Root Control Measures for Greenhouse Vegetable Seedlings
Root problems in greenhouse vegetable seedlings are a common physiological issue, often caused by improper management practices. Initially, the roots may show signs of rust, and in severe cases, they can rot completely, with no new roots forming. This leads to yellowing and wilting of the seedlings, and eventually, they may die. 1. **Maintain Optimal Temperature** Proper temperature control is essential during the early stages of seedling growth. The bed soil should be prepared correctly, and after sowing, it's important to ensure that the soil remains warm enough. During rainy or cloudy days when light is limited, warming measures such as using electric heat mats or greenhouse warming agents can help maintain the ideal temperature. In early spring, using electric hotbeds for seedling cultivation can greatly improve insulation, resulting in better yield and quality. 2. **Control Humidity Effectively** When growing seedlings in greenhouses or shelters, avoid overwatering, especially when the seedlings are close together. Water only when necessary, and never in excess. If the seedbed becomes too dry, you can cover it with moist fine soil to meet the seedlings' water needs while also reducing air humidity. If the humidity is too high, covering the bed with ash or hay can help absorb moisture. Additionally, ventilating the greenhouse during midday when temperatures are higher can effectively reduce humidity. 3. **Ensure Adequate Lighting** Before planting seedlings, choose a location that receives plenty of sunlight. Good lighting promotes strong and healthy growth, enhances the seedlings’ resistance to disease, and helps prevent root-related issues in vegetables. 4. **Use Organic Fertilizers** To raise healthy vegetable seedlings, it’s important to incorporate farmyard manure, particularly well-rotted hot manure, into the soil. This improves soil fertility, strengthens the seedlings, and boosts their disease resistance. It also helps increase soil temperature, which can reduce the occurrence of diseases. The process involves mixing well-fermented hot manure into the bed soil before planting. However, make sure the manure is fully decomposed; otherwise, it may burn the roots. 5. **Ventilate Regularly** Once the cotyledons have unfolded, choose a clear and warm day to remove the cover for ventilation. Spread a thin layer of dry, fine soil over the seedbed and then re-cover it securely. This not only lowers the moisture level in the soil but also provides some warmth, helping the seedlings grow stronger and healthier.ZHONGSHAN G.H.L. TRADING CO., LTD. , https://www.ghltrade.com