保证单位播种株数发挥机械播种增产作用李景安为了夺取玉米高产，现在普遍选用高产耐密品种。由于各品种要求的株距不同，即单位保苗株数不同，要发挥优良品种的增产作用，首先要保证单位面积播种株数，保证了播种株数，才能保证高产的保苗株数，如播种时播种株数少，就会... Sowing units to ensure that the number of units to play the role of mechanical sowing Li Jing An In order to seize corn high yield, now widely used high-yielding tolerance varieties. Due to the different plant spacing required for each variety, that is, the number of seedlings per unit is different, to play a role of increasing yield of fine varieties, we must first ensure that the number of sown per unit area to ensure the number of sown to ensure high seedling number, such as planting sowing less, meeting...