Soil requirements of Sorghum

Sorghum is a crop that is tolerant to barren and saline-alkali. It has a wide range of adaptation to soil, and a certain yield can be obtained no matter what type of soil it is planted in. However, the yield is the highest in the sandy loam with fertile land, high content of organic matter and good soil structure. Clayey soil, such as extensive soil preparation and more bumps, often results in irregular seedling emergence, which has a large negative force on root growth after emergence and develops in a horizontal direction, which is not conducive to absorbing deep water and nutrients, and the yield is low. Therefore, in order to obtain high yield in planting sorghum in clayey soil, the key is good soil preparation and deep ploughing in order to promote root growth. Sandy soil is beneficial to sorghum seedling emergence, but because of its poor structure and low content of organic matter, it is easy to de-fertilize and senescence early in the later stage, so special attention should be paid to the supply of water and fertilizer in the later stage. Sorghum has strong adaptability to soil acidity and alkalinity, although neutral soil is very good, but both alkaline and acidic soils can be planted. The ability of acid and alkali tolerance varies with different varieties. Generally, the range of acid and alkali tolerance is between 3.1603163nmol / L (pH5.5~8.5), and the suitable acidity and alkalinity is 31.63316.3nmol / L (pH6.5~7.5). It can grow normally on saline-alkali soil with a salt content of 0.5% to 0.9%. It can not only obtain high yield, but also an important biological measure to improve saline-alkali soil. Topography also has an effect on the growth and development of sorghum. In a normal year, sorghum on flat land is better than that on sloping land. However, in rainy years, due to more water in flat land, microbial activity was inhibited and nutrients were lost, which hindered the normal physiological activities of sorghum, while the sloping land was less waterlogged and the yield was better than that in flat land.