After the Spring Festival, strawberry plants in greenhouses have entered the mid to late stages of production, with many pods already harvested. Effective management during this period is crucial for maintaining yield and fruit quality. In addition to pest control and temperature and humidity regulation, proper post-fertilization and irrigation practices are essential. Below are common issues encountered in production and practical solutions.
1. Uneven watering is a frequent problem. Some farmers use drip irrigation to conserve water and reduce greenhouse humidity. While this method helps maintain stable temperatures and minimizes disease risks, it can lead to clogged emitters over time due to poor water quality. This results in uneven water distribution, which negatively affects flower development and fruit set.
Management Tip: Based on past experience, switching to sub-membrane flood irrigation later in the season can be more effective. The process involves lifting the plastic film between rows, placing the sprinkler directly under the furrow, and thoroughly watering the soil. This method allows water to rise from the bottom, reducing soil compaction and minimizing the number of irrigation sessions. It also saves labor. For clay soils, fertilization should be done every 15–20 days, while sandy soils may require fertilization every 10–15 days.
2. As the second harvest begins, some strawberries show delayed fruiting. Without proper nutrient support at this stage, the quality and yield of the second crop can suffer. Foliar fertilizers are not ideal during flowering, making it harder to provide necessary nutrients.
Management Tip: Increase the use of specialized fertilizers like Strawberry Tracer, Penshibao, and potassium dihydrogen phosphate. These products help replenish organic matter and essential trace elements such as manganese, molybdenum, zinc, and calcium. They also boost phosphorus and potassium levels. Apply these diluted fertilizers during irrigation, using about 25 kg per acre for optimal results.
3. Pest infestations become more severe as temperatures rise. Insects like aphids and thrips can significantly impact fruit quality.
Management Tip: Implement early prevention by hanging yellow sticky traps every 2 meters in the greenhouse to reduce pest populations. After harvesting, fumigate affected areas using aerosol sprays to eliminate remaining pests. Before fumigation, ensure pollination bees are moved out of the greenhouse to avoid harm. Seal all ventilation points and apply gas fog fumigants in the evening, followed by morning ventilation the next day for safety.
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