The production of common corn intercropping, such as corn and soybean intercropping, corn and peanut intercropping, potato and corn intercropping, wheat and corn intercropping, etc., has become a corn producing areas to improve land utilization, to promote high crop yield, high efficiency, sustained increase in production of important technical measures. Its advantages are:

(1) fully utilize light, heat, water, soil and other natural resources and labor resources, to achieve increased production and efficiency

①Intercropping can improve the field environment, make full use of environmental resources. For example, the potato maize intercropping, in the potato blossom, potato, afraid of high temperatures, need a moist environment, and this is the set of maize knuckle pregnant period, the growth of a larger amount of potato can play a shade, cooling effect, thus weakening the degradation of the potato; to be harvested after the maturity of the potato, but also for the maize to create a ventilated and light-permeable conditions conducive to the growth of maize.

②Play marginal effect, the use of side row advantage. For example, wheat and corn planting, wheat sowing early, harvest early, corn is the opposite. Before the wheat grout, corn in the seedling stage, the plant is short, the corn belt becomes the wheat ventilation and light channel. The marginal effect of wheat in the side rows is obvious. When the corn plant height exceeds the wheat, especially after the wheat harvest, the wheat belt becomes the ventilation and light transmission channel of the corn, and the ventilation and light transmission conditions of the corn are improved again.

③Make full use of the growing season. In terms of the growing season in northern China and southern Northeast China, most of the planting of one season crop surplus, planting two seasons crop shortage. Usually early spring crops and large fall crops in the same set on the ground, the two crops convergence, neither waste of the growing season, but also a double harvest. For example, spring wheat and corn inter-set planting, than the clear planting of corn one month earlier than the use of land. At the same time the two crops in the reproductive period of light, temperature, water, fertilizer and other differences in demand for conditions, seedling, peak and late, alternating, you can avoid each other's competition, more fully utilize the heat resources of the growing season.

④Regulation of stubble. Crops can not only improve the yield of the crop, but also because of the early sowing and harvesting than the stubble replanting, to regulate stubble, ease the season and labor and water and fertilizer management and many other contradictions.

(2) stable harvest

Different crops have different ability to withstand natural disasters, reasonable inter, mixed, sets of crops can be utilized within the composite group of crops with different characteristics, to enhance the resistance to weather disasters. Such as in the typhoon and hailstorm-prone areas, corn and sweet potato can be used for intercropping, in the wind and hail damage, corn may be a substantial reduction in yield or even harvest, but sweet potato can ensure a certain yield, to ensure that the composite group of stable production and income. Corn and cabbage intercropping can reduce the latter's pests and diseases, to achieve stable production and income.

(3) is conducive to easing the contradiction between crops competing for land, and realizing multi-crop production and income

China's agriculture is a resource-constrained, people, land, food, capital in the existing level of technology can not be completely resolved. Only the rational use of intercropping, the implementation of a variety of multiple income, in order to ease the grain, cotton, feed, fertilizer competition for the contradiction of the land, and to promote the soil with the combination of nutrition, thereby reducing the pressure of people, land, food, money, and to promote the rational adjustment of the agricultural structure and the sustainable and stable development of agricultural production.