【摘要】 为了研究耒阳市"烟—稻"种植模式下晚稻的最佳施钾量,以T优272为供试晚稻品种,进行钾单因素4水平6处理的田间肥效试验。结果表明:施纯钾2 kg/667m~2,晚稻产量最高,净收益最大,分别比对照增产20.0～53.3 kg/667m~2,增收52.00～138.66元/667m~2。回归分析结果表明:"烟-稻"栽培模式下,晚稻产量与钾肥用量之间相关程度不高,这可能与供试土壤钾养分含量较高有关。根据钾肥效应一元二次回归模型得出:在试验条件下施纯钾1.78 kg/667m~2,对应最佳经济产量为484.4kg/667m~2。更多还原

【Abstract】 In order to study the optimal potassium content of late rice under the Leiyang "tobacco-rice" planting pattern, the field effect test of potassium single factor at 4 levels with 6 treatments was conducted on the late rice variety T-272. The results showed that pure potassium of 30 kg/hm~2 obtained the highest yield and maximum net profit, respectively 300.0-799.5 kg/hm~2 and 780.0-2 079.9 Yuan/hm~2 more than the check. The regression analysis showed that the correlation between the yield of late rice and the amount of potassium fertilizer was not significant under the "tobacco-rice" cultivation model, which might be the result from a high potassium content in the raw soil. According to the quadratic regression model of potash effect, the pure potassium 26.7 kg/hm~2 under the test condition would theoretically reach the best profitable yield 7 266.0 kg/hm~2.更多还原