摘要
旱作土壤主要是指降水量低(年平均降水量为250—500毫米)或降水虽足(年平均降水量为500—760毫米)但分配不均,又未进行灌溉的土壤。我国旱作土壤占总耕地面积的51.9%。黄土地区除林地、草地均为旱作土壤外,农田的旱作土壤占耕地总面积的80%以上。
The dry soil resources in Loess Region are plenty and they may be divided into three zones:the ultisol type of fertile dry soil zone,the entisol type of eroded dry soil zone and the aridisol type of droughty dry soil zone.The dry soil has less content of organic matter,nitrogen,available nutrient,soil moisture and soil productive forcesthan the irrigated soil,but its available nutrients will not be washed away by downwash,and its ploughing is better than the irrigated soil.For rational utilization of the dry soil,it is advisable to plant forage grass widely,and increase the vegetation to improve the ecological environment of dry soil;enhance the fertility level of dry soil,and raise the per unit yield,make a good job in capital farmland construction;abopt save-water agricultural measures to make good use of soil moisture;and introduce high-yield and drought resistant crops and varieties to best exploit the potential for dry soil production.
作者
彭琳
Peng Lin(Northwestern Institute of Soil and Water Conservation,Academia Sinica,Wugong,Shaanxi Province)
出处
《中国农业科学》
1983年第6期5-10,共6页
Scientia Agricultura Sinica
