SOYBEAN GUIDE OF FIELD MANAGEMENT & FERTILIZATION
Oct 17, 2016

SOYBEAN

Soybean is a species of legume native to East Asia, widely grown for its edible bean which has numerous uses. The plant, classed as an oilseed rather than a pulse by the UN Food and Agriculture Organization, produces significantly more protein per acre than most other uses of land.

Fertilization

The normal growth of soybean needs nitrogen, phosphorus and potassium nutrient requirements, followed by calcium, sulfur, magnesium and trace elements such as molybdenum, boron, zinc and so on.

Nitrogen  - From the branch heavily, the uptake and accumulation of nitrogen increased gradually along with the plant growing, will bean-filling reached the maximum.

Soybean contain symbiotic bacteria called Rhizobia within nodules of their root systems. These bacteria have the special ability of fixing nitrogen from atmospheric, molecular nitrogen (N2) into ammonia (NH3). Ammonia is then converted to another form- ammonium (NH4+). So soybean can absorb nitrogen from the air to meet their own needs for the growth of 2/3, the other 1/3 should get from soil and fertilizer.

Phosphate  - The phosphate uptake peak of soybean is from branch heavily to pod initiation and uptake not much more from nursery to flower initiation but great impact to the whole growth period.

Potassium  - The potassium uptake was higher in early growth stage, and reach the peak after pod initiation.


Suggested fertilizers

NPK10-15-10+1.5CaO+TE(+0.7%MgO+0.01%Mo+0.3%Zn+0.3%B+7%Cl) 

     Application stage: Branch heavily, flower-pod initiation to bean filling stage.

     Fertilization method: Site (top) dressing.

NOP13-0-46 + MAP 12-61-0

     Application stage: Flower-pod initiation to bean filling stage.

     Fertilization method:  Foliar nutrition.

NPK12-12-17+2MgO (12.68%Cl)

     Application stage: Bean filling stage to harvest.

     Fertilization method:  Site (top) dressing.