Improper weed control can cause about 30-35 reduction in crop yield. Weeding is mostly done manually in narrow-spaced crops in India. Mechanical weed control in row crops reduces drudgery, save time, cost of operation and labour requirement. Presently, single-row weeder for wide-spaced crops are available and being used, but for narrowspaced crops weeding is done manually. A two-row self-propelled rotary weeder for narrow-spaced crop was designed and developed. The developed rotary weeder consists of 5 hp engine, main frame, rotary unit, handle, transport wheel and J-type blade. The field capacity, field efficiency, weeding efficiency and plant damage by the developed rotary weeder were found to be 0.09 ha h-1, 67.98, 80.12, and 2.9, respectively. The cost of operation, payback period and breakeven point of developed rotary weeder were calculated as Rs 1733 ha(-1), 1.18 year and 91.84 h yr(-1), respectively. The developed rotary weeder saved 93 labour requirement over manual hand hoe i.e. Kasola.
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机译：杂草控制不当会导致作物减产约30-35%。在印度，除草主要是在狭窄的作物中手动完成的。行间作物的机械杂草控制减少了苦差事，节省了时间、操作成本和劳动力需求。目前，用于大间距作物的单行除草机已经可用并正在使用，但对于窄间距作物，除草是手动完成的。设计并研制了一种用于窄间距作物的两行自走式旋耕除草机。开发的旋转式除草机由5马力发动机、主机架、旋转装置、手柄、运输轮和J型叶片组成。研制旋耕除草机的田间容量、田间效率、除草效率和植株损害分别为0.09 hm-1、67.98%、80.12%和2.9%。开发的旋耕除草机的运行成本、投资回收期和盈亏平衡点分别计算为1733 ha（-1）、1.18 h和91.84 h yr（-1）。与手动锄头（即 Kasola）相比，开发的旋转除草机节省了 93% 的劳动力需求。
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