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从１９８６年起至１９９２年在我省珙县和纳溪进行了杉木人工林施肥试验。试验处理包括施肥种类（Ｎ、Ｐ及Ｎ＋Ｐ）和施肥剂量。以胸径生长量、树高生长量和材积生长量为指标分析了施肥效果；采用线性模型进行了统计检验。试验结果表明，合理的施肥措施（例如施适量氮磷复合肥）对杉木生长有明显增益作用，可以获得显著经济效益，其增益产值与投入现值之比在２以上，最高可达７；平均年增益产值为３００元／ｈａ──９００元／ｈａ。
From 1986 to 1992 in China’s Lixian County and Naxi fir plantation fertilizer test. Test treatments included fertilizing species (N, P and N + P) and fertilizing dose. The effect of fertilization on DBH growth, tree height growth and volume growth was analyzed. The linear regression model was used for statistical tests. The results showed that reasonable fertilization (for example, application of N and P fertilizer) had obvious beneficial effect on the growth of Chinese fir and significant economic benefits could be obtained. The ratio of gain to input value was above 2 and the maximum was 7. Average Annual output value of 300 yuan / ha ─ ─ 900 yuan / ha.