1．新梢生长缓慢、细弱、叶小直立、叶色黄绿且薄，叶柄、叶脉变红，花少、果小、早熟及易落，是缺氮的“长相”。在春季应施尿素或硝酸按等氛素肥料，也可在生长前期叶面喷洒0．2％－0．3％的尿素或硝酸锭。2．开花、展叶迟缓，枝条下部芽不萌发，新消长势减弱，叶片变小，色? 1. Shoot growth slow, weak, small leaves erect, yellow and green leaves thin, petiole, veins red, flowers less, fruit small, precocious and easy to fall, is the “appearance” of nitrogen deficiency. In the spring should be applied urea or nitric acid by the other air-fertilizers, but also in the early growth of foliar spraying 0.2% -0.3% of urea or nitric acid ingot. 2. Flowering, leaf retardation, buds under the branches do not germinate, the new consumption weakened, leaves smaller, color?