Corn (Zea mays L.) stover is an increasingly important feedstock for biofuel and bioproduct production; however, excessive harvest of corn stover from agricultural fields may affect corn seedling emergence and subsequent plant population which may reduce corn growth and yield. Field experiments were conducted over four consecutive growing seasons in southwestern Ontario to determine under continuous corn cropping system the effects of no-tillage (NT), conventional tillage (CT), and five rates of stover harvest (0, 25, 50, 75, and 100 wt. %) on corn seedling emergence in a Harrow sandy loam and in a Brookston clay loam. Time to achieve 50% seedling emergence (t_0.5), emergence rate constant (k_G), and final seedling population (M_G) were adequately simulated using the Gompertz function. Irrespective of stover removal rate and soil type, t_0.5 was 2 d longer, and k_G was 32% lower, under NT compared to CT. In Harrow sandy loam, stover removal from NT reduced t_0.5 in 1 out of 4 yr. The 100% removal reduced t_0.5 relative to 0, 25, 50, and 75% removal by 1.1–2.2 d in 2015. Averaged across both tillages and all removal rates, k_G was greater in Harrow sandy loam than in Brookston clay loam. Stover removal rates had no effect on M_G but averaged over all removal rates and soil types, M_G was 9% lower for NT compared to CT in 2016. No-tillage practice under corn production can impede seedlings emergence early in the growing season and stover removal from the field can help mitigate against this effect.

中文翻译：

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秸秆收割对玉米出苗的影响

玉米 ( Zea mays L.) 秸秆是生物燃料和生物产品生产日益重要的原料；然而，从农田过度收获玉米秸秆可能会影响玉米幼苗的出现和随后的植物种群，从而可能降低玉米的生长和产量。在安大略省西南部连续四个生长季节进行田间试验，以确定在连续玉米种植系统下免耕 (NT)、常规耕作 (CT) 和五种秸秆收获率（0、25、50、75、和 100 重量％)在哈罗砂质壤土和布鲁克斯顿粘壤土中的玉米幼苗出苗时。达到 50% 出苗率 (t _0.5 )、出苗率常数 (k _G ) 和最终幼苗数量 (M _{G ) 的时间}) 使用 Gompertz 函数进行了充分模拟。无论秸秆去除率和土壤类型如何，与 CT 相比，NT 下的t _0.5长 2 天，k _G低 32%。在 Harrow 砂壤土中，4 年中有 1 年从 NT 中去除秸秆使 t 降低_0.5。2015年，相对于 0、25、50 和 75% 的去除，100% 去除使 t _0.5减少了 1.1-2.2 天。在两种耕作和所有去除率之间平均，哈罗砂壤土的k _G大于布鲁克斯顿粘壤土。秸秆去除率对 M _G没有影响，但在所有去除率和土壤类型上取平均值，M _G 与 2016 年的 CT 相比，NT 低 9%。玉米生产中的免耕做法会阻碍生长季节早期的幼苗出苗，从田间移除秸秆可以帮助减轻这种影响。