05mol/L的硅肥处理后各项生化指标均显著性地高于对照组。因此随灌水量减少,荞麦幼苗受到的干旱损伤加剧,适宜的硅肥有助于缓减荞麦幼苗的干旱损伤,提高其抗旱能力。

Effects of silicon fertilizer treatment on buckwheat seedling drought resistance

Study on the effects of different concentrations of silicon fertilizer on physiological indices of drought resistance in Buckwheat Seedlings, drought resistant characteristics difference comparison of the comprehensive index of each group, screened the suitable concentration of silicon, and provide scientific basis for the reasonable application of silicon fertilizer to improve buckwheat yield in arid regions. the No. 3 seed of buckwheat for the material was potted after germination. before planting, respectively 0.05mol / L, 0.10mol / L, 0.15mol / L, 0.2 mol / L potassium silicate (K2SiO3) solution was applied to a one-time mild (60% of field capacity), moderate (40% of field capacity) and severe drought stress (20% field capacity) soil, distilled water as a control. When seedlings grow to two leaves stage, its SOD, POD activity and soluble sugar content was measured. The results show that increasing drought stress, the activity of SOD and POD of buckwheat seedling were declined and soluble sugar content was improved and each treatment group with the same degree of stress compared to the control group, SOD, POD activity and soluble sugar content have risen after pulsing silicon and treatment of Silicon 0.05mol / L of various biochemical parameters were significantly higher ground, which indicating the drought damage of buckwheat seedlings intensified after irrigation reduced and the appropriate silicon fertilizer helps mitigation of drought damage buckwheat seedlings, improve its drought resistance.