The spread of morning glory (Ipomoea spp.) in Japanese soybean (Glycine max (L.) Merr.) fields has severely decreased soybean yields. Field levees are believed to be a source of this invasion. The introduction of Zoysia japonica Steud. is expected to suppress weed growth and reduce the required labor for weed management on the levees. In this study, field experiments were conducted on the soybean levees of turf (Z. japonica), bare, and weed (mainly broad leaf weeds such as white clover) from 2017 to 2019 to compare its effects on the occurrence, growth, and seed production of I. hederacea (L.) Jacq. var. integriuscula A. Gray. The canopy height in the turf levee was the lowest, and the vegetation cover rate was the highest. At the flowering and fruiting stage of I. hederacea var. integriuscula (September), the largest number of I. hederacea var. integriuscula that survived were on the turf levee; however, the plant length, dry weight, and the number of fruits were the least. Additionally, the stems of the morning glory on the turf levee were slight and spindly, and their growth and seed productivity were suppressed. Consequently, vegetation conversion to Z. japonica on the soybean field levees can be an effective strategy to suppress the colonization and growth of morning glory, thereby, improving soybean yields.

中文翻译：

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日本西南部大豆田堤坝上草坪草 (Zoysia japonica Steud.) 对全叶牵牛花 (Ipomoea hederacea Jacq. var. integriuscula A. Gray) 生长的抑制

牵牛花（Ipomoea spp.）在日本大豆（Glycine max (L.) Merr.）田中的蔓延导致大豆产量严重下降。现场堤坝被认为是这次入侵的根源。结缕草的引种。预计将抑制杂草生长并减少堤坝杂草管理所需的劳动力。本研究于2017年至2019年对草坪（ Z. japonica）、裸地和杂草（主要是白三叶草等阔叶杂草）的大豆堤进行田间试验，比较其对发生、生长和种子的影响。 I. hederacea (L.) Jacq的生产。变种 integriuscula A.格雷。草皮堤的冠层高度最低，植被覆盖率最高。在I. hederacea var.的开花和结果阶段。integriuscula（九月），数量最多的I. hederacea var. 幸存下来的integriuscula位于草皮堤坝上；但株长、干重、果实数最少。另外，草坪堤上的牵牛花茎细长，其生长和种子生产力受到抑制。因此，大豆田堤坝上的植被转为粳稻可以成为抑制牵牛花定植和生长的有效策略，从而提高大豆产量。