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Split application makes potassium available at peak crop requirement period whereas basal application appeared to accommodate maximum demand at initial growth stages resulting into fixation and other losses. To assess the most suitable and economic ways of potassium application on growth and yield of transplanted paddy in north-eastern plains of India, an experimented was conducted during 2017-18, to evaluate the performance of different levels of potassium applied at different times. The experiment was laid out in split plot design with 3 replications consisting of three levels of potassium application i.e. K1100% RDK (40kg), K2-150% RDK (60kg) and K3-200% RDK (80kg) at four different times i.e. S1 (basal), S2 (50% basal + 50% at max. tillering), S3 (50% basal + 25% at max. tillering + 25% at PI) and S4 (75% as basal + 1% spray at maximum tillering and PI). The results revealed that with increase in the level of potassium, significant positive effects on all the growth parameters and yield attributes were observed whereas potassium application with S3 showed better crop performance. Increased level of potassium (200% RDK) recorded significantly higher grain yield (4999 kg ha) and straw yield (8488 kg ha). Thus, levels of potassium in paddy may safely be increased up to 200% for maximizing yield potential as well as net profit and it should be applied in split doses with 50% of it as basal, 25% at max. tillering and rest 25% at panicle initiation.

Enhancing growth and yield potential of paddy through potassium application in North-Eastern plains of India