What is the best time to plant soybeans around summer solstice? What is the reason?

What is the best time to plant soybeans around summer solstice? What is the reason? The planting area of soybean is very wide, and the climatic conditions in various regions determine the sowing date of soybean. Taking the planting time of summer soybeans in the Huang-Huai-Hai region as an example, there are some local sayings, such as "planting soybeans three days from summer to Sunday", "planting sesame seeds on the ear" and "planting soybeans three days in first frost", that is, three days before and after summer is the golden season for planting soybeans in this region.

1. After wheat harvest, you can sow soybeans with water as long as there is water in the soil to prevent rain. In fact, it is also important to plant soybeans before and after the rain. There is a local agricultural proverb that says, "When corn is planted before rain, soybeans are planted after rain, and farmers celebrate the harvest in advance", that is to say, corn can be dried and sown before rain, and germination after rain is ideal, but soybeans should be sown after rain, otherwise heavy rain will harden the soil surface, thus affecting the emergence of soybeans. In short, soybeans should not be sown too early. If sown too early, it is easy to grow, prolong the growth cycle, increase the growth risk, and lead to pod thinning. However, the reproductive growth of soybean in the suitable sowing period conforms to the normal law, and generally it can obtain better yield without too many external factors.

2. Sowing method: There is a very popular agricultural proverb about sowing soybeans, which is called "bare beans bury wheat", "three-fingered wheat, two-fingered beans", and there is also a proverb "If you want all bean sprouts, you can plant them on the ground". In other words, it is not easy to sow wheat too deep, but it is not necessary to sow soybeans too deep. The surface layer can be covered with a layer of soil. Even "May beans (lunar calendar), half exposed" will not affect the normal emergence. This is because the "strength" of soybean emergence is weak. Sowing too deep will cause the soil at the top of bean sprouts to be pressed. Once the soil layer is impermeable, it is easy to cause weak seedlings or no seedlings.

3. Seed treatment: In order to solve the harm of soybean root rot, virus disease, bee disease (the culprit of soybean late maturity, with pods but no seeds) and tobacco planthopper, promote the growth of soybean seedlings and improve the seed setting rate, farmers with planting experience often coat soybean seeds before planting soybeans.