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油桐适合在具有一定肥力的中性至微酸性土壤上生长,土壤pH值低于4.5则生长不良,产量低。我省油桐分布的相当一部分地区属于酸性土壤,这有碍于产量的提高。为了改善油桐林地的土壤酸碱度条件,我们在贵阳市乌当区下坝乡对酸性土壤上的油桐林进行了施用石灰的试验。试验结果达到了预期目的。一、试验地概况试验地设在海拔1,070米的南坡,坡度15—20°;年均气温15.4℃,≥10℃积温4,850℃,年降水量1,100毫米;土壤为石灰岩上堆积物发育的黄壤,土层较薄,质地较粘重,试验前土壤的养分状况见表1。
Tung oil is suitable for growing on neutral to slightly acidic soil with a certain fertility. When the soil pH is below 4.5, the growth is poor and the yield is low. A considerable part of our province tung oil distribution of acidic soil, which hindered the increase in production. In order to improve the soil pH of tung oil wood, we conducted a trial of applying lime to tung oil tree in acidic soil in Xiaba, Wudang District, Guiyang. The test result has achieved the anticipated goal. First, the test site Overview Experimental site located at 1,070 meters above sea level on the southern slope, slope 15-20 °; average annual temperature of 15.4 ℃, ≥ 10 ℃ accumulated temperature 4,850 ℃, the annual rainfall of 1,100 mm; soil limestone deposits on the development of yellow soil , Soil thinner, more sticky texture, soil nutrient status before the test in Table 1.