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在一年内,从柳树、白杨、赤杨三种树叶循环所获得的产量、化学成份和营养价值,是值得研究的。这三种树叶的干物质、粗蛋白和粗纤维的含量分别为:柳树叶干物质为23.9—30.7%、粗蛋白为12.4—23.1%、粗纤维为12.9—19.3%;白杨树叶干物质为28.4—34.4%、粗蛋白为20.2—21.0%、粗纤维为14.0—14.1%;赤杨树叶干物质为30.5%、粗蛋白为17.7%、粗纤维为19.6%。柳树叶含鞣酸为4.1%,赤杨树叶含鞣酸为3.4%。这三种树施加氮磷钾肥
Within one year, the yield, chemical composition and nutritional value obtained from the three kinds of leaves of willow, poplar and alder are worth to be studied. The contents of dry matter, crude protein and crude fiber of the three leaves were as follows: dry matter of willow leaves 23.9-30.7%, crude protein 12.4-23.1%, crude fiber 12.9-19.3%, dry matter of poplar leaves 28.4 -34.4% crude protein, 20.2-21.0% crude protein, 14.0-14.1% crude fiber, 30.5% dry alder leaves, 17.7% crude protein and 19.6% crude fiber. Willow leaves contain tannic acid 4.1%, aloe leaves contain tannic acid 3.4%. The three kinds of trees to apply nitrogen, phosphorus and potassium fertilizer