(1) Corn is a single crop with a single ear and poor panicle regulation ability. For crops with strong tillering or branching, such as wheat, their tillers can be spiked, and the number of spikes is automatically adjusted. The amount of spikes formed is relatively close, and a higher yield is obtained. However, the corn varieties currently promoted rarely have tillers, mostly one and one ear, although sometimes individual plants can form two ears.
But the number is too small. The automatic adjustment ability of the number of ears of corn is too poor. Basically, the number of seedlings is the number of spikes at harvest, and sometimes the number of spikes harvested is often less than the damage caused by pests and diseases, the damage of management process, and other reasons. The number of seedlings left. Therefore, corn is more important than crops such as wheat, rice, cotton, and soybean by increasing the number of plants.
(2), the yield of corn single ear is high. The grain weight of wheat single ear is about 1 gram, and the grain weight of common corn ear is 130-150 grams. If 1 mu of land, wheat receives less than 1000 spikes, only 1 kilogram of yield reduction, and if corn receives less than 1000 spikes, it will reduce production by 130 to 150 kilograms. As a result, the reduction in the yield of corn is much greater than that of wheat and other crops. Therefore, for corn to be productive, it must be ensured that enough spikes are harvested per acre.
(3) Requirements for the characteristics of corn varieties. The improved varieties of corn selected by corn breeders have gradually changed from flat to compact, especially for compact large spikes. These varieties are suitable for close planting, and only at higher densities can the high yield potential of excellent varieties be achieved and the purpose of yield increase can be achieved. If the number of species is not enough, not only can not increase production, but reduce production.
(4) Requirements for continuous improvement of soil fertility level. With the development of production, the application amount and types of chemical fertilizers have gradually increased, and the irrigated area has expanded year by year. Under high-fertilizer conditions, if the density of the species is not enough, it will cause waste of fertilizer and water. Moreover, the corn has no tillering, and it will not cause the lodging to reduce the production due to excessive tillering of the ground manure. It is necessary to increase the amount of sowing and increase the density in order to exert the effect of the ground force and achieve high yield.
(5) The number of plants planted is easier to control. The yield per acre of corn is the product of the number of pans per acre, the average number of grains per panicle, and the average grain weight. Any one of them will increase, and the other two will increase. Yield. The number of grains per panicle and grain weight are greatly affected by environmental conditions and comprehensive cultivation measures, and some conditions are difficult to manipulate. The number of spikes per acre is mainly determined by the density of planting and the number of seedlings kept, which is easy to control and operate. Therefore, it is easier to achieve high yield and stability by increasing the planting density than by increasing the grain number and grain weight through cultivation measures.
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