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我县地处渭北高原,气候干燥,境内沟壑纵横,水土流失严重,海拔440—1300米,地下水位100—180米,大部分地区无灌溉条件。据1962～1977年气象资料记载,年平均气温11.4℃,极端最高气温40.1℃,最低气温-20.1℃,平均全年日照时数2480,无霜期193天,降水量563.5毫米。基本适应泡桐的生长发育,但由于受季风的影响,常出现春旱和伏旱,给泡桐生产带来一定威胁。我县自1965年引进泡桐后,群众在实践中总结出了一套泡桐旱地埋根育苗的技术措施,保证了泡桐生产的大发展。现在,全县泡桐育苗面积9053亩;栽植株数达867万多株,人均25株,泡桐已成为我县四旁绿化和方田林网化的主要树种。现将泡桐埋根育苗中具体做法介绍如下:
My county is located in the Weibei Plateau, dry climate, vertical and horizontal ravines, severe soil erosion, elevation 440-1300 meters, groundwater level 100-180 meters, most areas without irrigation conditions. According to the meteorological data from 1962 to 1977, the annual average temperature is 11.4 ℃, the extreme maximum temperature is 40.1 ℃, the minimum temperature is -20.1 ℃, the average annual sunshine duration is 2480, the frost-free period is 193 days and the precipitation is 563.5 mm. Basically adapt to the growth and development of Paulownia, but due to the monsoon, spring drought and drought often appear, to bring a certain threat to Paulownia production. After the introduction of Paulownia in our county in 1965, the masses summed up a set of technical measures of planting root-inducing seedlings in dryland of Paulownia to ensure the great development of Paulownia production. Now, the county Paulownia nursery area of 9053 acres; planting more than 8670000 strains of plants, 25 per capita, Paulownia has become the four sides of the county afforestation and Fangtianlin network of the main tree species. Now Paulownia root nursery specific practices described below: