Growing period of multiple planting of wheat and soybeans

The general growth period for different varieties of soybeans is about one hundred days.

The soybean growth period is generally about 120 days.

The growth cycle of soybeans is about 5 months.

The growth period of different varieties varies from place to place. Locally, it is about 90 days.

The growth periods of soybeans are different, including early maturity, medium maturity, late maturity, etc., generally ranging from 80 to 120 days.

The variety selected and bred in Jilin area is 126 days.

Soybeans have different growing periods depending on the regional varieties.

Generally, the growth cycle of soybeans is about 180 years.

The soybean growth period is generally nearly four months.

It takes about 120 days to soybeans in spring, and 50 to 60 days if soybeans are planted under wheat.

Planting soybeans under wheat stubble is the main cultivation form of multiple planting under wheat stubble in our city. It not only achieves high yield and increases income, but also helps to fertilize the soil. Soybeans are the most ideal land-supporting crop in crop rotation. (1) Selection of improved varieties Currently, the early-maturing and high-yielding soybean varieties promoted in our city include Liaodou No. 1, Hefeng No. 26, etc. These varieties have strong plant growth, with plant heights of 47-57 cm, bottom pod heights of 9.1-12.3 cm, 100-grain weights of 15.4-18.0 g, growth periods of 72-78 days, and generally yields of about 200-300 kg per mu. (2) When selecting and preparing the land, choose a neutral or slightly alkaline wheat field with deep soil, rich in calcium, humus, water and fertilizer, and good drainage for double planting with soybeans. In order to sow seeds early, the land must be prepared in time after the wheat harvest. You can also prepare the land while harvesting, pick up the root stubble, and pick it up again. (3) Preparation before sowing 1. Select good seeds. Before sowing, the seeds should be carefully selected to remove broken grains, dead grains and diseased grains, and conduct germination tests. The purity and germination rate of seeds used for sowing reach more than 90%. 2. Ammonium molybdate seed dressing: Ammonium molybdate seed dressing is beneficial to promote the growth and development of soybeans and increase yield. The method is to prepare 1-1.5% ammonium molybdate aqueous solution, mix 20 kilograms of seeds with 1 kilogram of solution, dry in the shade and sow. 3. Chemical seed dressing In order to prevent and control underground pests, use 0.7 panacea powder to evenly dress the seeds, or mix 2-2.5 kg of 5 phorate with 15 kg of poisonous soil, and spread it in the ditch with sowing. (4) Sowing and Density Wheat stubble soybeans should be sown before July 10-15. The method is to use plows and picks to dig trenches, with a row spacing of 33-40 cm, a plant-to-plant spacing of 5-7 cm, a seeding rate of 9-11 kg per mu, 35,000-45,000 seedlings per mu, and a seeding depth of 5-7 cm. After sowing, when the ground is slightly dry, it should be suppressed in time to allow the seeds to absorb moisture to facilitate germination. If the moisture is not good, you need to step on the bottom grid or increase the moisture during sowing to preserve the seedlings. (5) Field management 1. Time the seedlings at the right time and shovel them in time. After the soybeans grow true leaves, they should be thinned out in time. If the seedlings are thinned out too late, the seedlings will crowd each other and affect their growth. Mechanical precision hole sowing is used, and seedlings need not be thinned. 2. Before and after cultivating and cultivating the soil to eliminate weeds and thinning out weeds, the first shoveling and raking of the ground should be done to eliminate weeds. This plays an important role in promoting the development of the soybean root system and forming strong seedlings; the second shovel pass should be carried out 4-5 pairs of true leaves before soybean flowering; before the ridge sealing, the third shovel pass should be combined with soil cultivation. 3. Reasonable fertilization and irrigation (1) Top-dressing nitrogen fertilizer During the growth period of soybeans, 30-50% of the nitrogen comes from nitrogen fixed by rhizobia, and the remaining 50-70% of the nitrogen still needs to be supplied by the soil. Especially in the seedling stage, before root nodules form in large numbers, the nitrogen required is almost entirely supplied by the soil. Soybeans require the most nitrogen during the flowering and seeding stages. Therefore, in the early stages of soybean flowering, 10-15 kilograms of urea should be applied per acre. (2) Irrigation Seedlings generally do not need to be irrigated during their growth period. The flowering period is the peak period of water demand. In the early stages of flowering, watering should be combined with top dressing. During the pod and grain stage, irrigation should be carried out according to soil moisture and rainfall conditions to prevent drought. 4. Application of "Zengyiling" can reduce the shedding of flower pods. "Zengyiling" is a plant growth hormone, which can reduce the shedding of flower pods. Dissolve Zengchanling in alcohol and prepare an aqueous solution of 2/100,000 to 4/100,000. Spray it once during the early and full flowering stages of soybeans, with an interval of about 7-10 days. Generally, it can increase yield by about 10%. 5. Pest Control The main pests of soybeans are aphids, spider mites, leaf rollers, bridge-building insects and heart-eating insects.

Control methods: In the early stages of soybean aphids, use 1% dimethoate powder 2-3 kg/mu or spray 40% dimethoate emulsion 1000 times. Soybean leaf rollers can be sprayed with 2-3 kg/acre of 2.5 trichlorfon powder or 80% dichlorvos emulsion 3000 times in the early stages of occurrence. Soybean heart-eating insects can be sprayed with 100 grams of dichlorvos crude oil 2-3 days before the peak of adult emergence. /mu, dip 30 stalks of rice straw and insert them evenly into the bean field for control. 6. Harvesting: When the leaves of the soybean plants have basically fallen off, the seeds in the pods are hard, and the sound of the seeds can be heard when shaking, it is the right time for harvesting. Harvesting must be done quickly. Harvesting too late will not only easily cause the pods to crack and fall, but also the color of the seeds will become lighter, which will affect the harvest. quality. But for those that are about to mature and have fallen leaves due to frost, do not cut them immediately. You need to wait for another 5-6 days to harvest. ?