Fertilization characteristics and fertilization techniques of sunflower

First, the need for fertilizer characteristics

Approximately 100kg each producing sunflower seeds as n3.3 - 6.1kg, p2o51.5 - 2.5kg, k2o6.3 - 13.9kg. Sunflowers need potassium higher than other crops. Sunflowers from the bud to the flowering, especially the formation of flower discs to flowering is a critical period for nutrient absorption.

There is more phosphorus in the period from emergence to flower formation, and more nitrogen is needed from the formation of the flower disc to the end of flowering. The flower plate is formed to absorb more potassium during the waxy stage.

Second, fertilization technology

Basal: organic fertilizer, with the application of chemical fertilizers, decomposition of organic fertilizer per acre of 1500 - 2000kg, can applicator, banding.

Types of fertilizer: nitrogen application per acre 2.5 - 4.5kg, pure phosphorus 1 - 2kg, pure potassium 7.5kg. Also for fertilizer applied once or diammonium phosphate Fertility case 15 - 20kg.

Top dressing: Sunflower topdressing should be carried out before the buds. The growth of the seedlings and general characteristics may be applied to variety Urea 15 - 25kg, or applying special fertilizer, fertilizer 25 - 30kg.