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１９９０～１９９２年在隆昌县境内重壤质山地黄壤上进行肥料试验。结果表明，不同施肥处理在树高、胸径、地径的生长量方面的差异都极显著，最佳处理比ＣＫ树高相对生长量增８０～１６６％，火炬松叶黄化率和落叶量减少。施Ｎ处理开始使土壤全Ｎ略增，尔后则下降。土壤有效磷因施磷肥而增加，叶片吸磷与施磷肥量呈正相关。叶片中钙量呈逐年降低趋势，镁则逐年积累，氟和硫大量超标，污染严重。
From 1990 to 1992, fertilizers were tested on yellow soil of loamy mountainous area in Longchang County. The results showed that there were significant differences in the growth of tree height, diameter at breast height and diameter between different fertilization treatments. The optimum growth rate was 80% ~ 166% higher than that of CK and the decrease of yellowing rate and deciduous leaf of loblolly pine . Application of N treatment began to make soil N slightly increased, then declined. Soil available phosphorus increased due to application of phosphorus, leaf phosphorus uptake and application of phosphorus was positively correlated. Leaf calcium content showed a trend of declining year by year, magnesium is accumulated year by year, a large number of fluorine and sulfur exceeded, serious pollution.