(1) Characteristics and requirements for environmental conditions: Cabbage cabbage is a cold vegetable for two years. Seeds can germinate in the range of 4 - 35 ° C, and the optimum temperature for germination is 18-22 ° C. From seeding to emergence for 2-3 days, seed germination requires light, so sowing should not be too deep. The seeds of Chinese cabbage have a short-term dormancy after seed collection, and generally disappear within 2 to 3 months. It is effective for promoting seed germination by low temperature treatment and gibberellin. The suitable temperature for growth at the seedling stage is 22 °C, and the growth temperature is below 5 °C. It can promote the flower bud differentiation of Chinese cabbage when the temperature is 3-13 °C. And the lower the temperature, the earlier the differentiation. Cabbage is beneficial when the soil moisture is 80% to 90% and the relative humidity of the air is 65% to 80%. A suitable soil pH is 5.5-7.0.
(2) Technical points of seedling cultivation: Cabbage cabbage is mainly cultivated in autumn. According to different maturity, the sowing time is in summer or early autumn. The main cultivation seasons and sowing dates in each place are shown in Table 34. The seedlings of Chinese cabbage are shaded and cooled. At the same time, we must strengthen the root protection measures. The seeding rate is 50-100 grams per mu, the seedling period is 15-25 days, and the seedlings can be planted when there are 3-8 true leaves. In the Yangtze River Basin and South China, spring cultivation can also be carried out. The sowing time is about from February to early March. The spring seedlings should be strictly controlled to prevent the seedlings from twitching by vernalization, generally not lower than 10 °C. To prevent the occurrence of diseases, we must pay attention to: 1 timely control of aphids, conditional should be used to isolate seedlings with mesh, to avoid the spread of viral diseases by aphids. 8 The roots of Chinese cabbage are weak, which is not conducive to future growth after injury. It is also easy to infect soft rot, so the root system should be protected from damage. 2 To control pests, the main pests include rapeseed larvae, small tigers, crickets, and aphids, as well as rapeseed and diamondback moths.
Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera Surveillance camera is a semiconductor imaging device, which has the advantages of high sensitivity, strong light resistance, small distortion, small size, long life, and anti-vibration. Surveillance cameras in security systems.
Image generation is currently mainly from CCD cameras, and the stored charge can also be taken out to change the voltage. It has the characteristics of anti-vibration and impact and is widely used.
Security Camera,CCTV Camera,Solar Security Camera ,4G Security Camera
Shenzhen Fuvision Electronics Co., Ltd. , https://www.outdoorsolarcameras.com