在绿色种植条件下,将秋季种植的黑麦覆盖作物与除草剂相结合,减少大豆中帕尔默苋种子的产量

IF 1.3 Q3 AGRONOMY
Trey Stephens, Humberto Blanco-Canqui, Stevan Z. Knezevic, Jenny Rees, Katja Kohler-Cole, Amit J. Jhala
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引用次数: 0

摘要

通常在种植经济作物之前终止覆盖作物;然而,"绿色种植 "是一种替代方法,种植者可以将经济作物种植到生长旺盛的绿色覆盖作物中,然后在经济作物成活后终止覆盖作物。本研究的目的是:(1) 与在大豆播种前 2 周终止黑麦覆盖作物相比,确定将大豆(Glycine max L. Merr.)播种到立杆黑麦(Secale cereale L.)覆盖作物中是否能更好地抑制杂草;(2) 评估除草剂方案和黑麦终止时间对帕尔默苋(Amaranthus palmeri S. Watson)的控制、生物量、种子产量、大豆谷物产量以及效益/成本比的综合影响。2020 年至 2022 年在内布拉斯加州中南部进行了田间试验。在 2021 年,萌芽前(PRE)除草剂与播种后 2 周(WAP)终止的谷物黑麦可提供 95% 的帕尔默苋控制率,在 2022 年,PRE 后 28 天的控制率从 88% 到 98% 不等。在 2021 年,施用预除草剂后再施用(fb)晚发除草剂(LPOST),并在谷物黑麦生长期结束后 2 个月施用除草剂,对帕尔默苋的控制率为 85%-92%,而在 2022 年,施用 LPOST 除草剂 28 天后,控制率为 97%-99%。无论采用哪种除草剂,在 2 WBP 谷物黑麦终止期与 2 WAP 谷物黑麦终止期相比,帕尔默苋的密度都更高。在2021年,PRE fb LPOST除草剂方案与2 WAP终止黑麦生长相结合,可将帕尔默苋种子产量降至9100粒/株以下,在2022年则没有种子产量。2021 年,在 2 WAP 期终止黑麦对控制和降低帕尔默苋的密度起到了不可或缺的作用;但与在 2 WBP 期终止黑麦相比,它对大豆产量的影响明显。2022 年,冰雹和暴风对大豆植株和产量产生了混杂影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Integrating fall-planted cereal rye cover crop with herbicides for reducing Palmer amaranth seed production in soybean under planting green conditions

Integrating fall-planted cereal rye cover crop with herbicides for reducing Palmer amaranth seed production in soybean under planting green conditions

Cover crops are usually terminated prior to planting the cash crop; however, “planting green” is an alternative approach that allows growers to plant cash crop into an actively growing, green cover crop, which is then terminated after the establishment of the cash crop. The objectives of this study were (1) to determine whether planting soybean (Glycine max L. Merr.) into a standing cereal rye (Secale cereale L.) cover crop provides superior weed suppression compared to terminating cereal rye 2 weeks before soybean planting and (2) to evaluate an integrated effect of herbicide programs and cereal rye termination timing on Palmer amaranth (Amaranthus palmeri S. Watson) control, biomass, seed production, soybean grain yield, and benefit/cost ratio. Field experiments were conducted in southcentral Nebraska from 2020 to 2022. Preemergence (PRE) herbicide with 2 weeks after planting (WAP) termination of cereal rye provided >95% Palmer amaranth control in 2021 and varied from 88% to 98% in 2022 at 28 days after PRE. A PRE herbicide followed by (fb) late-postemergence (LPOST) herbicide with 2 WAP termination of cereal rye controlled Palmer amaranth 85%–92% in 2021 compared with 97%–99% control 28 days after LPOST herbicide application in 2022. Palmer amaranth density was higher with 2 WBP cereal rye termination compared with 2 WAP termination regardless of the herbicide program. PRE fb LPOST herbicide programs integrated with 2 WAP termination of cereal rye reduced Palmer amaranth seed production to less than 9100 seeds plant−1 in 2021 and no seed production in 2022. In 2021, terminating cereal rye 2 WAP played an integral role in controlling and reducing the density of Palmer amaranth; however, it had noticeable impact on soybean yield compared to terminating 2 WBP. In 2022, hail and windstorm had a confounding effect on soybean stand and yield.

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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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