作者首先扼要地阐述了现有的文献资料并指出,为了给牛群在夏季建立稳定的饲料基地,措施之一是通过充足的灌溉、选择专用的饲料牧草和施加无机肥等途径,提高草地单位面积产量。然而无机肥对草地饲料的化学成分,以及牛群采食这些饲料后的营养物质的吸收率都有一定影响。过剩的氮肥,不但抑制牧草生长,而且牧草中积蓄的硝酸盐 The authors first outlined the available literature and pointed out that one of the measures to establish a stable feed base for herds in the summer is to increase the number of grassland units by means of adequate irrigation, selection of dedicated forages and application of inorganic fertilizers Area production. However, inorganic fertilizers have some effect on the chemical composition of grassland feedstuffs and on the nutrient uptake rate of cattle following these feeds. Excess nitrogen fertilizer, not only inhibit the growth of forage grass, but also the accumulation of nitrate in the pasture