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杉树造林后的早期生长,是速生丰产的重要阶段,采用施肥措施促进幼树生长,以探索速生途径.一、试验区概况试验区在江津县海拔1117米.年均温13.0℃,积温4966.8℃,雨量1550毫米,无霜期278天.黄壤,PH6,立地指数12.5.造林前以60×60×30厘米的块状整地,1983年11月用当年生苗造林,苗均高15厘米,1984年5月初施N·P·K复合肥25亩,邻近26亩不施肥作对照.二、试验方法及结果每株施肥15克左右,置幼树上方10厘米处,埋深5厘米.1984年11月上旬在试验和对照
The early growth after the afforestation of the fir is an important stage of fast-growing and high-yielding, and the fertilization measures are used to promote the growth of the saplings to explore the fast-growing ways.First, the experimental area The experimental area is 1117 meters above sea level in Jiangjin County with annual average temperature of 13.0 ℃ and accumulated temperature of 4966.8 ℃, rainfall 1550 mm, frost-free period 278 days. Yellow soil, PH6, site index 12.5. Before afforestation with 60 × 60 × 30 cm block preparation, in November 1983 with the current seedling afforestation, seedling average height 15 cm, 1984 In early May, 25 mu of NPK compound fertilizer was applied, and 26 mu of non-fertilization fertilizer was used as a control nearby. 二, Test Methods and Results Fertilizing about 15 grams per plant, placing 10 cm above the sapling tree with a depth of 5 cm. 1984 11 In early months in the trial and control