作者研究了四种氮素化肥,五个等级施肥量对幼龄茶树的肥效。增加氮素的供应,往往能促进茶树的生长。但达到一定数量后,多余的氮就不能为茶树利用于生长上。且硫酸铵随着施用量的增加还会抑制生长,并从在重施肥量的叶片表征上观察到氨的毒害。茶树单从硫酸铵或硝酸钙吸收氮素时,其叶片含铁量较之从硝酸铵或尿素吸收氮素的为低。施氮素低量时,茶根内淀粉贮量有较高的倾向,而在施最高量氮素情况下,茶树把根内的淀粉几乎耗尽了。在供试的茶株中,尿素的各级施用量都使根内淀粉贮量普遍增加,这说明了它是一种良好的氮肥类型。文中也讨论了碳氮比与茶树修剪恢复上应用的关系。 The author studied the effects of four nitrogen fertilizers and five levels of fertilizers on young tea plants. Increasing the supply of nitrogen can often promote the growth of tea trees. However, after reaching a certain amount, excess nitrogen can not be used for the growth of tea trees. And ammonium sulfate also inhibited the growth as the application amount increased, and ammonia poisoning was observed from the leaf characterization on the heavy application amount. Tea alone from ammonium sulfate or calcium nitrate absorption of nitrogen, the leaf iron content than from ammonium nitrate or urea nitrogen absorption is low. When the amount of N fertilizer was low, the starch storage in tea root had a higher tendency, while in the case of applying the highest amount of nitrogen, the tea tree almost completely consumed the starch in the root. In all the tea plants tested, urea application at all levels increased the root starch storage generally, indicating that it was a good nitrogen fertilizer type. The paper also discussed the relationship between carbon and nitrogen ratio and the application of tea tree pruning recovery.