Coriander, also known as a cold-tolerant vegetable, is a 1 or 2-year-old herb. It likes cold, cool and wet but does not like high temperature, and does not grow well under high temperature and drought conditions above 30℃.
Therefore, in general, it is mainly cultivated in spring and autumn, and it can also be cultivated by using protective facilities in winter, and it is rarely cultivated in summer.
However, due to the large market demand in summer, coriander may be used to taste various soup dishes, and the price is often higher.
So many people here plant coriander in summer and use idle greenhouse facilities for protection and cultivation, that is, shading and cooling. Specifically, talk about some skills of planting coriander in summer.
The first step is to choose varieties.
There are many varieties of coriander, but some varieties are not suitable for planting in summer. You should choose those varieties with strong heat resistance, disease resistance and stress resistance, and they must be old seeds in the second year, when the germination rate of seeds is very low.
Such as Laoshan Coriander, Four Seasons Coriander, Yang Yuan Ye Chou Xiang Cai, Laiyang Coriander, these varieties of coriander have stronger heat resistance and disease resistance.
The skin of coriander seeds is hard. Before sowing, treat the seeds, gently rub the seeds with the soles, and then soak them in warm water at about 50℃ for half an hour.
Then continue to soak in cold water for a day and a night, take it out, wrap it in wet gauze, and put it in the shade to accelerate germination. Generally, seeds can be sown after 5-6 days.
The second step is to prepare the soil for the border.
In summer, we sow coriander from June to July, and here we pick spring cucumbers, tomatoes, kale or cauliflower in the greenhouse.
After harvesting the previous crop of vegetables, clear the site in time, but clear the stubble and prepare the soil, and apply sufficient organic fertilizer, urea and phosphate fertilizer. After intensive cultivation, it is generally made into a high border with a width of about 1.5 meters, which can prevent water accumulation in the field during flood season.
The third step, sowing.
After finishing the border, water the soles of your feet with water, and sow coriander seeds after the water seeps down. You can also drill a well, that is, first open a shallow ditch and pour enough water, and then sow.
No matter sowing or furrow sowing, the thickness of soil cover should be moderate, generally around 1 cm, not too thick to prevent excavation difficulties.
Summer is also the season with high incidence of weeds. In order to prevent weeds from growing, pendimethalin herbicide can be sprayed after sowing.
For example, 50 grams of 33% pendimethalin EC, 1 barrel of water (about 30 kg) are sprayed evenly on the border to weed. After sowing, pay attention to keep the surface of the border moist and spray water once in the morning and evening to facilitate the emergence of new buds.
Step four, set up a sunshade net.
There is a lot of rain in summer, which is easy to hit the border. We always leave the film on the top of the shed uncovered, and then cover it with a sunshade net to cool down. Continuous cloudy days can't be covered.
Removing the skirt film around the greenhouse can prevent insects and sunscreens and prevent whiteflies and leaf miners. At the same time, silver-gray films can be hung in the greenhouse to drive away aphids, and yellow sticky boards can be hung to trap and kill aphids, whiteflies, liriomyza sativae and other adults.
The fifth step is on-site management.
1, thinning seedlings and fixing seedlings
When there are 1 real leaves, the seedlings of coriander can be thinned, which can be about 1 finger width. When planting 5 leaves, the spacing is 2-3 fingers wide. Pay attention to leave seedlings of the same size.
2. Fertilizer and water management
After the emergence of coriander, water it once every 10 and a half months, combined with water topdressing. In China, ternary compound fertilizer is mostly applied with water, generally once per mu 10- 15 kg. However, topdressing is generally not applied before harvest 10- 15 days.
3, pest control
There are many pests and diseases of cultivated coriander in summer. The main pests and diseases are soft rot, leaf spot, mosaic and aphid.
For the prevention and control of these diseases and insect pests, we must pay attention to the selection of drugs, mainly biological pesticides and low-toxicity and low-residue pesticides, such as Nong Kang 120, carbendazim, copper acetate, Chrysanthemum morifolium, fatty acids, rotenone and so on. Do not use 10 days before harvest.
Step six, harvest in time.
The harvest period of coriander is not too strict, and it can be harvested 50 days after sowing, which can be harvested in batches or uprooted at one time, depending on itself or market demand.
However, it should be noted that after harvesting coriander in summer, do not wash it with water, otherwise it will rot easily.