Application Research Of Flue-cured Tobacco Seedling Culture In Sand-cultured Floating System

In 2007, 10 types of Mountain sand from Mouding County of ChuXiong were used as a seeding material, and a mixed material for CK. Base on seeding experiment on sand, field demonstration of transplanting contrast, Emergence, physical and chemical properties, growth duration after transplant, the output value of analysis of Tobacco Seedlings from different types of sand growth period, investigation and nursery costs and resource evaluation, selection for sand culture of the sand floating nursery, for the promotion of Mouding County, 100% sand culture floating nursery do demonstrations, The main conclusions of the study are as follows:1. PH of Sand and the main heavy metals on Tobacco Seedlings affect the growth and development. pH and effectively lead, manganese content in germination rate and a negative correlation between the performance of its relevance to: pH value> effectively lead> manganese content, but the germination rate among the impact of the difference in time, effectively lead, manganese Content is the beginning of the emergence of an impact on germination rate and the pH value on the impact of Emergence mainly reflected in the emergence in the latter part of the process. Breeding experiments showed that pH between 6.5-7 is of most appropriate.2. Sand main physical properties of the Tobacco Seedlings affect the growth and development. The absorbent sand and water from the gas permeability of the sand particle size, density, porosity of the decision. Sandy's size and density, porosity and the positive correlation between the presence of Emergence, the correlation between the size of: size> total porosity> density. 0.5-2mm diameter test showed that the sand volume of the total volume of 60-70%, bulk density 1.54-1.58g/cm~3, porosity of 37-41% for the best, sand and water holding capacity of ventilation, and by nurturing seedlings sand culture of high germination rate, less spiral root, root developed, stout stem and root dysplasia or death situation after emergence tobacco seedlings less.3. Main technical measures on the sand nurturing seedlings seedling cultivation of the impact. Requirements:â‘ Water content of sand is appropriately, the water content as 20% is appropriate;â‘¡Scientific management of water. From planting to emerge, and maintain deep-water breeding 1-1.5cm, germination rate can reach 94.0%, in period of cross-shaped, adding 10cm deep nutrition and access to the entire floating nursery;â‘¢Ensure that the pool surface level. In the period before the Grand Cross of the need to control breeding pools plane error within less than three millimeters, ensuring water (nutrition) distribution and supply of uniform to ensure that the seedlings is strong and uniform.â‘£Manure management. Grand Cross ago, after the emergence of fertilizer to every 4-5d, adding 0.2% of the nutrient solution processing, Tobacco Seedlings of better, more than 1.0 percent of the nutrient solution, Tobacco Seedlings significantly inhibit the normal growth. Grand Cross of the late into the floating stage, fertilizer management in line with the existing floating nursery.4. Through the sand different kind of seedbed germination rate, the results showed that: Treatments of No. 1,2, 8 are better than CK. processing, Treatment 5 and CK is same, and the deal with mixed matrix control no significant difference. Floating sand culture of a seedling nursery and the control line. Seedling its biological characteristics can meet or slightly better than CK, sand culture floating above ground and underground on value of D/F higher than the CK; Particularly the ground floor of the dry matter accumulation, root cap than large, floating sand culture seedling nursery produce more floating the Tobacco Seedlings developed root system, robust growth. The sand handling and control growing field basically the same, in growth duration after transplant, biological characteristics and major agronomic traits compared with no difference. The handling and control the output of small differences.5. Sand culture floating nursery costs and resource assessment. Tobacco drifting sand culture seedling nursery comprehensive than the existing cost-section of floating nursery reduce the cost of 169.20ï¿¥/hm~2, sand as an alternative nursery materials, with conservation of resources, extensive source material, low cost and is conducive to environmental protection, social and economic benefits, such as significan Advantages. Tobacco sand culture promote the use of floating nursery can greatly reduce the cost of breeding, replace the existing flue-cured tobacco floating nursery matrix, protect the ecological environment, tobacco production has an important and far-reaching significance, has broad application prospects.