保护作物又称之为掩护作物或掩盖作物。在播种多年生牧草时,一般都加播保护作物。多年生牧草在生长初期发育很慢,容易被杂草所掩盖而致降低牧草的产量,发挥不了牧草的作用。所以在播种多年生牧草的时候,加播生长很快的一年生禾榖类作物,如小麦、大麦、黑麦等,就可以抑制杂草的生长,使多年生牧草在生长的第二年就可以获得限高的产量。并且在秋播的情况下,还有保护牧草减少冬害的作用。所以在播种多年生牧 Protected crops, also known as cover crops or cover crops. When sowing perennial grasses, crop protection is generally added. Perennial grasses grow slowly at the beginning of growth and are easily covered up by weeds, thus reducing the yield of pasture and failing to play the role of pasture. Therefore, when planting perennial grasses, planting annual crops such as wheat, barley and rye can quickly increase the growth of weeds and make perennial grasses obtain the limit in the second year of growth High output. And in the case of autumn sowing, there is the role of pasture protection to reduce winter pests. So sowing perennial herds