Moisture and humidity: After soil preparation, the soil moisture content (dry soil weight%) should be about 22% when sowing, so as to ensure that seeds can normally absorb water and germinate. Seed germination needs more water, and the soil water content is required to be 70%-80% at flowering stage, otherwise it will increase the bud drop rate. The amount of fertilizer absorbed by soybean before flowering is less than 15% of the total absorption, while the flowering and pod-setting period accounts for more than 80% of the total absorption.
Sowing in time: Sowing soybeans in summer can be done after wheat is harvested as long as the water content is suitable. The best sowing date is June 10 ~ 25, and no later than early July.
Extended data:
I. Geographical distribution
Soybean originated in China. It is cultivated all over China, among which Heilongjiang soybean is the most famous and widely cultivated all over the world.
Second, cultivation management.
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 more than 20 kg of diammonium phosphate is applied every 667 square meters, it can be applied in layers: the upper layer of seed fertilizer is 5-7 cm deep, and the fertilization amount 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.
Third, the efficacy of soybeans.
1, eat beans and bean products for beauty.
Tofu contains many important chemical nutrients, such as soybean isoflavones. Soybean isoflavone has certain anti-aging effect and can improve dry and rough skin.
It can be proved that eating beans and bean products often has a certain cosmetic effect. Soybean isoflavone is a water-soluble substance, which is easily absorbed and utilized by human body. Therefore, low-temperature stewing is often recommended.
2. Prevent "three highs" and osteoporosis.
Soybean isoflavones have significant antioxidant effect, which can help the metabolism of oxidative free radicals in the body, thus preventing cardiovascular and cerebrovascular diseases and cancer. There is also a phytoestrogen in beans and their products, that is lignans. Lignans and soybean isoflavones have similar effects, and their effects of preventing osteoporosis, antioxidation and cardiovascular and cerebrovascular diseases have been confirmed.
3. The best companion for menopausal women.
Soybean isoflavones have a particularly significant effect on women. Studies have shown that women's estrogen level drops sharply after menopause, which is very easy to suffer from osteoporosis. Soybean isoflavones rich in beans and bean products can alleviate osteoporosis, and eating such foods often has a good preventive effect.
Baidu encyclopedia-soybean
People's Network-How to eat soybeans? Eating more soybeans has three advantages.