Peanuts have less strict requirements on the soil. In addition to soils that are too viscous, groundnuts can generally be grown in soil. The soil most suitable for peanuts is sandy loam with higher fertility. This kind of soil permeability is good, peanut root system is developed, nodules are more; soil elasticity suitable, is conducive to capsule development, peanut shell smooth, large fruit shape, good quality, high commodity value. For viscous soils, if mulching cultivation is used to keep the soil loose, higher yields can also be achieved. Peanuts are suitable for slightly acidic soils, with a pH of 6.0 to 6.5. The suitable pH for peanut Rhizobia breeding is 5.8 to 6.2, and it is most effective when peanuts are used for the absorption and utilization of phosphate fertilizers with a pH of 5.5 to 7.0 and 6.5. Peanuts are acid-tolerant crops. Soils with a pH of 3.42 can still grow peanuts, but lime must be used. Peanuts do not tolerate salinity, and they are easy to germinate in saline and alkaline lands. The growth of plants is short and the yield is low. Peanuts are hi calcium crops. In the Loess Plateau of northern Shaanxi where the content of calcium carbonate is about 9%, the soil pH is as high as 9 and the output of peanuts per hectare can still reach 4,500 kg.
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