Four field trials performed in Vietnam during the spring and summer of 2009 showed that rice growers can significantly increase their yields and enjoy higher income by enriching crop nutrition with one or more foliar application of potassium nitrate.
Foliar application of potassium nitrate increased yields by 15%. Farmers' net income was increased by 13%.

The trials wew conducted by PNA and carried out by  Dr. C. Witt, Director of IPNI South East Asia program, and Dr. Thuc Son from SFRI, Hanoi.

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