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本试验的措施是秋末通过大穴(1×1×1米)深翻,冻垡后春季回土造林,按L~3(2~7)正交表对有机肥、氮、磷、钾肥进行排列。选用当地适生的Ⅰ—69杨作为改土培肥的指示树种。三年试验结果表明:造林的第一年施肥效应不显著,但大穴整地造林和小穴整地造林相比,胸径生长量增加19.8％,树高增加91.8％;在后两年中,氮肥和有机肥的效应显著;另外,在施用有机肥、氮肥或磷肥的小区,其叶片的氮、磷含量显著高于其他小区;大穴深翻整地的效应,随着树木的生长有逐渐降低的趋势;通过对各处理经济效益的分析与评估,得出大穴整地+底肥+氮肥+钾肥处理效益最高,三年中投入与产出比为1:3.11,投入计息与产出比为1:2.67。
In this experiment, deep-plowing (1 × 1 × 1 m) deep plowing was applied in the late autumn. Soil was re-affixed in the spring after frozen pudding. Organic fertilizers, nitrogen, phosphorus and potassium fertilizers were arranged according to L ~ 3 (2 ~ 7) . The selection of local suitable for Ⅰ-69 Yang as soil improvement fertilizer instructions tree species. The results of three years showed that the fertilization effect was not significant in the first year of afforestation, but the growth of DBH increased by 19.8% and the tree height increased by 91.8% as compared with that of small hole afforestation. In the last two years, nitrogen and organic fertilizer In addition, the nitrogen and phosphorus content of the leaves in the communities with organic manure, nitrogen fertilizer or phosphate fertilizer were significantly higher than those in other communities. The effect of deep pothole turning-in gradually decreased with the growth of trees. The analysis and evaluation of the economic benefits of each treatment showed that the treatment of big hole preparation + base fertilizer + nitrogen fertilizer + potassium fertilizer had the highest benefit, the ratio of input to output was 1: 3.11 in three years, and the ratio of interest income to output was 1: 2.67.