Occurrence rhythm and controlling strategy after germination of gramineous weed in gramineous lawn in nanjing , jiangsu province 南京地区禾本科草坪上禾本科杂草的发生规律及苗后防除方法
Acceding to the number of species , the three of the biggest families are asteraceae , poaceae and legumimosae 被子植物中较大的科有3科，其中最大的科是菊科，其次分别为禾本科和豆科。
However , to exploit and utilize biological nitrogen - fixation is one of the important ways to solve those problems 因此，充分发掘和利用禾本科植物的生物固氮潜能，将是确保农业可持续发展的重要途径。
A comparison of transpiration characteristics and water use efficiency between poaceae plants and chenopodiaceae plants under the simulated light source 模拟光条件下禾本科植物和藜科植物蒸腾特性与水分利用效率比较
Gramineae , myrsinaceae , bambusoidea . mostly leguminosae , specifically aphis and coccids . mainly damage gramineae , leguminosae . some species are main vermins to paddies , sugar canes and bananas 主要危害禾本科植物、豆科植物，有的种是水稻、甘蔗、香蕉等植物的主要害虫。
Anemophily pollination by wind . plants pollinated in this manner ( e . g . grasses ) usrally have insignificant unscented flowers with large , often feathery stigmas 风媒：靠风力传送花粉的传粉方式。多数风媒植物具有不具香味色泽的花，柱头通常膨大呈羽毛状（如禾本科植物的花） 。
Caryopsis ( grain ) ( pl . caryopses ) a dry indehiscent fruit , typical of the grasses . it is similar to an achene except that the ovary wall is fused with the seed coat 颖果：一种不开裂的干果，是禾本科植物特有的果实类型。与瘦果相似，不同点在于颖果的果皮和种皮紧密愈合不易分离。
In the condition of the experiment , the effect of the long effect urea no . 4 to the wheat is better than millet as for the transformation and utilization condition of nitrogen in urea 表明，拔节期前是禾本科作物控释氮素的关键时期；在本试验条件下，就尿素氮的利用转化状况而言，小麦施用长效尿素四号优于谷子。
Because of the nitrogen fixation of legumes , even though legume forages absobed more nitrogen than grass forages , the soil nitrogen and organic matter used by legume forages were less than grass forages 豆科牧草耗氮量虽然比禾本科牧草多，但由于豆科牧草具有固氮作用，因而对土壤全氮和有机质的消耗量却比禾本科牧草低。
Based on multi - factor orthogonal designed field experiment , the ridge regression models of seed yield components and seed yield of the 6 grass species are founded through ridge regression analysis with big samples 摘要采用多区组多因素正交试验设计，通过大样本岭回归分析求出6种禾本科牧草种子产量因子与产量的岭回归模型。
