一、问题的提出随着化肥工业的发展,甘蔗施用化肥(主要是氮肥)的水平有了很大的提高,以广东主产蔗区——珠江三角洲沙围田蔗区为例,亩施氮量(拆硫酸铵计)1959年为36斤,1961年为55斤,1963年为104斤,近几年来,施氮水平更高,据调查了解,不少社队甘蔗的施氮量已超过200斤(拆硫酸铵),有的社队碳铵施用量已达500～600斤之多,高产田的施肥水平就 First, the issue put forward With the development of fertilizer industry, sugar cane fertilizer (mainly nitrogen) has greatly improved the level of sugar cane area in Guangdong - the Pearl River Delta Shahe sugarcane area, for example, The amount of ammonium sulfate (disassembled) was 36 kg in 1959, 55 kg in 1961 and 104 kg in 1963. In recent years, the level of nitrogen fertilizer has been higher. According to the survey, quite a number of sugar cane nitrogen has been surpassed 200 kg (demolished ammonium sulfate), and some commuters ammonium bicarbonate application has reached 500 to 600 kg as much as the fertility level of high yield field