Comparison of potassium absorption, yield and quality between high-oil and common corn affected by potassium application Effect of K application method on K absorption and yield of sweet potato Studies on Potassium Absorption Characteristics of Different Growing Year Alfalfa(Medicago Sativa L.) Effect of potassium application rate on potassium absorption, distribution and yield of spring maize under different soil fertilities Effects of application of potassium fertilizer and straw on crop yields and soil potassium balance in low-yielding fields