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 field trial, conducted in Thailand, tested the effect of three foliar applications of multi-npK (13-3-43) as the rice fertilizer, compared to the traditional growing method. The results: increased yield and revenue