Effect of substrate and nutrition on growth, development, yield and quality of strawberry (fragaria x ananassa) grown under greenhouse conditions in Da Lat
The strawberry (Fragaria × ananassa) was introduced to Vietnam by the French in the 1940s and was grown in Lam Dong. Although being an imported crop, strawberries have grown and, developed, brought high yield and quality, and become one of the specialty crops of Dalat. Strawberry cultivation in the...
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| Định dạng: | Doctoral thesis |
| Ngôn ngữ: | Vietnamese |
| Được phát hành: |
Vietnam Academy of Agricultural Sciences
2023
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| Những chủ đề: | |
| Truy cập trực tuyến: | https://scholar.dlu.edu.vn/handle/123456789/2595 |
| Các nhãn: |
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| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
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| Tóm tắt: | The strawberry (Fragaria × ananassa) was introduced to Vietnam by the French in the 1940s and was grown in Lam Dong. Although being an imported crop, strawberries have grown and, developed, brought high yield and quality, and become one of the specialty crops of Dalat. Strawberry cultivation in the open field had been popularly applied in Da Lat until 2012. In such conditions, strawberries were grown on the soil bed and were directly influenced by sunshine, rain, dew, and wind... The temperate tropical climate, a lot of rain, and warm weather are ideal conditions for pathogenic fungi to grow on strawberry plants. Besides, due to the high investment in intensive farming, the abuse of fertilizers and plant protection chemicals, the diseases on strawberry plants in Lam Dong became increasingly serious. In early 2012, the total strawberry growing area decreased markedly to only 40 ha (22% of the area of strawberry cultivation in 2009). The methods of growing strawberries on substrates in the conditions of domed houses, plastic houses, greenhouses have been strongly developed in the world (France, Mediterranean, Spain, Italy). Due to growing on indoor substrates with controlled moisture, strawberries give higher yield and quality of fruit, and the level of infection with some fungi is also lower than grown under natural conditions. The adoption of this model into production in Da Lat will contribute to overcoming the current production difficulties, and at the same time, it is also consistent with the orientation of advanced technology applications for agricultural development in Vietnam in general and Lam Dong province in particular.
Currently, many farmers and businesses have applied the cultivation method of strawberries on the substrate in Lam Dong, but with low results and facing some difficulties. First, imported substrates are very high price and scarce. There is no research in Vietnam and no professional producer of substrate for strawberries. Second, the nutrient solution plays a major role is in hydroponic production. However, there are currently no studies and publications on the nutrient solution for strawberries in Vietnam. Therefore, it is necessary to select and mix locally available materials, to create substrate grow strawberries, and determine a suitable nutrient solution for strawberries in the greenhouse in Lam Dong.
Three types of materials were used: cocopeat, rice hulls, and rice husk charcoal to mix with different ratios to create a suitable substrate for strawberries to grow and develop.
This study inherits several nutritional formulas of scientists around the world and focuses on researching the effects of concentrations of 5 elements, including N, K, Ca, B and Zn, on the growth, development, yield, and strawberry quality. The research was conducted from May 2014 to March 2018.
The project has made the following new contributions:
- The topic has determined the relationship between the ratio of materials in the substrate (coconut peat, rice husk, rice husk charcoal) with the physical properties of the substrate, which is the basis for mixing to create a suitable substrate. meet the needs of the crop and the requirements of the grower;
- Based on the relationship between the growth criteria, the yield criteria with the physical properties of the substrate, and the ratio of the composition of the materials in the substrate, the topic has proposed the substrate (mixing from 25% rice husk and 75% coco peat) is most suitable for strawberry plants to grow and develop, with high yield and reasonable price, abundant supply.
- The topic has generalized the relationship between the growth, development, yield, and quality indicators of strawberries with the concentration of nutrients N, K, Ca, Zn, Bo in the environment. Strawberry hydroponic nutrition school. On that basis, it can apply to determine the nutrient environment to achieve predetermined growth, development, yield, and quality parameters. |
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