Four key points of spring onion management in autumn

Green onion, scientific name Allium fistulosum L.var. Giganteum Makion) is a kind of onions, which can be divided into four types: common onions, shallots, scallions and scallions. Spring onion taste pungent, sexual lukewarm, with the release of yang, detoxification and seasoning, sweating bacteriostasis and vasodilation effect. Mainly used for cold, cold and fever, headache and nasal congestion, cold and abdominal pain, dysentery diarrhea, internal obstruction of insect accumulation, obstruction of milk, adverse stool and other symptoms. Spring onion contains volatile oil, which is mainly composed of allicin, dienyl sulfide and calcium oxalate. In addition, it also contains fat, sugars, carotene, vitamin B, vitamin C, niacin, calcium, magnesium, iron and other ingredients.

Morphological characteristics of Welsh Onion

Roots: roots white, chord-like, lateral roots few and short. The number, length and thickness of roots increased with the increase of the total number of leaves. Green onion growth period, the number of roots can reach more than 100.

Stem: stem extremely shortened in globose or oblate globose, solitary or fascicled, thick 1~2cm, white, membranous, unruptured. There are many layers of tubular leaf sheaths in the upper part and dense fibrous roots in the lower part. When the growth point at the tip of the seedling differentiates into a flower bud, the flower stem will be gradually developed. Green onion flower stem stout, hollow unbranched, long 30~50cm.

Leaf: the leaf consists of a leaf body and a leaf sheath. The leaf body is conical, hollow, green or dark green. A single leaf sheath is cylindrical. The multi-layer sheath and its inner 4-6 unsheathed young leaves form a clavate pseudostem.

Flowers: inserted at the top of the flower stem, the developing umbel is hidden in the involucral bract before flowering. Onion plants with full growth of vegetative organs, an inflorescence with 400-500 flowers, more than 800. Bisexual flowers, cross-pollination. Each flower has 6 perianth and 6 stamens. When the pistil matures, the style grows 1cm. Ovary superior, 3 locules, 2 capsules per locule.

Fruit seed: the fruit is a capsule, which is easy to crack when ripe. Seeds peltate, black, 6-angled, irregularly densely rugose. The 1000-grain weight is 2.4-3.4 g.

Four key points of spring onion management in autumn

The rainy season ends in late August, which is an important period for the growth of autumn vegetables, and its field management should be strengthened. The center of field management of green onion is to promote root, strong plant and soften soil, strengthen fertilizer and water management, and create suitable environmental conditions for the formation of green onion, so as to improve the yield and quality of green onion.

1. Watering: green onions after planting into the high temperature season, at this time the management center is to promote roots, should control watering, drainage after rain to prevent causing rotten roots, yellow leaves and dead seedlings; at the same time, strengthen mid-tillage to promote root growth. Between the Beginning of Autumn and Bailu Festival, irrigation should grasp the principle of light watering and watering sooner or later. After White Dew, green onions entered the peak growth period, irrigation should grasp the principle of frequent watering and re-watering, watering every 4-6 days. After Frosts Descent, the temperature dropped, green onions basically grew, water demand decreased, and the soil should be kept moist. Stop watering 5-7 days before harvest, which is beneficial to harvest, storage and transportation.

2. Topdressing: green onions should also be topdressing by stages on the basis of sufficient base fertilizer. After the Beginning of Autumn, when the plant growth accelerated, "leaf-attacking fertilizer" was applied, 15002000 kg of rotten farm manure and 20kg of superphosphate per mu to promote leaf growth. Entering the peak growth period of green onion after Bailu Festival is the key period for the formation of green onion yield. We should apply "attacking plant fertilizer" twice in combination with watering, applying 15kg urea and 10kg potassium sulfate per mu, spreading between rows, and watering after shallow ploughing.

3. Soil cultivation: soil cultivation is an important measure to soften leaf sheath, prevent lodging and improve the yield and quality of onion. From the beginning of the autumn festival to before harvest, the soil is generally cultivated three times, and the first two times are combined with mid-ploughing to choke the ridge soil into the green onion ditch, and the End of Heat will fill the ditch; each time the green onion culture height should be determined according to the growth height of the pseudostem, 3-4 cm each time, the soil should be cultivated to the outlet of the uppermost leaf, and the heart leaf should not be buried to prevent the leaf from rotting.

4. Disease prevention: in order to prevent the harm of leaf miners, spray dimethoate once every 8 to 10 days (15 ml of dimethoate per 15 kg of water). When the leaves of onions have brown spot or gray spot, 1000 times carbendazim spray can be used to control.