When do green beans grow?

Mung bean is an annual herb of the genus Leguminosae, with a growth cycle of about 60 to 65 days, wide adaptability, strong stress resistance, drought tolerance, barren tolerance, shade tolerance, short growth period, and the ability of symbiotic nitrogen fixation and fertilizing soil. often used as a good crop for replanting, filling and famine relief, it has a very high planting prospect. Let's take a look at when mung beans will be planted.

Mung bean planting time

Mung bean has a short growth period and a long sowing period, so it can be sowed in both spring and summer in many places. Generally, the seeds can be sown when the ground temperature reaches 16-20 ℃. The sowing time of mung bean in most of the plots with irrigation conditions is from May 15 to 30, and most of the sandy hills without irrigation conditions are sown from June 12 to 15, and generally spring sowing is from mid-late April to early and middle May. Summer sowing is from late May to the first and middle of June. In the north, the suitable sowing time is short, the annual spring sowing period is from the beginning of May to the end of May, and the summer sowing period is from late May to early June. Spring sowing in Northeast China is in mid-May and summer sowing in mid-late June. Note that mung bean is a temperature-loving crop. If sowing in spring is too early, the individual development is poor, the growth period is prolonged, and the yield is reduced. It is better to sow mung beans early in summer, the seedlings grow healthily, and the flowering and podding stage is in the stage of high temperature and rain, which is beneficial to the formation of flowers and pods, many pods, many seeds, grain weight and high yield.

Sowing method of mung bean

1. Fine soil preparation: mung bean is a dicotyledonous plant with large cotyledons and weak top soil ability of seedlings. Therefore, it is necessary to make fine soil preparation before sowing, and achieve the goal of leveling the soil fine, empty on the top and solid on the bottom through turning, raking and pressing. Those with watering conditions should make soil moisture, and those without watering conditions should prepare the soil early and wait for rain to sow seeds. Land preparation is usually done in the first and middle of April.

2. Seed treatment: diseases, impurities and hard seeds should be picked out before sowing to ensure the purity and germination rate of seeds. Seed selection uses wind selection, water separation or machine selection to remove blighted grains, small grains, impurities and grass seeds, and leave clean large seeds for sowing. On a sunny day, put the seeds on a thin mat and turn them in the sun for 1 or 2 days to enhance the seed vigor and germination potential. Gently rub the "iron green beans" with dark color, rough skin, poor water absorption and not easy to sprout, so that the seed coat is slightly damaged, easy to sprout and emerge. Sprinkle a small amount of water on the seeds, sprinkle the bacterial agent on the wet seeds and mix well. Do not mix rhizobium fertilizer with chemical fertilizers and fungicides. Commonly used nitrogen-fixing bacteria contain 300 million rhizobium per gram of nitrogen-fixing bacteria and 125 grams per mu. Or dressing seeds with coating agents, drought-resistant agents or micro-fertilizers such as molybdenum and boron.

3. Sowing method: mung bean can be sown when the ground temperature reaches 16-20 ℃. Spring sowing is in May, and the earlier the summer sowing mung bean, the higher the yield. Strip sowing is the most, hole sowing and sowing can be done. Strip sowing should prevent the soil from being too deep, the seeds too thick and the seeds missing. Intercropping, interplanting and sporadic planting are mostly hole sowing. The sowing depth is generally 3-5 cm. The amount of seed used per mu is 1kg / mu, with less fertile land and more thin land.

Field management of mung bean

1. Suppressing and replenishing seedlings: after sowing, the plots with poor soil moisture should be suppressed in time, so that the seeds will be in close contact with the soil, increase the surface moisture, promote the germination and development of seeds, emerge early and produce the whole seedling. After the emergence of mung bean, it is found that there is a phenomenon of missing seedling and broken ridge, which should be replanted within 7 days.

2. Seedling setting: in order to make the seedling develop well, when the mung bean emerges with two leaves in one heart, the pimple seedlings should be removed. The seedling should be fixed with 4 leaves, the plant spacing should be 13-16 cm, and the row spacing should be about 40 cm. According to the fixed density, remove weak seedlings, diseased seedlings, small seedlings, weeds and weeds, leaving strong seedlings. The practice of keeping seedlings per plant is beneficial to the healthy growth of plants.

3. Weeding by mid-tillage: it can not only eliminate weeds, but also break soil consolidation, loosen soil, reduce evaporation, increase soil temperature and promote nodule activity, which is a measure to increase the yield of mung bean. Generally speaking, after the first compound leaf of mung bean is unfolded, the first shallow hoe is combined with the seedling, after the second compound leaf is unfolded, the seedling is fixed and the second intertillage is carried out, and the third deep ploughing is carried out at the branching stage, and the root is sealed to cultivate the soil, and the intertillage should be carried out until the ridge is sealed. The principle of shallow-deep-shallow should be mastered in the depth of middle tillage.

4. Irrigation and waterlogging prevention: mung bean is a crop that needs more water, is not resistant to waterlogging, and is afraid of flooding. Mung bean has strong drought resistance and less water demand at seedling stage, and the flower and pod stage is the peak period of water demand. At this time, water should be irrigated in time in case of drought. But mung beans are afraid of flooding. If there is too much water in the seedling stage, it will aggravate the root disease and cause rotten roots and dead seedlings. In the later stage, when there was waterlogging, the plant grew poorly, appeared premature senescence, peeled off flowers and pods, and the yield decreased. Therefore, mung beans should be drained and waterproof in the rainy season.