The latest course of planting techniques and methods of plastic Film Onion

Mulched onion is a popular onion planting mode in recent years. Film mulching onion can improve the cold resistance of onion and promote safe winter. Avoid onion freezing seriously, in spring can also effectively promote onion into the green period. But also can improve soil water and fertilizer conservation and onion yield. So how do you grow onions? Today, Xiaobian brought you plastic film onion planting technology. Let's have a look together!

1. Sowing time

The sowing time of plastic film onion is very critical. Do not sow too early or too late. If sown too early, onion seedlings will grow to a robust state before winter. Therefore, the phenomenon of vernalization will occur, resulting in early bolting in the spring of the following year. If the seeds are sown too late, the seedlings are too weak before winter and vulnerable to freezing damage. Winter into the green period of time will also be relatively eat, stem and leaf growth is also very small, resulting in bulb expansion blocked. Therefore, mulching onions should be sown in mid-September, which is the best time to sow.

2. Soil preparation and fertilization

Before covering the onion after sowing, pay attention to the soil preparation work. First of all, the weeds and straws on the soil should be cleaned up, and then the soil should be deeply ploughed and tilled, and the ridge surface should be crushed and flattened to ensure that the maximum diameter of the soil block does not exceed two centimeters. Then do ridge ditch, ditch to ensure unimpeded, good drainage and irrigation. In the soil preparation, but also apply sufficient base fertilizer, base fertilizer to diammonium phosphate, organic fertilizer, urea and other fertilizer-based. Mix the fertilizer evenly and apply it to about 12 cm of topsoil. Then one week before plastic film planting, irrigation to preserve moisture, to avoid onion water loss caused by large-area planting, reduce survival rate.

3. Sowing method

After the soil preparation is done, the seeds can be sown in due course. The sowing method is mainly broadcast, mixed with fine sand and spread back and forth about three times to ensure uniform sowing, and the seeding amount per mu is maintained at about 5 jin. Covering a layer of nutrient soil after sowing, and then covering a layer of grain straw on the soil to shade, can also improve moisture retention and emergence rate. Then appropriate irrigation into small water, about a week later can emerge. Most seedlings should be exposed to mulch after emergence, and then sprayed with appropriate chemicals for weeding and sterilization. The seedlings can be planted when they are two months old, have three leaves and one heart and are 22 cm high. After planting, we should cover plastic film and strengthen management to do a good job in wintering.

4. Water and fertilizer management

After planting, irrigation water should be poured in time, and then water should be controlled to promote the extraction of new roots. And also pour good antifreeze water to ensure that seedlings can safely winter. In addition, should also be in the green period, bulb expansion period and other periods to do a good job watering. In addition, we should also do a good job of fertilizing in combination with watering in the period of returning green and bulb expansion. In the green period when the appropriate amount of urea should be applied, should be spread before rain. Then appropriate amount of diammonium phosphate and urea were applied in bulb expansion stage, mainly in spot application. Finally, attention should be paid to the application of foliar fertilizer to meet the nutrients needed for onion growth and avoid premature aging of plants.

The above is a simple introduction to the plastic film onion planting technology. Today's introduction is here, this article is for reference only, I hope to be able to help you oh!