Rice (Oryza sativa L.) yield and potassium use efficiency as affected by potassium fertilizer sources

Abstract

Enhancing potassium use efficiency (KUE) is vital for sustainable rice production. In a pot experiment, T1 (Canada origin) significantly outperformed T2 (Morocco origin) in grain yield for BRRI dhan 61 (7205 kg ha-1), BRRI dhan 68 (6050 kg ha-1), and BRRI dhan 28 (4227.3 kg ha-1). BRRI 61 exhibited superior filled grain and 1000 grain weight under T1. In T1-treated soil, BRRI 61 recorded the highest grain K uptake (63.56 kg ha-1), surpassing BRRI 68 and BRRI 28. With T1, BRRI 61 demonstrated 1.24 and 2.70 times greater agronomic efficiency than BRRI 68 and BRRI 28, respectively, along with a crop recovery efficiency of 0.42. T1 treatment improved agronomic traits across varieties. Recommending T1 fertilizer for BRRI 61 is suggested to optimize yield, K uptake, and use efficiency, emphasizing its potential for sustainable rice cultivation.