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bird vetch
相关语句
  相似匹配句对
     The Bird
     独一无二的鸟
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     The Ant and the Bird
     蚂蚁与鸟
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     Resarch on the Rhetoric Art of Pick Vetch
     《采薇》修辞方式初探
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     Oats and Vetch Mixture Seedling Trial
     化隆县燕麦与箭豌豆适宜混播比筛选试验
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Stiffgrass was one of the staple noxious weeds in winter wheatfield in Shanghai and Huaibei area of Jiangsu Province.Its infestationand competition with crops and corresponding control practices werestudied in field and laboratory experiments,The results are as follows:stiffgrass caused the yield loss of wheat with its high population andstrong competition capacity and its obvious emergence peak in wheatfield could be affected by meteorological conditions,The critical periodof competition between stiffgrass...

Stiffgrass was one of the staple noxious weeds in winter wheatfield in Shanghai and Huaibei area of Jiangsu Province.Its infestationand competition with crops and corresponding control practices werestudied in field and laboratory experiments,The results are as follows:stiffgrass caused the yield loss of wheat with its high population andstrong competition capacity and its obvious emergence peak in wheatfield could be affected by meteorological conditions,The critical periodof competition between stiffgrass and wheat was about 20-50 days afterseedling emergence(i.e.4-6 leaf age of wheat).The germination anddevelopment of stiffgrass were restrained significantly in bird vetch fieldand planting this crop instead of wheat for a season is a successful wayin weed control,effects of other crop rotation systems were studied.An integrated weed management is proposed on the basis of this re-search.

硬草是上海和江苏淮北地区麦田的主要禾本科杂草。通过对硬草的生物学特性、发生为害规律、与作物之间的竞争以及防除措施的研究,初步认为:1.硬草发生数量极大,对小麦具有较强的竞争能力;2.麦田硬草有较明显的出草高峰,这易受气候因素的影响;3.硬草与小麦竞争的临界期为小麦出前后的20—50天之间,即小麦主茎叶龄4—6叶期。4.绿肥作物苕子能明显抑制硬草的萌发与生长,利用小麦-水稻-苕子-水稻轮作或小麦-水稻-油菜(结合化学防除)-水稻轮作是控制硬草为害的有效途径。

 
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