Describe the basis and principles of crop layout.

Answer: 1)The demand of the society is the premise of crop layout. Therefore, it is necessary to take into account, comprehensive arrangement; not loose food production, and actively develop a variety of business: to improve the ratio;

2)The ecological adaptability of crops is the basis of crop layout. Therefore, it is necessary to plant according to local conditions and soil.

3)Socio-economic conditions are the guarantee of crop layout. Therefore to scale, specialized production, follow the comprehensive (social, economic, ecological) benefits and the principle of comparative efficiency.