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利用桶栽试验,研究了酸性土壤施用不同量的生石灰(750、1500和3000 kg/hm2)、镁肥(150、300和600 kg/hm2)及硅肥(60、120和240 kg/hm2)对甘蔗幼苗生长和重要生理指标的影响。结果表明,施用适量的生石灰、镁肥及硅肥,可提高酸性土壤甘蔗幼苗叶片叶绿素含量,增强甘蔗叶片光合作用能力,进而促进了甘蔗幼苗的生长。然而,过量施用生石灰(3000 kg/hm2)、镁肥(600 kg/hm2)及硅肥(240kg/hm2)会对甘蔗幼苗生长带来不利影响,其中,过量施用生石灰主要是抑制了甘蔗根系活力,过量施用镁肥主要是降低了叶片净光合速率,过量施用硅肥主要是降低了叶片叶绿素含量。因此,在施用生石灰、镁肥、硅肥时,应注意其施用量。
Using barrels experiments, different amounts of quick lime (750, 1500 and 3000 kg / hm2), magnesium fertilizer (150, 300 and 600 kg / hm2) and silicon fertilizer (60, 120 and 240 kg / hm2) Effects of Sugar Cane Seedlings on Growth and Some Important Physiological Indexes. The results showed that the application of appropriate amount of quicklime, magnesium fertilizer and silicon fertilizer could improve the chlorophyll content of sugarcane seedling leaves in acidic soils and enhance the photosynthesis ability of sugarcane leaves, which in turn promoted the growth of sugarcane seedlings. However, excessive application of quicklime (3000 kg / hm2), magnesium fertilizer (600 kg / hm2) and silicon fertilizer (240 kg / hm2) had an adverse effect on the growth of sugarcane seedlings. Excess application of quicklime mainly inhibited the root activity of sugarcane , Excessive application of magnesium fertilizer mainly reduced the net photosynthetic rate of leaves, excessive application of silicon fertilizer mainly reduced the content of chlorophyll in leaves. Therefore, the application of quicklime, magnesium fertilizer, silicon fertilizer, should pay attention to its application rate.