The soil and plants are the important material foundation for mankind’s survival.With the long-term production practice,the ancient working people gradually knew there was the ecological relation of a kind of system between the soil and plants.After the produce of original agriculture,people selected the plants to plant according to local conditions of soil.Throng the intensive and meticulous farming,the ancient people also changed the growth environment and nutrition structure of the crops so as to raise outputs and qualities.At the same time,they improved and raised soil fertility through rotating crop and using green manure,improved saline-alkali soil to raise soil property through planting the crops of alkali resistance,and maintained water and soil through protecting plants and planting the forests and grass.There is a close relation between the soil and the plants,we can make them get benefit for each other by handling the relation between the soil and plants effectively.
