In Rice-Wheat Cropping system, K should be applied in

The rice-wheat cropping system is India’s most widely adopted cropping system practiced on an estimated area of around 26 million hectares predominantly in Uttar Pradesh, Punjab, Haryana, Bihar, West Bengal, etc.
In the rice-wheat cropping system, potassium should be applied to Rice only, as a lack of balanced availability of nutrients is there in submerged rice cultivation.