Density is determined according to the variety characteristics. The plant type is compact and the lodging-resistance variety should be dense. The variety 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 suitable for thinning, medium and small panicle types. The varieties should be dense; the tall cultivars should be thin and the dwarf varieties should be dense. Generally, middle-late-maturing hybrids have a suitable density of 3500-4500 plants/mu, medium-maturing hybrids 4000-5000 plants/mu, medium-early-maturing hybrids 4500-500 plants/mu, and early-maturing hybrids 5500-6000 plants/mu. Determine density based on soil fertility. Soil fertility is low, fertilization is less, the lower limit value of the suitable density range of the variety is taken; high-yield field with high soil fertility and high fertilization level is taken as the upper limit value of the suitable density range; the appropriate density range of medium fertility is taken. average of. Determine the density based on moisture conditions. The annual rainfall in the northern spring corn area averages 469 millimeters with a 90% confidence interval of 383 to 555 millimeters, 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. Determine the density according to the terrain. In the terraced fields or parcels of land that are long and narrow, with good ventilation and light transmission conditions, the density can be appropriately increased; otherwise, the density should be appropriately reduced. Density is determined based on lighting conditions. Northern Shaanxi, Ningxia and Inner Mongolia have better light conditions and can increase 500 trees per acre. Machine broadcast should increase the broadcast volume appropriately. 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% to 10% based on the appropriate density. High Pressure Extension Tubings High Pressure Extension Tubings,high pressure PVC extension tube,Extension Tubings,extension tube medical Anesthesia Medical Co., Ltd. , https://www.trustfulmedical.com