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在滨海砂土上的胶树进行4年肥料试验的结果表明,砂土的氮、磷、钾水平都极低。试区氮、磷、钾处理的橡胶幼树,其树围增长量明显地高于氮、磷处理;砂土保肥性能差,氮、钾肥肥效快,但持续时间短,尿素和氯化钾施用后3个月肥效已全部消失。钾肥在盖草带撒施时效果比穴施好。过磷酸钙沟施肥效持久,施肥后半年肥沟土壤速效磷达288ppm,一年后仍达230ppm;从施肥对胶树营养水平的效应速度来看,钾>氮>磷。
Results of a 4-year fertilizer trial of gum trees on coastal sand show that soil nitrogen, phosphorus and potassium levels are extremely low. Compared with nitrogen and phosphorus treatments, the growth of tree saplings in nitrogenous, phosphorus and potassium-treated rubber saplings in the trial area was poor. The fertility of sand was poor and the nitrogen and potassium fertilizers were fast, but the duration was short. Urea and potassium chloride Fertilizer 3 months after application has all disappeared. Potash fertilizer applied in the cover grass than the effect of good facilities. The effect of superphosphate fertilizer on fertilizer application lasts for a long time. After half a year of fertilization, the soil available phosphorus reaches 288ppm and still reaches 230ppm after one year. According to the effect of fertilization on the nutritional level of gum tree, potassium> nitrogen> phosphorus.