in huaibei area the unsuitable application of wheat variety, bad climate soil conditions, lower fertility and extensive cultivation were major limiting factors for high wheat yield in large areas.
with speeding up the course of the urbanization in our country, the way of the land use is during the transitional period from extensive cultivation to the intensive connotation.
伴随着我国城镇化进程的加快,城镇土地的利用方式正处于粗放外延向集约内涵转化的关键时期。
the thesis thinks the excessive deterioration of ecological environment was mainly caused by the extensive cultivation of the shed people.