覆草果园谨防缺氮果树覆草是近几年来大面积推广的一项果园管理措施。覆盖的杂草或作物秸秆碳氮比较高，一般都在３０─８０：１范围内，由于碳多氮少，微生物繁殖分解时，要从土壤中吸收大量氮素，若不及时补充速效氮肥．果园容易出现缺氮现象，影响花芽分化与形成。补充... Grass orchard to guard against nitrogen deficiency trees mulching grass is a large area in recent years to promote an orchard management measures. Covered straw or crop carbon and nitrogen are relatively high, generally in the range of 30 ─ 80: 1, due to less carbon and nitrogen, microbial propagation decomposition, to absorb a large amount of nitrogen from the soil, if not promptly added quick-acting nitrogen fertilizer. Orchard prone to nitrogen deficiency, affecting flower bud differentiation and formation. supplement...