1　结合“晾根” ,增施以氮肥为主的花前肥　秋梢停长现蕾时 ,挖开根系周围土壤 ,深 10～ 15ｃｍ ,截断部分细根 ,晾根 10～ 15天左右 ,然后株施尿素 0 2 5ｋｇ ,再覆土。晾根前期可抑制地上部和地下部生长 ,后期可促发新根 ,健壮树势 ,提高树体抗寒能力。2　叶面喷施微肥和化 1 combined with “dry root”, the increase of nitrogen-based fertilizer before the fall of autumn buds to stop long-term budding, dig open the soil around the roots, deep 10 ~ 15cm, cut off part of the fine roots, dry roots 10 to 15 days or so, Strain urea 0 2 5kg, then soil cover. Early aerial root can inhibit the growth of the shoots and the ground, the latter can promote new roots, robust tree vigor and improve the ability of trees cold hardiness. 2 foliar application of fertilizer and fertilizer