论文部分内容阅读
1育苗地的选择大青杨播种地必须要选择在地势平坦 ,水源充足 ,排水良好 ,土层深厚 ,土壤肥沃 ,地下水位在 1ｍ以下的沙壤土上育苗。如果选择地势低洼 ,土质粘重 ,雨季积水 ,地下水位高的地方育苗 ,苗木生长较弱 ,易感染病虫害。所以 ,选择育苗地是夺取苗木丰产的关键 ,也是决定
A selection of nursery grounds Daqing Yang sowing must be selected in flat terrain, adequate water, well drained, deep soil, fertile soil, groundwater table in sandy loam soil nursery below 1m. If you choose low-lying low-lying, soil sticky, rainy season water, high groundwater nursery, seedling growth is weak, susceptible to pests and diseases. Therefore, the selection of nursery stock is to seize the key to seedling yield is also a decision