The three main improved varieties are six and small shallots, drum thunder shallots and Yunnan shallots. With the cultivation of fresh produce, the drum thunder varieties are mainly used from late March to July. In August and September, the Yunnan scallion is strong in the typhoon rainy season and from September to January. Seed cultivation in October to sell onion products should be used in large, dense aroma of drum thunder species sown in October
(b) Selection of base foot basal fertilizer and dressing
Select easy-to-irrigate fertile gardens and rotate with non-garlic crops. Individuals need to weigh in 4000 to 7,500 kilograms of red soil to improve the soil. Garden before sowing, ploughing and drying in the sun. The basal fertiliser is applied to fully decomposed high-quality farmyard fertilizer 4000-5000kg or decomposed chicken, duck and manure 700-10 calcium phosphate 50kg, and potash 10kg entwined: According to the planting habits, the width is 1.2m, and the elevation is 20-degrees.
(III) Onion Processing
Selected onion variety, onion flap full, no lesions, no disability, no mildew, no pests are not injured onion stripping flap, generally stripped to single heart or double heart (that is, one or two buds) Grade basis, according to the large, medium and small grading.
(d) Properly densely planted and used
According to the purpose of cultivation, the characteristics of the varieties, using flat hoe cultivation, generally 7 畦 per 畦 planting distance: ? ? July 6 8 , 8cm, 8 9 9 months in the high temperature period appropriate relaxation to 8 10 10cm, planting depth in October to plant onions The bud tip is appropriate. Every 667m2. Seed quantity: The seeding period shall be determined according to the species of onion, seed, and water. The early stage, medium and late stage of the planting period, such as the early period of Gulei (from late March to April), 667m2, 325-350kg, mid-term (May-July) 200kg or so. Yunnan Shallot 1 and Scallion 100kg. In later season, the onion has low water content, and the seed amount per 667m2 is 30 to 4
(5) Strengthen field management
1. Spray the herbicide in time after sowing time: spray 50% acetochlor with 1000 times wettable green mailong powder with 800 to 1000 times water per 667m2, spray grass in summer or August 6th in August brush.
2, spray herbicide timely irrigation: After spraying the first irrigation, to fill foot, irrigation wet, planting onions and soil contact, for about 10 days Qimiao, full seedlings. If no see Qimiao within 10 days
3, do a good job of waterlogging seedlings: Qimiao, about 12-15 days after sowing, grasping the appropriate period of anti-water seedlings, control the water to the bottom of the groove sun. To promote the development of the underground root system, short-skinned strong, strong resistance to stress. Make it grow stronger in the middle and late stages.
4, scientific fertilizer: Spring and summer shallots short growing period, top dressing usually one or two times, the first 20 to 25 days. The combination of irrigation topdressing 15:15:15 three-in-one compound fertilizer 17.5kg, the second 12-15 days followed by 15kg three-component fertilizer. Autumn and winter shallots have a long growth period. The number of top dressings is the same as that of the first and second application of spring and summer fertilizers, and the third time it is necessary to supplement nitrogen fertilizers. Per 667m2 with 75 ammonium carbonate irrigation ditch.
5, pest control: 1 gray mold, Pythium, soft rot and other diseases, with 65% 1000 times or 65% zinc and 1000 times Pu Pu water or 65% Zinc water distribution 800? 1000.
2 Liriomyza huidobrensis, onion land fly, round-purple spotted coleoptera, green onion thrips, and podworms, sweet pests, with 50% phoxim emulsion water 1000 times or 2.5% cypermethrin emulsion with water mist control.
(6) Proper harvesting
The spring is generally harvested from 55 to 60 days, generally 38 to 45 days in summer and 80 in autumn and winter. After harvesting, the dead leaves are stripped, the outer sheath is white, no sand is soil, and the place where the bundles are bundled with 1 to 5k can be put into the freezer at 17°C for 2 to 3 hours.
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