Daytime management technology of soybean

1. Seedling as early as possible.

The peasant proverb says, "if the seedlings are an inch earlier, there will be a crop of dung on top." Interseedling is particularly important for mechanical strip sowing or big ploughing to plant peas. If the distribution of seedlings is uniform and reasonable, the phenomenon of seedling bullying can be prevented in time, which can reduce the consumption of soil nutrients and water, make the development of seedlings balanced and healthy, so as to increase the yield of soybean. The interseedling is generally carried out in the period of two opposite single leaves spreading and compound leaves appearing in the seedling stage of soybean. Diseased seedlings, weak seedlings, seedlings and miscellaneous seedlings should be removed between seedlings.

2. Ploughing and weeding.

Generally required to achieve three shovels and three boring. Specific time: the first time is around June 1, the second time is around June 20, and the third time is at the end of June or early July, according to the growth of soybean shovel boring the third time, and then pick up the big ridge.

3. Look at the topdressing of seedlings.

For barren plots, nitrogen fertilizer should be applied according to soil fertility and seedling appearance, generally applying 75kg ammonium nitrate per hectare. Ditch application can be combined with the second shovel boring, or potassium dihydrogen phosphate can be sprayed outside the root, with 0.5 kg of potassium dihydrogen phosphate per hectare to 400 kg of water. It can also be combined with aphid prevention.

4. Control aphids and heart-eating insects.

Soybean aphids are the main pests harmful to soybean production. If they occur seriously, they will cause curling of soybean leaves and spread of the virus, resulting in a substantial reduction in production. When the harm of aphids reaches the control target from early June to early July, that is, the rate of aphids in the field is 30%-40%, and the number of aphids per hundred plants is more than 1500. Spray control with 2000 times of imidacloprid forest should be used immediately. It can also be sprayed with 2000-3000 times of oxymethrin EC, 600-700 kg per hectare.

Soybean heart borer enters the peak period of adult spawning and hatches into larvae to eat soybean grains in the first ten days of August every year, which seriously affects the quality of soybean and reduces the commodity value of soybean. At present, the more common method for the control of soybean heart borer is to soak 50 kg peeled corn stalks with 0.5 kg of 80% dichlorvos EC and evenly sprinkle them in 1 hectare soybean fields in the evening for fumigation control.

5. Clear the grass in the field.

Weeds are often left in the process of weeding in the middle tillage, and although the branches and leaves are luxuriant in the late growth stage of soybean, they can not be suppressed. These weeds grow fast and have tall plants, which compete with soybean for glory, water and fertilizer, which seriously affect the normal development of soybean, so these weeds must be pulled out at the end of July or early August after soybean shoveling and boring, so as to facilitate soybean ventilation and light transmission, promote ripening and increase yield. This can also reduce the grass damage of the following crops.