Why soybean root cutting and pinching can increase yield

1. High-yield cultivation method for soybean by root cutting and pinching: Direct sow soybeans with a row spacing of 50 cm. On the 8th to 9th day after sowing, carry out pinching; on the 10th to 11th day, carry out root cutting. When cutting roots, use a thin iron shovel to cut the main root at a depth of about 5 cm below the soybean seedling. Insert the shovel at an angle and pull it out from the same position to avoid displacing the soybean seedling and damaging the lateral roots. The root cutting position should be controlled at about 2.5 cm below the soybean seedling stem. Too deep or too shallow will fail to achieve the expected purpose and may even cause seedling death.

2. Several issues to note 1. Density: Soybean density should be determined according to the variety and cultivation conditions. The general requirement is sparse planting, but if too sparse, the rows will not close, which not only wastes land but also fails to achieve a high-yield effect. If too dense, ventilation and light transmission will be poor, affecting the normal growth and photosynthesis of soybeans, and it is also prone to leaf rot and lodging, also failing to achieve a high-yield effect. Experiments have shown that under medium-to-high fertility and water conditions, the plant height of Ludou No. 4 can be controlled at about 80 cm, with a row spacing of 50 cm and a hole spacing of 20 cm as suitable. This model can be sown in holes or in drills. 2. Pinching time: Tests have shown that the 8th to 9th day after sowing is suitable. This should be determined according to the sowing depth, temperature, and whether it is spring sowing or summer sowing. In general, it depends on the growth of the true leaves after the soybean seedlings emerge. As long as the true leaves have grown out but not yet unfolded, they can be removed, and the earlier the better. When pinching, do not damage the cotyledons, so as not to affect the growth of lateral buds. Timely pinching can produce two thick and symmetrical main branches. If pinching is too late or slightly mistimed, the main branches will grow poorly or one will be strong and the other weak, and some may even grow only one main branch, failing to achieve a high-yield effect. 3. Raising seedlings and transplanting: Raising soybean seedlings and transplanting can properly carry out root cutting and pinching, while root cutting in direct field sowing is not easy to control in depth. If there is sufficient time in spring, seedlings can also be raised first. Although summer is a busy farming season, if seedlings are raised 15 days before wheat harvest, and root cutting and pinching are carried out, then transplanting after wheat harvest can seize the farming season. The harvest period can be 15 to 20 days earlier than conventional cultivation, which is convenient for land preparation and fertilization and does not delay wheat planting. For seedling raising and transplanting, the well-raised seedlings in nutrient pots can be directly planted into the field. For seedbed seedling raising, the soybean seedlings can be lifted from the sand layer and transplanted. After planting, water appropriately, and the survival rate can reach 98% to 100%. When raising seedlings in nutrient pots, the method of root cutting is to cut off the main root that has grown out of the bottom of the nutrient pot 10 days after sowing, then put it back in place; for seedbed seedling raising, a self-made steel wire saw (a bow-shaped tool with fine steel wire stretched tight) can be pulled from one end of the seedbed along the sand layer to complete the root cutting procedure.