Soybean can produce high yield by cutting root and picking heart.

The main results are as follows: 1. Soybean root-cutting and coring high-yield cultivation method of soybean direct seeding, row spacing 50 cm, coring 8 ~ 9 days after sowing, and root cutting on 10 ~ 11 days. When breaking the root, use a thin shovel to shovel off the main root at a depth of about 5 cm underground. The shovel is inserted obliquely and pulled out in situ to avoid shifting the bean seedling and injuring the lateral root. The position of the broken root should be about 2.5 cm under the stem of the bean seedling, too deep and too shallow can not achieve the desired purpose, or even cause dead seedlings.

Second, several problems that should be paid attention to. 1. Density soybean density depends on varieties and cultivation conditions, the general requirement is sparse planting, but if it is too thin, it will not be closed, which not only wastes land, but also can not achieve high yield. If the density is too dense, the ventilation and light transmission is poor, which affects the normal growth and photosynthesis of soybean, and it is prone to rotten leaves and lodging, which can not achieve high yield. The experiment shows that under the condition of middle and upper fertilizer and water, the plant height of Ludou No. 4 can be controlled at about 80 cm, with row spacing of 50 cm and hole spacing of 20 cm. This mode can be broadcast in holes or in strips. two。 According to the test, the suitable time for heart extraction is 8 ~ 9 days after sowing. This depends on the depth of sowing and the temperature, as well as spring or summer sowing and other specific conditions. Generally speaking, it depends on the growth of the true leaves after the bean seedlings are unearthed. As long as the real leaves have not yet unfolded, they can be removed as soon as possible. Do not damage cotyledons when coring, so as not to affect the growth of lateral buds. Picking the heart at the right time can grow two sturdy and symmetrical main branches. When the coring is too late or slightly inappropriate, the main branch grows poorly or one strong and one weak, and some even grow only one main branch, which can not achieve the effect of high yield. 3. Seedling transplanting soybean seedling transplanting can properly cut the root and pick the heart, but the root cutting of direct seeding in the field is not easy to grasp the depth, such as sufficient time in spring, can also raise seedlings first. Although summer is the busy season of farming, such as raising seedlings 15 days before wheat harvest, cutting roots and picking the heart, and transplanting after wheat harvest, the harvest time can be 15-20 days earlier than that of conventional cultivation, which is not only convenient for soil preparation and fertilization, but also does not mistakenly plant wheat. Seedling transplanting can plant the nutrition bowl of good seedlings directly into the field, and seedling bed can shovel and transplant bean seedlings from the sand layer. After planting, the survival rate can reach 98% to 100% after proper watering. When raising seedlings in a nutrition bowl, the method of root cutting is to cut off the main root outside the bottom of the nutrition bowl 10 days after sowing, and then put it back to the original place; the seedling bed can be raised with a self-made steel wire saw (a bow tool with thin steel wire) pulled along the sand layer from one end of the seedling bed, and the root cutting process can be completed.