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1997-2001年我们在桂花林场进行了杉木近熟林垦复施肥试验。结果表明:施尿素无论是对材积生长的影响还是在经济效益上,效果最好。对材积生长的影响,施钙镁磷肥、施氯化钾肥不如施尿素好;尿素与钙镁磷肥混施、尿素与氯化钾混施的效果也不如单施尿素好;氯化钾用量偏大时,对杉木材积生长有不利影响。经济效益上施尿素的投入/产出在1/5左右,施钙镁磷肥、施氯化钾、尿素与钙镁磷肥混施、尿素与氯化钾混施效果均不如施尿素好。因此,对近熟林施氮肥是值得肯定的,具有可观的经济效益。
1997-2001 we Guihua forest farm near fir forest reclamation fertilization experiment. The results showed that applying urea exerts the best effect on the volume growth or economic benefits. The impact of volume growth, applied calcium phosphate, potassium chloride fertilizer is better than urea; urea and calcium magnesium phosphate mixed, urea and potassium chloride mixed effect is not as good as single urea; potassium chloride is too large When the volume of Chinese fir growth has a negative impact. Economic benefits on urea input / output in about 1/5, Shi calcium magnesium phosphate fertilizer, potassium chloride, urea and calcium magnesium phosphate mixture, urea and potassium chloride mixed effect is not as good as urea. Therefore, the near-mature forest nitrogen fertilizer is worthy of recognition, with considerable economic benefits.