为了使杉苗获得足够的养分,促进苗木生长、提高苗木的质量和产量,就要对杉苗进行施肥。要做到合理施肥,主要的是要做好看苗施肥,看土施肥和看天施肥。看苗施肥:一般苗木以氮肥为主,磷钾肥为辅。一年生杉苗每用氮1 3一18斤、磷4—8斤、钾5—7斤,根据杉苗各个生长时期,采取前期轻、中期重、后期控的施肥 In order to obtain sufficient nutrients fir seedlings, promote seedling growth, improve seedling quality and yield, it is necessary for fir seedlings fertilization. To achieve reasonable fertilization, the main thing is to do a good job Miao fertilizers, soil fertilizers and see fertilizers days. See Miao fertilization: The general nitrogen-based seedlings, phosphorus and potassium supplemented. Annual fir seedlings per 1 3 a 18 kg of nitrogen, phosphorus 4-8 kg, potassium 5-7 kg, according to the growth of fir seedlings to take the early light, medium heavy, late control fertilization