1. Root off the edge. The more soybean roots, the greater the area that absorbs nutrients in the soil, and the more beneficial it is to increase production. For this reason, the method of cutting off the roots can be adopted to promote multiple secondary roots. The specific method is: When the seedlings grow two opposite leaves; with a spatula 6 cm away from the tree and the ground into a 60-angle oblique cut, cut off its lateral roots and main root. In this operation, one should pay attention to the proper root cutting, that is, the edge is really cut off, and the other side can not be too damaged, in order to facilitate the rapid slow seedling; Second, pay attention to the large incision, otherwise, easily dispersed, often Drought, resulting in slow secondary roots, can not reach the goal. The incision should be pressed properly; three should pay attention to the incision not too deep, do not dig beans. Correct application of this method can increase soybean production by about 12.7%. 2. Twice to top. Hongfengsiru soybean is a sub-stemmed pod variety with limited stem type. The branching force is slightly insufficient, and the number of natural branches is not more than 3. To promote multi-branching, branching into branches and increasing the yield per plant, topping should be performed. That is, when the seedlings cut off the roots for 3 days - 5 days, they will grow into two opposite leaves, and will go from the base of the compound leaves to the top and promote their "four-door fighting" type four branches, this is a topping; The top is when the soybean grows up to 1 meter, because the nutrition grows too fast, if you do not control the height, let it grow, often grow more than 1.7 meters long, resulting in severely hindered the development of the lower leaves of the bean tree, and can not carry out effective photosynthesis. Can not form organic nutrients, often aging and yellowing: and withered, according to the theory of plant growth balance, the growth of the lower stems, roots will be limited, can not produce scars and reduce production, to this end, the top to fight, together with the Dian Ji amine Controlled once. When applying this technique, it should be noted that: once the top is to be “smallâ€, the second top should be “old†(that is, hit the top). After topping, due to the inertia of plants, the cells will continue to grow vertically for a period of time, and can still be “hard-pulled high†for about 30 centimeters, reaching a normal high-yielding plant height of 1.3 meters. Correct use of this method can increase soybean production by 14.7%-21.2%. 3. Clever application of fertilizer. Soybean needs special molybdenum, if the soil supply is insufficient, it will grow poorly, the photosynthetic efficiency will decrease, the plants will become shorter, and the yield will be greatly reduced. In fact, the soil contains very little molybdenum and can not meet the growth needs of soybeans. Molybdenum seed dressing and extra-root spray are commonly used. The artificially increased application rate of mu is 1 kg for seed dressing and 2 kg for spraying outside the roots. The best period is before and after the knot period. In order to fully absorb the soybean nutrition, lay a good foundation for high yield, seedlings to anthesis with plant power 2003 and spraying Baogen external spray 2 times - 3 times. This method can increase soybean production by more than 10%. 4. Spring cover. Sowing in spring, the temperature is too low, the air is dry, affecting growth, so after sowing film protection, can shorten the soybean seedling period, flowering period, increase production significantly, generally can make soybean flowering in advance more than 10 days. Covered with film, it should be boiled thick, medium and late-maturing high-yield soybean varieties, with about 7500 per mu is good. The average yield increase of 21.7%.
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