According to the characteristics of the varieties, the density of the plant type should be compact and the lodging-resistant varieties should be dense. The varieties with flat planting and poor lodging resistance should be thin; the variety with long growth period should be thin and the variety with short growth period should be dense; the big spike variety should be thin. Medium and small spike varieties should be dense; tall cultivars should be thin, and dwarf varieties should be dense. Generally, middle and late mature hybrids have a suitable density of 3500-4500 strains/mu, medium-maturing hybrids 4000-5000 strains/mu, medium-early-maturing hybrids 4500-5500 plants/mu, and early-maturing hybrids 5500-6000 plants/mu.
According to the determination of soil fertility, the soil fertility is lower, the fertilization amount is less, the lower limit value of the suitable density range of the variety is taken, and the high-yield field with high soil fertility and high fertilization level is taken as the upper limit value of the suitable density range; the medium fertility is Take the average of the appropriate density range of the species.
According to the moisture condition, the annual rainfall in the northern spring corn area is 469 mm in average, and the 90% confidence interval is 383-555 mm, increasing from west to east and from north to south. No irrigation, poor water conditions should be thin; there is appropriate irrigation and water conditions suitable.
According to the terrain to determine the density of terraces or land parcels, long, well-ventilated and light-transmitting land conditions can increase the density; otherwise, reduce the density.
Density determined according to light conditions Northern Shaanxi, Ningxia, and central and western Inner Mongolia have better lighting conditions, with an increase of 500 trees per acre.
Appropriate increase in sowing rate for mechanical sowing In order to avoid mechanical damage and the lack of density caused by pests and diseases, it is necessary to increase the seeding amount by 5%-10% on the basis of appropriate density.
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