This project belongs to the field of green leafy vegetable cultivation technology and variety selection.
Letucine, including wrinkled leaf lettuce and head lettuce, originated in Europe and the United States. It is the most important green leafy vegetable and export-oriented vegetable in this city, which is mainly eaten freshly. Due to the short history of cultivation and production, as well as the lack of scientific cultivation and processing production techniques and excellent heat-resistant, disease-resistant and stress-resistant varieties, the main production areas not only have extensive production management and short production seasons, but also have serious diseases, low yields and finished products, and unstable quality. The project team started from the optimization and integration of variety structure, cultivation density, fertilization level, disease prevention and insect control techniques, seedling breeding techniques, harvesting techniques, processing and packaging techniques, and product quality control techniques, as well as the breeding of heat-resistant, disease-resistant and stress-resistant varieties, and established a systematic and standardized head lettuce production and processing technology system, created head lettuce product quality standards and local standards for production and processing technical operation specifications, and bred new varieties of heat, cold, and disease resistant lettuce. Implementation and application have achieved remarkable results. Significantly improved the production technology level of Jinshan District, the main producing area of head lettuce, and other producing areas in the city, and significantly increased output and efficiency. Basically realizing the annual production of head lettuce, significantly enhancing the supply capacity and market competitiveness of market products themselves, with significant economic and social benefits.

1. Breeding a heat-resistant and disease-resistant wrinkled leaf variety Shenxuan No. 1: This variety is highly resistant to downy mildew and soft rot, and is heat-resistant. Compared with the original variety, the yield is increased by 163%, and the bolting is late for 7 days. It is suitable for cultivation in spring, summer and autumn in this city. Compared with the similar domestic main variety "Fangni Da Fast Growing", the yield increased by 8%. It has been promoted in large areas in this city, East China, North China and other large areas, with a total promotion area of 12,600 acres, an increase of 10% compared with the local average, and the production area in this city accounts for more than 35%.
2. Cultivated heat-resistant and disease-resistant cotton-leaf-type ball variety Shenxuan No. 4: This variety is highly resistant to downy mildew and sclerotiorum, and is heat and cold. Compared with the original variety, the yield is increased by 2.4 times, and the bolting is late for 7 days, which is suitable for summer and winter cultivation in this city. Compared with the domestic main cultivated variety of the same kind "tender green milk leaf lettuce", the yield increased by 15.13%. It has been promoted in large areas in this city, East China, North China and other large areas, with a total promotion area of 9,700 acres, an increase of 14.5% compared with the local average, and the production area in this city accounts for more than 50%.
3. A systematic and standardized lettuce production and processing technology production system has been created, and standardized technical specifications have been formed: this system includes safety production control technology, as well as cultivation, harvesting, processing, packaging, storage and transportation technologies. Compared with similar domestic technologies, a reasonable annual production stubble model and variety structure have been formed. It is more reasonable, effective, scientific and advanced in production links such as fertilization technology, cultivation density, and pest control. The overall level of the technical specifications formulated ranks at the leading level among similar domestic research. This has increased the output level in the main producing areas by 26.4%, the finished product yield by 11%, the use of chemical fertilizers has been reduced by 10%, and the use of pesticides has been reduced by 20%.
4. Create local standards for the quality of head lettuce products: Take the lead in formulating quality standards for head lettuce pre-packaged products in China, and specify the health quality requirements, test methods, inspection rules, and technical requirements for marking, packaging, transportation, storage, etc. Requirements have been stipulated, technical indicators are in line with international standards, and the overall level of the standard ranks at the leading level among similar domestic research. The overall improvement in the quality of lettuce products in this city has been achieved, and the level of market trade competition has been significantly improved. The quality pass rate of products in the main producing areas is 100%, and the export products reach 30,000 tons.
   This project has passed 2 new variety certifications and 2 local standards approvals. The No. 1 and No. 4 varieties applied for this project have been widely promoted and applied in this city, East China and North China, promoting the optimization of local variety structure and production development, with a total promotion area of 21,000 acres. 2012-2014 In 2001, the cumulative added output value was 59.8575 million yuan, the profit was 44.8931 million yuan, and the expenditure was saved by 598,600 yuan. The technical specifications and standards of this project are implemented and applied in Jinshan District, with significant economic benefits. 2012-2014 In 2001, the cumulative added output value was 14.95 million yuan, profits were 9.35 million yuan, foreign exchange was generated 6 million yuan, and expenditures were saved 433,000 yuan. Published 6 papers. Significant economic and social benefits.