How to cultivate coriander out of season

Coriander is also known as coriander, salt coriander, star and so on. It is an annual herb of the genus cilantro of Umbelliferae. Originally known as coriander, the English name Coriander Herb, originated in Central Asia and Southern Europe, or near the East and the Mediterranean. Cultivation techniques and pickling methods have been recorded in Qi Min Yao Shu. Its tender stems and fresh leaves have a special fragrance and are often used as embellishments and flavors of dishes.

Morphological characteristics of coriander

Annual or biennial, strongly scented herbs, 20-100 cm tall. The root is fusiform, slender, with many slender branches. Stems Terete, erect, much branched, striate, usually smooth. Root leaves stipitate, stalk 2-8 cm long; leaf blade 1-or 2-pinnatisect, pinnae broadly ovate or flabellate, 1-2 cm long and 1-1.5 cm wide, margin obtusely serrate, notched or parted, upper cauline leaves 3-or even more pinnately divided, ultimate segments narrowly linear, 5-10 mm long, 0.5-1 mm wide, tip obtuse, entire. Umbels terminal or opposite to leaves, peduncle 2-8 cm long; rays 3-7, 1-2.5 cm long; involucral bracts 2-5, linear, entire

Umbels with pregnant flowers 3-9, white or lavender; calyx teeth usually unequal in size, small ovate-triangular, large long-ovate; petals Obovate, 1-1.2 mm long, ca. 1 mm wide, tip with concave tongues, radiation petals 2-3.5 mm long, 1-2 mm wide, usually entire, with 3-5 veins; filaments 1-2 mm long, anthers ovate, ca. 0.7 mm long Style erect when young, reflexed outward when fruit is ripe. The fruit is round, and the main ribs and adjacent secondary ribs are obvious on the back. The ventral surface of the endosperm is concave. The tubing is not obvious, or 1 is located below the secondary edge. Flowering and fruiting period from April to November.

How to cultivate coriander out of season?

I. Variety selection

When coriander is cultivated out of season in summer and autumn, it is appropriate to choose cilantro varieties with strong resistance to dampness and heat, disease, stress and big leaves.

2. Seed treatment

It is difficult for coriander seeds to germinate at high temperature. Soak the seeds with carbendazim 300x solution for half an hour before sowing, soak the seeds in clean cold water for about 20 hours, and then germinate under the condition of 20-25 ℃ before sowing.

III. Soil preparation and fertilization

Choose the land with convenient drainage and irrigation, loose and fertile soil, turn 20-25 cm in time after the harvest of the previous crop, and stay in the sun for 15 days. In order to facilitate the use of the sunshade net, a deep trench high border with a width of 120 cm, a height of 20 cm and a width of 30 cm is made. Coriander growth period is relatively short, combined with soil preparation, per mu of rotten mature human feces and urine 3500 kg, cake fertilizer 150kg, calcium magnesium phosphate fertilizer 50kg as base fertilizer, to fine and level the surface soil of the border, in order to facilitate the emergence of seedlings.

Fourth, sow seeds at the right time

Coriander is cultivated out of season in summer and autumn, generally sowing from mid-May to early July, with a seed consumption of 1 kg per mu, which can obtain higher yield and higher price. In the case of suitable soil moisture, spread evenly and cover 1-2 cm. Cover the grass to protect the tide, protect the moisture and promote the seedlings, take it off after 5-7 days, and pay attention to maintain the soil moisture.

V. Field management

The summer and autumn atmosphere is getting higher and higher, which will affect the growth of coriander, so take off the grass and build a frame to cover the sunshade net in time. The sunshade net should be covered during the day and exposed at night to strengthen ventilation to prevent seedlings from growing thin and causing diseases. Because of the short growing period, coriander is suitable for early weeding, early seedling and early topdressing of available nitrogen fertilizer. Generally speaking, the seedlings should be carried out about 7 days after the full seedlings, and the seedlings should be fixed when there are 2 true leaves, and the seedling distance is 2-3 cm. Usually irrigate once every 8 days or so, start topdressing when the seedling is 3 cm high, topdressing 10-15 kg of urea and 250 g of boron fertilizer per mu. After that, combined with watering, carbon ammonia or urea was applied for 2-4 times, and in the later stage, appropriate amount of potassium dihydrogen phosphate should be added to promote leaf growth.

VI. Disease and pest control

The prevention and control of diseases and insect pests of public pollution parsley should be based on the principle of giving priority to prevention and supplemented by treatment, and a variety of control methods should be combined to control diseases and insect pests in the minimum range.

The main results are as follows: 1. Agricultural control is based on varieties with strong disease resistance, implement rotation and avoid continuous cropping. Timely removal of diseased plants and diseased leaves in the field to reduce the chance of bacterial infection. Strengthen fertilizer and water management and improve plant disease resistance.

2. Physical and biological control techniques such as frequency vibrating insecticidal lamp, sex attractant, Bt powder and so on.

3. Chemical control diseases mainly include seedling quenching disease, adult stage virus disease, anthracnose and spot blight. Five days after emergence, spray once with the 800-fold solution of pollution-free fungicide 3% polyoxane, and then spray 600 times every 7 days for a total of 2-3 times, which can prevent quenching, anthracnose and spot blight. To prevent and control virus diseases, anti-insect nets can be used to prevent the spread of aphids from flying in; shading can be used to avoid high temperature and drought environment to reduce the occurrence of aphids; and 20% imidacloprid wettable powder 20 grams plus 50 kg of water can be sprayed on leaves to thoroughly control aphids and prevent the occurrence of virus diseases. Liriomyza huidobrensis was sprayed with 1500 times of avermectin.

VII. Harvest

About 40 days after sowing, it can be harvested. Spraying 20-25ppm gibberellin about 15 days before harvest could elongate leaves, increase branches and increase yield.