果树缺铁元素时,轻者叶片变黄,生长迟缓,重者则造成产量和品质下降,甚至引起树冠焦梢或整株死亡。下面介绍两种自配铁肥的方法。一、叶施铁肥1.配制方法。选择浓度为0.25%的硫酸亚铁、0.05%的柠檬酸、0.1%的尿素待用。在100千克水中加入50克柠檬酸,溶解后加入250克硫酸亚铁拌匀, When the fruit tree is deficient in iron, the leaves of the light yellowing and slow growth, while the heavy ones cause the decrease of yield and quality, even causing death of the crown or the whole plant. Here are two ways since the allocation of iron. First, Shi Shi iron fertilizer 1. Preparation methods. Select the concentration of 0.25% ferrous sulfate, 0.05% citric acid, 0.1% urea stand-by. In 100 kg of water by adding 50 grams of citric acid, dissolved by adding 250 grams of ferrous sulfate mix well,