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1975年冬,在灌县灵岩山下部,海拔高800米,坡向北偏东,坡度26度的地方栽植毛泡桐Paulownin tomentosa(Thunb)Steua和毛桐变种光叶泡桐p.tomentosaVar.tsinlingesus(pai)Gohgtohg株行距3.3×3.3米,每亩60株.灌县年平均温度15.1℃,极端最高温度33.6℃,极端最低温度—5℃,年降雨量1391.3毫米,相对湿度80%,光照1155.7小时,无霜期269天,土壤为黄壤,厚度1.2米左右,酸性.
In the winter of 1975, in the lower part of Lingyanshan of Guanxian County, 800 meters above sea level, Paulownin tomentosa (Thunb) Steua and Paulownia variant Paulownia pt.tomentosaVar.tsinlingesus (pai ) Gohgtohg strain spacing of 3.3 × 3.3 meters, 60 per mu. Irrigation County annual average temperature of 15.1 ℃, extreme maximum temperature of 33.6 ℃, extreme minimum temperature of -5 ℃, annual rainfall of 1391.3 mm, relative humidity of 80%, light 1155.7 hours, 269 days frost-free period, the soil is yellow soil, the thickness of about 1.2 meters, acidic.