Soybean is the most important bean in panicum miliaceum and the world. Soybean originated in China. Most domestic scholars believe that it originated from Yunnan-Guizhou Plateau, and many botanists believe that it originated from Ussuri soybean in China. Nowadays, cultivated soybeans are cultivated from wild soybeans through long-term directional selection, improvement and domestication.
Soybean originated in China, which can be proved by a large number of ancient documents in China. China has been cultivated since ancient times, with a history of 5,000 years. Widely planted in China, it is produced in Northeast China, North China, Sichuan and the lower reaches of the Yangtze River. It is cultivated in the Yangtze River valley and southwest China, and the quality of soybeans in the northeast is the best. However, the prices are different, some areas are cheap, and some areas are rising.
Cultivation techniques of soybean
Fertilization method: Under normal circumstances, fertilizer seeds are applied separately at 4-5 cm below the seed side, and the amount of fertilizer can be adjusted. When diammonium phosphate is applied more than 20kg per 667m2, it can be applied in layers. The upper layer is 5-7 cm deep, and the fertilization rate accounts for1/3; The depth of base fertilizer 10- 16 cm, and the amount of fertilizer applied accounted for 2/3. Or after the previous crop is harvested, spread the fermented organic fertilizer evenly on the ground, then rake the fertilizer into the soil with a rake, fully mix the manure with the soil, and then dig it deeply, and the raked bottle is finely ridged, or plant soybeans flat.
Sowing in time: Sow summer soybeans after wheat harvest as long as the water content is suitable. The best sowing date is June 10 ~ 25, and no later than early July.
Soil moisture: After soil preparation, the soil moisture (dry soil weight%) should be about 22% when sowing, so as to ensure that seeds can normally absorb water and germinate.