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本文根据十多年来施肥的试验和调查结果对杉木的施肥问题提出了一些不同的看法,以供读者参考: 一、杉木苗期一般不需施用氮素化肥,施肥后的苗木虽然规格有所提高,但造林后的生长量并没提高,只有自然分化的苗木造林后才有生长差异。 二、杉木幼林施用有机肥、短期套种绿肥、“撩壕”造林等措施,在黄红壤幼林初期生长有效,在老红壤长期有效,在乌红壤上基本无效。 三、杉木幼林施用氮素化肥无效,施磷肥初期有效,施钾肥呈负效。
Based on more than ten years of fertilization experiment and survey results, we put forward some different opinions on the fertilization of Cunninghamia lanceolata for the readers’ reference: First, the seedlings of Chinese fir need not be treated with nitrogenous fertilizers at all. Increase, but the growth after afforestation did not increase, only the natural differentiation of seedlings have growth difference after afforestation. Second, the application of organic fertilizer in young Chinese fir plantation, short-term intercropping of green manure and “rearing moat” afforestation were effective in early growth of young yellow-red soil and long-term in old red soils. Third, the application of nitrogen fertilizer young plantations invalid, early application of phosphate fertilizer, potassium application was negative effect.