1965年我县梅坑公社各林场育了80多亩杉苗,由于播种前圃地没施基肥,苗木因缺氮而生长缓慢。我们用2,000多公斤氨水进行追肥试验,效果很好。氨水具有价廉、易吸收和见效快等优点。据华溪大队林场6月19日调查,6亩杉苗共施40公斤氨水,7天后苗木的生长量达3—4厘米,且生长旺盛,呈青绿 In 1965, Mei Lin commune in our county nurtured more than 80 acres of fir seedlings. Because no nitrogen was applied before sowing, seedlings grew slowly due to nitrogen deficiency. We use more than 2,000 kg of ammonia fertilizer test, the effect is very good. Ammonia is cheap, easy to absorb and quick and so on. According to the investigation of Huaxi Brigade and Forest Farm on June 19, a total of 40 mu of ammonia water was applied to 6 mu of fir seedlings. After 7 days, the growth of seedlings reached 3-4 cm and the growth was vigorous.