玉米秸秆全量粉碎耕翻还田条件下播种深度与镇压强度对玉米出苗率的影响

Effects of Different Strength of Compaction and Sowing Depth on Emergence Rate of Maize under the Condition of Entire Returning of Maize Straw after Smashed

采用田间原位试验的方法研究玉米秸秆全量粉碎耕翻还田条件下,不同镇压强度(250、450、650 g/cm^2)、播种深度(3、5、7 cm)以及起垄时期(秋起垄与春起垄)等耕作措施对玉米出苗率的影响。结果表明:起垄时期对出苗率无显著影响,播种深度与镇压强度对玉米出苗率影响分别达显著(P<0.05)与极显著水平(P<0.01),随着镇压强度的提高,玉米下玉米的出苗率,且播种深度和镇压强度交互作用极显著地影响玉米出苗率。在播种深度5 cm、镇压强度650 g/cm^2时玉米出苗率最高,达到96.5%,为本试验条件下最佳耕作措施。

A field experiment was conducted to study the effects of different strength of compaction(250, 450, 650g/cm^2), sowing depth(3, 5, 7 cm), as well as the ridging period on the emergence rate of maize under the conditionof entire returning of maize straw after smashed. The results showed that the ridging period had little impact onthe emergence rate of maize. The emergence rate was extremely significant affected by strength of compaction(P<0.01). The emergence rate of maize was affected significantly by the sowing depth(P<0.05). With the increase ofthe compaction strength, emergence rate of maize increased from 80.6% to 93.5%. The emergence rate of maizeat 5 cm was significantly higher than that of maize at 3 cm and 7 cm. The emergence rate of maize was extremelysignificant affected by interaction of sowing depth and strengthen of compaction. The highest emergence rate ofmaize was achieved 96.5%when the sowing depth was 5 cm and the strength of compaction was 650 g/cm^2, whichwas the best sowing treatment under the test conditions.