After the Spring Festival, strawberry plants in greenhouses have entered the mid to late production phase following the initial harvest. Effective management during this stage is crucial for maintaining high yields 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 strawberry cultivation along with practical solutions.
One of the main problems is uneven watering. Some farmers use drip irrigation to save water and reduce greenhouse humidity. While this method helps maintain stable temperatures and reduces disease risk, it can lead to clogged emitters over time due to poor water quality. This results in inconsistent water distribution, which can negatively impact flower development and fruit set.
To address this, it's recommended to switch from drip irrigation to sub-membrane flood irrigation in the later stages. The process involves removing the plastic film between rows, placing a sprinkler directly under the membrane furrow, and thoroughly watering the area. This method allows water to rise from the bottom up, reducing soil compaction and decreasing the number of irrigation sessions. It also saves labor and is more efficient. For clay soils, fertilization should be done every 15–20 days, while sandy soils may require applications every 10–15 days.
Another issue arises when strawberries begin their second fruiting cycle. If nutrient supply isn't increased at this stage, it can affect both yield and fruit quality. Foliar fertilizers are not ideal during flowering, making it harder to provide necessary nutrients.
To solve this, farmers should use specialized fertilizers like strawberry trace elements, Penshibao, and potassium dihydrogen phosphate. These products help replenish missing micronutrients such as manganese, molybdenum, zinc, and calcium, while also boosting phosphorus and potassium levels. The fertilizer should be diluted and applied evenly through irrigation. A typical application rate is about 25 kg per acre.
Lastly, pest infestations tend to increase as temperatures rise, with pests like aphids becoming more prevalent. These pests can significantly damage strawberry quality.
Prevention is key. Hanging sticky traps every 2 meters in the greenhouse can help reduce pest populations. After harvesting, affected areas can be fumigated with aerosol to eliminate remaining pests. It's important to move pollination bees out of the greenhouse first to avoid harm. All ventilation openings should be sealed before applying gas fog fumigants, and proper ventilation should be done the next morning. This ensures a safer and more effective pest control strategy.
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