客土改良对土壤质地及烟株生长发育的影响

目的]通过对四川凉山地区质地黏重的红壤中掺入砂性客土的改良试验,研究客土改良对红壤质地及烟株生长发育的影响规律。方法]加入砂土的比例分别为10%、30%、50%、100%、0(不加砂性客土的对照)。结果]在质地黏重的红壤中掺入砂性客土,随掺客土量的增加,土壤pH呈上升趋势,土壤有机质、碱解氮含量呈下降趋势;掺客土10%有利于土壤速效磷的释放,掺客土10%和30%则有利于速效钾的释放;随土壤掺砂量增加,烟株生育期天数逐渐减少,掺砂50%处理能够获得最高的中上等烟比例,而掺砂10%处理处理可以获得最大的产量和产值。结论]该研究可为四川凉山地区利用砂性客土改良红壤土质提供科学依据。

Effects of Sandy Soil Exchange on Soil Texture and Tobacco Growth and Development

Objective] The aim was to study the influencing law of sandy soil exchange on red soil texture and tobacco growth and development by the soil texture modifying experiments of adding into sandy soil in heavy texture red soil in Liangshan area of Sichuan.Method] The adding percentage of sandy soil was 10%,30%,50%,100%,resp.,and taking no sandy soil as control.Result] The results indicated that pH value of heavy red soil showed an increasing tendency,while organic matter and available nitrogen contents showed a decreasing tendency along with the quantity of exchanged soil increasing.It was beneficial to release the available phosphorus through 10% percentage soil exchanged,meanwhile it was beneficial to release available potassium through 10% and 30% percentage soil exchanged.The days of tobacco growth period decreased gradually with the quantity of soil exchanged increasing,the best ratio of high middle class flue-cured tobacco leaf could be harvested through half soil-sand exchanged.And the top yield and value per mu would be achieved through ten percentage soil-sand exchanged.Conclusion] The study provides a scientific basis for using sandy soil to modify red soil in Liangshan area of Sichuan.