抄録
The effect of chisel tillage on the growth and yield of spring wheat seeded in early winter was studied.
1) Spring wheat seeded in early winter germinated under snow and their roots extended more than 30cm during snow season. These growth of roots in snow season promoted sufficient growth of spring wheat in early stage after thawing. The yield of spring wheat seeded in early winter was more than that of wheat seeded in spring.
2) Chisel tillage which broke the soil roughly was possible to adopt the early winter seeding method of spring wheat because the germination of spring wheat occured under snow without moisture stress.
3) The yield of spring wheat of chisel tillage was equal to or more than that of rotary tillage because of the large number of grain per ear and 1000 grain weight.
4) Chisel tillage made ununiform soil physical conditions consisted from tilled and untilled part. The roots distribution of spring wheat concentrated to the tilled part. It seemed that the precipitation and fertilizer also concentrated to tilled part and spring wheat absorbed it efficiently.
