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一、稳定作物布局,为实行轮作奠定基础。作物布局是轮作的前提,轮作是作物布局的实施。只有在布局合理并加以稳定的基础上,才有实行轮作的可能。当然,作物布局是随着国计民生需要、生产条件改变、科学技术发展而有变化的,但一个地区、一个县、一个社队的布局总应相对稳定,不应无休止地扩大某一作物。例如,平原地区的玉米,辽西北的向日葵,适当地扩大面积有利于增加产量和产值,但这种扩大面积又必须以土地、肥水条件、病虫害情况为前提,以合理轮作为保证。绝不能任意扩大,
First, to stabilize the crop layout and lay the foundation for the implementation of rotation. Crop layout is the prerequisite for rotation, crop rotation is the implementation of crop layout. Only when the layout is reasonable and stable is it possible to implement the rotation. Of course, crop layout changes with the needs of national economy and people’s livelihood, changes in production conditions and development of science and technology. However, the layout of a region, county and commune should always be relatively stable and a crop should not be expanded endlessly. For example, corn in the plains and sunflowers in the northwest of Liaoning Province will be conducive to increasing output and output value by expanding the area properly. However, such expansion must be guaranteed on the premise of land, fertilizer and water conditions, pests and diseases, and reasonable rounds. Must not arbitrarily expand,