Vermiculite is a natural, non-toxic minerals under high temperature expansion of the mineral. It is a relatively rare mineral, is a silicate. Its crystal structure of the monoclinic system, from the appearance, it looks like mica. Vermiculite is a generated when certain granite hydrated. It is generally asbestos. Vermiculite ion exchange capacity, its soil nutrients have a great role. 
 Vermiculite characteristics: 
 Vermiculite chemical formula of (Mg, Ca) 0.7 (Mg, Fe, Al) 6.0 [(Al, Si) 8.0] (OH4.8H2O). Monoclinic system, usually flaky. Brown, brown or bronze. Oil sheen. Hardness 1 to 1.5. Density of 2.4 to 2.7g/cm3, vermiculite calcined at 800 ~ 1000 ℃, Volume rapid expansion, increasing from 6 to 15 times, as high as up to 30 times. The average bulk density of the expanded vermiculite to 100 ~ 200Kg/m3 small roasting swelling of vermiculite air compartment, it has excellent insulation properties. The vermiculite Model :1-3mm ,2-4mm ,4-8mm ,10-20 mesh ,20-40 mesh ,40-60 mesh ,80-120 mesh ,120-160 mesh ,160-200 mesh. 
 Plug seedlings in light matrix material such as peat, vermiculite for seedling matrix, using precision sowing time into a seedling nursery. 
 Plug seedlings in light matrix material such as peat, vermiculite for seedling matrix, using precision sowing time into a seedling nursery. Plug seedlings can also be used with modern greenhouse technology, soilless cultivation technology, machinery and automation technology, computer management technology supporting implementation of the industrialized breeding. The technology is applicable to large-scale, specialization and commercialization nursery. 
 (1) selection of a suitable matrix plug. The main raw material for the preparation of the matrix of peat and vermiculite. Peat optional requirement the surface waxy better water absorption, pH value of about 5.0. Optional vermiculite requirements particle diameter of 2 to 3 mm, good foam. Peat, vermiculite mixed ratio of 2:1 crushed sieved use added 15:15:15 NPK compound fertilizer 2.5 to 3 kg per cubic meter matrix. Can also directly purchase the preparation of a good dedicated matrix. The plug can be chosen according to the characteristics of different vegetables, nursery, such as cucumber, watermelon, the choice of the 50-hole or 72-hole disk; tomato, eggplant optional 72 cavities tray, green peppers and in cooked cabbage optional 128 hole plate, celery is generally used in 288 holes and The 392 hole plug, rape, lettuce general selection 288 hole of Plug. 
 (2) the matrix Zhuangpan and planting. Plug before you use the Clear Plug residual stromal, rinse with water, dried, and then placed in a sealed room, trays ignited after fumigation with sulfur powder, sawdust mixed. Hand-planting should first nursery substrate mounted in plug, scraping excess matrix per hole and then hit a deep hole, dry seeding. Single cavity after sowing, casing, casing with finer vermiculite, placed in a germination chamber primed with a watering can spray permeable. A few days after the buds to be planted just unearthed about trays placed on a prepared seedbed nursery greenhouse. 
 (3) the seedling stage management. The plug seedlings hole distance between the small, dense vegetable shoots strengthen pre-management. Water management is the key to the success of the nursery, water control approach taken during the entire nursery seedling plug is not wet quit, to ensure that the seedlings are not wilting, not leggy. Nursery seedlings growing during the inverted plate, so that the growth of seedlings evenly. Do a good job in the management of temperature, humidity and other vegetable species and growth stages.