硅肥用量对水稻茎秆抗折力的影响研究

研究不同硅肥施用量对水稻茎秆抗折力的影响，为水稻生产中合理施用硅肥，提高水稻抗倒伏能力提供重要参考。本研究选用了3个抗倒伏能力有一定差异的品种（组合）为材料，分析了3个水平硅肥施用量对水稻灌浆期的3个基部节间抗折力和整株抗推力的影响。施用硅肥的处理比未施用硅肥的对照处理的茎秆节间抗折力有一定程度的提高，D2处理从总体上增加抗折力的幅度较大，不同的品种抗折力的提高有所不同，其中‘绿优1号’、‘汕优63’在Si 60 kg/hm²处理下茎秆抗折力最大，‘中优838’在Si 30 kg/hm²处理下抗折力最大；而整株抗推力的表现与节间抗折力有一定差异，从分析结果看，在Si 30 kg/hm²处理下整株抗推力最大，折合成单茎抗推力也较大，且在3个品种上表现基本一致。一般的中籼水稻品种在生产中可适量施用硅肥来提高水稻的抗倒伏能力，一般施纯Si 30 kg/hm²，施硅量不宜过大，可根据不同的品种作适当调整。

The Effect of Silicon Fertilizer on Flexural Strength of Rice Culm

[OBJECTIVE] The aim was studying silicon fertilizer on flexural strength of rice stems. It had important reference role to use silicon fertilizer reasonably in rice production and improve lodging resistance.[METHOD] Three different lodging resistance ability rice varieties were used to study three rice stems internode flexural strength under three level silicon fertilizer and three earing times . [RESULTS] After using silicon fertilizer ,flexural strength of rice stem internode had improved greatly, and D2 treatment performed better. The effect of different rice varieties were different. lvyou 1 and shanyou 63 variety's flexural strength were the best under Si 60kg/hm2 treatment,besides zhongyou 838 variety's flexural strength was the best under Si 30kg/hm2 treatment;However,there had certain difference between whole flexural strength and internode flexural strength.From the result of the analysis, whole flexural strength performed best ,and single stem's flexural strength performed better ,moreover three varieties's performance were in accordance.[CONCLUSIOND]General indica rice varieties in production can be applied silicon fertilizer to improve rice lodging resistance ability, generally applying Si 30 kg/hm2 , but Si volume should not be applied too big, we can make appropriate adjustment according to different varieties.