Split application of K is useful in high rainfall areas to save on

Answer: Option C

Split application refers to the utilization of a sequence of two or more nutrient applications, separated by approximately three weeks or more, to a single crop to improve nutrient uptake efficiency.
Split application of K (Potassium) is useful in high rainfall areas to save on Leaching. Leaching makes the nutrients lost from the top layer by percolation or heavy rain.