Dryland watercress watercress likes coolness and humidity, and is afraid of heat. It likes plenty of light, 7 to 8 hours of light per day. Hydroponic watercress prefers a moist, cool place.
Propagation
More in early September to the end of September, the temperature dropped to 20-25 ℃ when sowing seedlings. The specific method can be divided into dryland nursery and semi-aquatic field nursery. Dryland nursery, choose fertile soil and have proper shade for seedling plots, plowing and harrowing, land formation, made of 1.2 meters wide beds, beds of soil to reach the fine flat appropriate, first watering, to be the water seeped into the soil after sowing.
Because the seed is small, must be mixed with 1-2 times the fine soil sowing. After sowing a thin layer of sifted fine soil. Generally 100g of seed, using 60m2 seedbed, can be 1000-1333m2 field seedlings.
Daily irrigation, preferably flood irrigation, the water does not border, to keep the soil wet is appropriate, to avoid slaking. About 30 days after the emergence of seedlings, seedlings up to 12-15 centimeters high, can be transplanted to the field.
Half-water nursery seedlings should be selected from the lower terrain, fertile soil paddy, with water tillage, made into 1.2 m wide beds and 35 cm wide bed ditch, beds must be pursed flat, irrigation to make the beds sufficiently wet, but no water layer, the bed ditch is always wet with water.
After sowing, spread a layer of fine soil. When the seedlings are 4-5 centimeters high, irrigation to maintain a thin layer of water on the bed as a degree, and later with the growth of seedlings, gradually deepen the water layer to 1.5-2 centimeters.
More in mid-September, when the temperature drops to about 25 ℃, from the seedling field cut about 15 cm long in the upper and middle young stems, transplanted in the pre-plowed, harrowed, flattened field for propagation, planting requirements of the lower end of the stems and vines of the lower 1-2 sections of the tilt into the mud, row spacing of 8 cm, plant spacing of 5 cm, to be the seedling growth of up to 15-20 cm, starting planting in a large field.
The Yangtze River Basin is mostly planted in mid-October. Before planting selected robust seedlings, the requirements of thicker stems, short internodes, green leaves intact. As the plant stem is semi-prostrate growth, there is often the difference between the yin and yang side, planting seedlings, the yang side up, the base of the two sections together with the root system planted diagonally, in order to facilitate the survival of the plant. Row spacing 15 cm, hole spacing 10 cm, 2-3 plants per hole.
The preparation of the ground to apply basal fertilizer: you can choose the lower terrain, drainage and irrigation is convenient, the soil is fertile and loose paddy planting. Before planting shallow water plowing and harrowing, combined with tilling every 667m2 of rotted human urine 3000kg or 5000kg of stable fertilizer as a base fertilizer. After plowing and harrowing, keep the field thin mud or a thin layer of shallow water, can be planted. If it is a semi-dry land planting, the ground will be applied to the base fertilizer after leveling the box, watering, keep the soil moist can be.
Moisture management: semi-dryland planting, planting, watering. Initially, the field is prone to weeds, weeding in time, and then every 3-4 days watering 1 time. If the paddy field planting, the first stage to maintain a 1-2 cm water layer, and later with the growth of plants, the water level gradually deepened to 3-4 cm, but should not be more than 5 cm, in order to prevent the cause of rusty roots.
Reasonable fertilization: bean curd can be harvested 30-40 days after planting. Harvest once, should be timely application of a quick-acting fertilizer, generally per 667m2 sprinkled urea 15kg or 0.5% urea liquid foliar spray, can also be per 667m2 with rotted manure 1200kg, 5 times diluted water pouring, fertilizer time is preferred to choose in the morning and evening.
After planting when the plant height of about 25 cm can be harvested. There are two methods of harvesting; one is to pick the shoots plant by plant, after harvesting the bundle by hand, this method is more labor intensive. The other is the mud harvest, each cut three-quarters of the whole field, the old roots stepped into the mud, after fertilizer raking, leaving a quarter of the seedling planted again. This method is mostly used for large-scale cultivation.
Asexual reproduction type: asexual reproduction type of varieties can only choose to stay in the seed plant, to protect the summer to stay in the seed. The seed field should be selected in the ventilation and cool, drainage and irrigation is convenient, preferably around the place of shade, if necessary, should be covered with shade net. Pests are prone to occur in summer and should be controlled in a timely manner.
Seed-bearing type: flowering and fruit-bearing varieties, with seeds to save seeds. Yangtze River Basin, generally in mid-March buds, early April pods, early May pods ripe. In order to prevent the varieties from mixing with each other, before flowering, should be covered with a net screen to prevent the varieties from stringing pollen.
Harvesting seeds, preferably in the morning and evening, in order to prevent the seed pods from cracking and scattering seeds. Seeds harvested, can not be in the hot sun, in order to prevent the temperature is too high to affect the germination rate of seeds. After drying and threshing, the seeds are placed in a cool, dry and ventilated place to collect.