How to prevent abnormal fruit in greenhouse strawberries

Greenhouse cultivation is a good way to increase strawberry yield and income. However, due to the strong technology of greenhouse cultivation, especially in winter and early spring, under the conditions of low temperature, weak light and changeable climate, if it is not managed properly, it often produces more abnormal fruits that are too thin, too fat, bent, flat and uneven, which are called deformed fruits. According to the investigation, the phenomenon of abnormal fruit of strawberry in greenhouse is quite common, and the following measures can be taken to reduce the occurrence of abnormal fruit. The selection of improved varieties is the most effective measure to control the occurrence of malformed fruit. Cold-tolerant varieties, because of strong resistance to low temperature, the probability of abnormal fruit will be greatly reduced. Varieties with poor disease resistance are susceptible to disease at flowering stage, which will lead to the increase of malformed fruit. Adjust the temperature of the shed. Low temperature is an important cause of abnormal fruit. Strawberries like warm and cool climates. they are not resistant to cold and heat. When the temperature reached 5 ℃, it began to sprout and grew, and the optimum temperature for growth and development was 20 ℃ ~ 25 ℃, and it was disadvantageous to its growth and development when it was lower than 10 ℃ and higher than 30 ℃. Pollination is the key measure to reduce the production of malformed fruit. In the cold season, the outdoor temperature is low, the air outlet of the shed is small, the release time is short, the indoor is in a windless state, the outside of the shed is cold, no insects enter, strawberries can not be pollinated with the help of wind and insects. Poor pollination is another important cause of abnormal fruit. The countermeasure is to do well pollination. Water imbalance is an important cause of malformed fruit. Strawberries are very sensitive to water, afraid of both drought and waterlogging. If the soil is too dry or too wet in the greenhouse, it will cause the imbalance between water and nutrient supply and demand, resulting in poor fruit development and the formation of abnormal fruit. Because the root system of strawberry is shallow, the main part of the root system is in the 20 cm topsoil, which is not resistant to drought. In addition, due to the high room temperature and large soil water evaporation, drought is very easy to occur. When the soil moisture is insufficient, it should be watered in time. However, due to the lack of ventilation in the shed in the cold season, the indoor moisture is not easy to lose, and it is easy to produce wet damage, so it can not be flooded with flood, but should be watered frequently with small water. Improper fertilization is also a key factor leading to abnormal fruit. The fruiting period of strawberry in greenhouse is long, and there is more demand for nitrogen, phosphorus and potassium. Insufficient organic fertilizer, partial application of nitrogen fertilizer or improper application of nitrogen fertilizer can easily lead to excessive growth of branches and leaves, poor ventilation and light transmission of plants, and aggravate the occurrence of abnormal fruits. On the basis of heavy application of organic fertilizer, attention should be paid to the application of phosphorus and potassium fertilizer instead of ammonium bicarbonate.