Hydroponic vegetables?
1, hydroponic vegetables grow in aquatic environment, and the water supply is absolutely sufficient compared with soil cultivation; ?
2. The nutrient solution provided by hydroponic vegetables is a nutrient element that is completely matched according to the growth needs of plants, and the nutrition is more comprehensive and balanced. ?
3. For soil cultivation, the roots of vegetables are not squeezed and bound by soil, and there is enough room for development. Therefore, the roots of hydroponic vegetables we see are generally developed, which is more conducive to the absorption of water and nutrients by plants. ?
4. Hydroponic vegetables are generally grown indoors. Compared with open-air soil cultivation, hydroponic vegetables are not or rarely affected by external temperature changes. In addition, in the case of insufficient light, the automatic glass greenhouse will supplement the light for plants by artificial means. Therefore, under the condition of suitable temperature and sufficient light, the growth of plants will naturally be better than that of soil cultivation mode. ?
soil tillage
Because the reduction conditions of local soil (such as when the root zone is flooded) are easy to produce, the possibility of nitrate reduction to nitrite in soil cultivation is much higher than that in hydroponics, and vegetables cultivated in soil may also contain higher nitrate and nitrite. Moreover, hydroponics is more controllable than soil culture, and the nitrate content of vegetables can be completely controlled by adjusting the supply and supply time of nitrate in nutrient solution, which soil culture can not do. The analysis results from the quality and safety inspection and supervision centers of agricultural products around the country also show that the nitrite content of hydroponic vegetables is mostly only a few tenths of the national limit standard, so hydroponic vegetables are safer.
Water spinach prefers heat to cold, and can grow normally at > 10℃. Under the cover of greenhouses or greenhouses in southern China, the seeds can be sown during11~ 65438+February, and about 2 weeks after sowing. However, in the middle and lower reaches of the Yangtze River and the northern region, if there are thermal insulation facilities, you can sow after the spring (about March). In recent years, with the application of solar greenhouse and other heating greenhouses in production, the sowing date has been greatly advanced, and some areas have started sowing and planting in June 5438+ 10, in order to get on the market as soon as possible and obtain higher economic benefits. Harvest can begin about 25~40 days after sowing, with sufficient sunshine. The initial harvest period is shorter when the temperature is higher and longer when the temperature is lower and the sunshine is insufficient.
Water spinach can be planted in both hydroponics and substrate culture facilities, but these soilless culture facilities must have sufficient planting density to ensure the increase of yield. In hydroponics, nutrient solution membrane technology and deep flow technology have better production effect and higher yield than substrate cultivation. Because spinach consumes a lot of water and absorbs a lot of fertilizer, water and fertilizer supply in hydroponics is faster than that in substrate cultivation. In hydroponics, deep flow technology is more effective than nutrient solution membrane technology, and the management of production process is more convenient. After planting for a long time, you can also select the lower part of the stout branches, cut off 2-3 segments, pull out plants with weak growth, insert the cut stout branches, insert 3-5 segments into each planting cup, then slightly fix the planting cups with pebbles, put them back into the planting holes of the planting tray, and at the same time raise the liquid level in the planting tank to the bottom of the planting cups about 1-2 cm. In substrate cultivation, cuttings can be rejuvenated in another rejuvenation sand bed or other substrate beds, and then transplanted into the planting tank after the cuttings grow roots and lateral branches. ?
Pest control The main diseases that harm the growth of water spinach are white silk disease and Sclerotinia sclerotiorum. The main pests are red spiders and aphids.