Can corn be planted in greenhouse?

Cultivation techniques of maize

First, land selection and land preparation

1. Land selection: Choose loam or sandy loam plots with convenient irrigation and drainage, convenient management, PH6.5-7 and fertile soil to plant corn. Too sour, too sticky and too barren soil will make corn grow poorly. Fertile soil can provide sufficient nutrients for corn growth and create a good growth environment for corn growth.

2. Land preparation: After land selection, deep ploughing and harrowing should be carried out, and the ploughing depth should generally reach more than 25cm, so as to meet the quality requirements of land preparation of "leveling, fine soil, sufficient moisture and high fertilizer". Straw returning to the field and green manure land should be stubbled and buried. Combined with soil preparation, decomposed farmyard manure 1000 kg, 50 kg of bean cake and 50 kg of calcium superphosphate were applied as base fertilizer strips per mu of ditch. In order to facilitate irrigation and drainage, border irrigation should be ditched, and the drainage ditch should be repaired in combination with soil preparation. It is required that the border should be flat and straight, the ditches should be connected, and the irrigation and drainage should be smooth.

Second, select seeds to accelerate germination.

1. Seed selection: Selecting seeds with good quality, strong disease resistance and high yield, which are suitable for local cultivation, is the basis for high and stable yield.

2. Germination: Before sowing, the seeds should be dried and exposed to the sun for 3 to 4 hours. Then soak in warm water to accelerate germination, the water temperature is controlled at 50-55℃, and soak for about 15 minutes. After soaking, cool for 6-8 hours, rinse with clean water 1 2 times to sow.

Third, sowing technology.

1, sowing date: the sowing date of corn needs to be determined according to the use of corn and land use. Generally, sowing can be carried out when the temperature is stable above 65438 02℃. Sowing in Pingba shallow hilly area is generally in the middle and early March; It is generally appropriate to sow and raise seedlings in late March and early April in deep mountains and middle and low mountainous areas to shorten the growth period of Maiyu and cultivate strong seedlings.

2. Seedling raising: use fat ball or special seedling raising tray for corn to raise seedlings. Keep the structure of nutrient soil loose, with a certain proportion of fully decomposed organic fertilizer and a small amount of calcium superphosphate, avoid adding urea or ammonium bicarbonate to prevent seed rot. Put 1 seed in each fertilizer ball or grid, and increase the number of seedlings by 20% as needed to make up for the deficiency. After sowing, cover with fine soil 1 to 2 cm, and spray with clear water to keep warm.

3. Transplanting: Before transplanting, it should be selected in sunny weather. After airing the seedlings barefoot with plastic film 1 ~ 2 days, gradually uncover the seedlings 1 ~ 2 days. When the seedling has 2 leaves and 1 heart, the transplanting begins. It is forbidden to plant old and big seedlings. After planting, irrigate "root-fixing water" with one spoonful and two nests of clear manure water, and the suitable density is 3500 ~ 4000 plants/mu. In the later stage, seedlings can be thinned and replenished in time according to the emergence situation.

Fourth, the law of fertilizer demand

1. Corn is a high-yield crop, which uses more fertilizer and needs nitrogen, phosphorus and potassium most. During the whole growth period, nitrogen is the most absorbed, followed by potassium, less phosphorus, followed by calcium, magnesium, sulfur, boron, zinc and manganese. Therefore, the fertilization of corn is mainly to increase nitrogen fertilizer, combined with phosphorus and potassium fertilizer. Apply more fertilizers containing phosphorus and potassium at heading stage to promote better scions.

2, corn fertilization should follow the basic principle of "base fertilizer as the main fertilizer, supplemented by topdressing". The base fertilizer is preferably organic fertilizer, such as high-quality decomposed farmyard manure or turning green manure. The amount and method of fertilization should be comprehensively applied according to the yield index, soil fertility foundation, fertilizer type, planting method, variety and density.

Verb (abbreviation of verb) Tian Tuan management

1. Fixed seedlings and interplanting: follow the principle of "removing the weak and retaining the strong, keeping secrets and sparse, orienting, ensuring uniformity and ensuring strength". Corn seedlings are sown in the three-leaf stage, and seedlings can be fixed according to plant spacing when the leaves are five. It is necessary to pull out sick seedlings, weak seedlings and exotic plants and leave strong seedlings; In case of lack of seedlings and broken ridges, two seedlings will be left in the adjacent area to be replenished, and sufficient water will be poured to ensure the survival of seedlings. If there are too many seedlings, it can be solved by replanting.

2, intertillage weeding: corn seedling stage can be 1 ratio 2 intertillage, combined with fertilization and appropriate soil cultivation. The depth of intertillage should be shallow beside the seedlings, deep between rows, shallow before the seedlings are fixed and deep after the seedlings are fixed, and attention should be paid to pest control.

3. Water and fertilizer management: If there is water shortage at seedling stage, irrigation should be carried out in time, and furrow irrigation is appropriate. Corn is afraid of waterlogging. When the growing season is rainy, wet and waterlogged, deep ditches should be opened in time to drain the waterlogged water and improve the ventilation conditions of the soil. Fertilizer operations are light seedling fertilizer, heavy spike fertilizer and flower-filling grain fertilizer. Fertilization method is ditch application or hole application, and after application, soil is covered and watered to improve fertilizer utilization rate.