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桤木(Ainus Cremastogyne Burk)属桦木科落叶乔木。既是速生用材树,又是很好的肥料树。生长快,10年生树高12—15米,胸径14—16厘米。五年生桤木幼树,每株平均每年可采鲜叶1—2斤,积落叶0.5—1斤。盐亭县林山公社,营造桤柏混交林12,000亩,3年后利用桤木叶作肥料300多万斤,相当于100多吨硫酸铵,粮食产量比造林前增加60%以上。一、养分含量根据我们采叶分析结果(表一),清明前后(4月)采摘的树叶养
Ainus Cremastogyne Burk is a birch deciduous tree. It is both a fast-growing timber tree and a very good fertilizer tree. Grow fast, 10-year-old trees 12-15 meters high, diameter 14-16 cm. Five-year-old alder sapling, the average annual per 1-2 acres of fresh leaves can be taken, the plot leaves 0.5-1 kg. Yanting County, Lin Shan commune, to create a mixed cypress 12,000 mu, 3 years after the use of alder leaves as fertilizer more than 300 kilograms, equivalent to more than 100 tons of ammonium sulfate, grain output increased by more than 60% before afforestation. First, the nutrient content According to our analysis of leaf harvesting results (Table 1), Qingming before and after (April) picked leaves