Nutritional diagnosis of sulfur in soybean plants
Soybean cultivation is expanding rapidly into the northeastern areas of Brazil and a study on soil fertilization in the region is necessary to serve as a basis for soil management. The criteria to maintain appropriate contents of nutrient elements in the plants should be studied. The supply of sulfur (S), manganese (Mn), zinc (Zn), boron (B) and copper (Cu) in two cerrado soils of the region was studied. The first limiting factor for soybean growth was S-deficiency in both the soils. The S concentration in the 3rd leaf at the flowering and in the grains at harvesting varied in a 1:1 ratio. Both concentrations were categorized from a point of grain production and of its protein composition. The classification was as follows: Severly lacking in case less than 1.0 g/kg; lacking at the range from 1.0 g/kg to 2.0 g/kg; low from 2.0 g/kg to 2.3 g/kg; and the normal at more than 2.3 g/kg. To obtain a satisfactory yield, the sulfuric material should be applied until the S concentration in 3rd leaf and/or grains becomes as high as 2.3 g/kg.
Japan International Research Center for Agricultural Sciences Research Information Division
Brazilian Agricultural Research Corporation
- Term of research
- Responsible researcher
HITSUDA Kiyoko ( Research Information Division )
- Japanese PDF