Direct-seeded rice (DSR) is an emerging resource-saving rice production practice. It can be alternative to input-intensive conventional transplanted puddled rice, which has encountered problems, relating to water, nutrients, energy, and environment. DSR can save water, labour, and energy, reduce greenhouse gases emission and improve soil properties. But, weeds are major constraint, which can cause complete failure of rice. Effective weed management is essential to achieve higher yield and resource-use efficiencies. Herbicide is a more effective and economical option than other weed control methods. But, its efficacy is influenced by herbicides and their use rates, and the weed species that vary across locations, depending on climate and soil. Therefore, this field experiment was carried out to evaluate the combinations of pre-emergence (~ PE) and post-emergence (~ PoE) herbicides as sequential applications, and their impacts on weeds, crops, economics, water productivity, and major nutrients-use efficiencies. It was observed that weed control treatments reduced weed density by 68–84.5% and weed dry weight by 71.6–86.7% at 60 days after sowing (DAS) compared to unweeded control (UWC). Among them, the pendimethalin 1000 g ha^–1 PE at 1 DAS followed by (~ fb) penoxsulam + cyhalofop-butyl 130 g ha^–1 (pre-mix) PoE at 25 DAS resulted in significant reduction in weed density (~ 84.5%) and weed dry weight (~ 86.7%) at 60 DAS. These sequential herbicides application increased effective tillers (233.3 m^–2), grains weight per panicle (2.54 g), and grain yield (3.92 t ha^–1) of rice, and irrigation (0.87 kg m^–3) and total water productivity (0.31 kg m^–3) by 288.2%, 75.2%, 378.9%, 378%, and 380%, respectively, than those in UWC. This resulted in 17.9% and 73.3% higher net returns and net benefit: cost, respectively, than even weed-free control (WFC) and was superior to all. Contrast analysis revealed that the brown manuring (BM) fb almix 20 g ha^–1 (pre-mix) applied at 40 DAS was similar to it, reducing weed density by 82.7% and dry weight by 83.3%. This study suggests that the sequential applications of herbicides or integration of herbicides with BM would provide broad-spectrum weed control and higher productivity and profitability in DSR. Controlling weeds may also reduce/economize water use and increase use efficiencies of N, P, and K in DSR.

直播稻（DSR）是一种新兴的节约资源的稻米生产方式。它可以替代投入密集的常规移植小米饭，后者遇到了与水，养分，能源和环境有关的问题。DSR可以节省水，劳动力和能源，减少温室气体排放并改善土壤特性。但是，杂草是主要的限制因素，可能导致水稻完全衰竭。有效的杂草管理对于实现更高的产量和资源利用效率至关重要。除草剂是比其他杂草控制方法更有效和经济的选择。但是，其功效受除草剂及其使用率的影响，杂草种类因气候和土壤的不同而异。因此，进行了该田间试验，以评估出芽前（〜PE）和出芽后（〜PoE）除草剂按顺序施用的组合，以及它们对杂草，农作物，经济，水分生产率和主要养分利用效率的影响。观察到，与未除草对照（UWC）相比，在播种后60天（DAS），除草处理使杂草密度降低68-84.5％，杂草干重降低71.6-86.7％。其中，二甲戊灵1000克ha在1个DAS时^–1 PE，然后是（〜fb）戊磺舒拉+环氟丁酯130 g ha –在25个DAS时PoE（^1）（预混合）PoE导致杂草密度（〜84.5％）和杂草干重（〜86.7 ）大大降低％）在60 DAS。这些连续的除草剂施用增加了水稻的有效分till（233.3 m ^–2），每穗谷物重量（2.54 g）和水稻的谷物产量（3.92 t ha ^–1），灌溉（0.87 kg m ^–3）和总水分生产率（ 0.31千克米^–3）分别比UWC的288.2％，75.2％，378.9％，378％和380％。这导致净收益和净收益：成本分别比无杂草控制（WFC）高出17.9％和73.3％，并且要优于其他所有品种。对比分析表明，在40 DAS上施用的20 g ha ^-1棕肥（bb）fb混合物（预混合物）与之相似，杂草密度降低了82.7％，干重降低了83.3％。这项研究表明，除草剂的顺序施用或除草剂与BM的整合将为DSR提供广谱的杂草控制以及更高的生产率和利润率。控制杂草还可以减少/节约用水，并提高DSR中N，P和K的使用效率。