As a micronutrient, Zinc is essential for enzyme activation in plant cells. It is also helpful during protein synthesis, formation of chlorophyll and production of carbohydrates. The most important role of Zinc however is improving the pollen quality and extending the life of viable pollens. Better pollens result in better seed setting and thus increased grain fill.
In order to increase the weight of the grains, potassium plays an important role as it is essential for photosynthesis process and contributes in formation of food. Potassium also controls closing and opening of stomata which is essential to maintain proper water balance in the crop..
Balanced application of Potassium and Zinc enhances grain filling and weight.