Sri Karan Narendra Agriculture University, Jobner-Jaipur, Rajasthan, India.
Post Harvest Physiology, Curtin University, Perth, WA, Australia.
Bull Environ Contam Toxicol. 2022 Mar;108(3):430-436. doi: 10.1007/s00128-021-03265-w. Epub 2021 May 22.
The study was conducted to evaluate the suitability of different weed management practices under influence of varying levels of N doses to test their effects on the various soil microflora and dehydrogenase enzyme activity in the winter onion field during 2016-2017 and 2017-2018. There were a total of twenty eight treatments replicated three times under the split-plot design (SPD). The treatments associated with weed management practices were applied to the main plots and the different N doses were given in each subplot. Microbial population and dehydrogenase enzyme activity in soil and crop weed competition index were determined. The two-hand weeding (HW) at 20 and 40 days after transplanting (DAT) of onion seedlings as well as preplant application of oxyfluorfen along with one HW at 40 DAT, exhibited a significant increase in dehydrogenase activity and microbial population in the soil when the N was applied at 100 kg ha. The study suggests that suitable weed management practices for the winter onion exerts a transient impact on soil microbial population, maintained good soil health and reduced crop-weed competition (CWC) with relatively less environmental hazards.
本研究于 2016-2017 年和 2017-2018 年在冬季洋葱田进行，评估了不同杂草管理措施在不同氮剂量影响下的适宜性，以测试它们对各种土壤微生物区系和脱氢酶活性的影响。采用裂区设计（SPD），共设 28 个处理，重复 3 次。将杂草管理措施应用于主区，在每个副区施入不同的氮剂量。测定了土壤微生物种群和脱氢酶活性以及作物与杂草竞争指数。洋葱苗移栽后 20 天和 40 天进行两次人工除草（HW），以及在移栽前施用氟氧氟草醚，然后在 40 天进行一次 HW，当施氮量为 100 公斤/公顷时，土壤中的脱氢酶活性和微生物种群显著增加。研究表明，冬季洋葱的适宜杂草管理措施对土壤微生物种群产生短暂影响，保持了良好的土壤健康，降低了作物与杂草的竞争（CWC），且相对较少产生环境危害。
