G Mahajan and M P S Khurana
Enhancing Productivity of Dry-Seeded Rice (Oryza sativa L.) in North-West India Through Foliar Application of Iron and Potassium Nitrate
Low dry matter translocation towards grains in dry-seeded rice (DSR) during the postanthesis period is one of the causes of yield penalty in DSR especially in coarse textured soils as compared with puddle transplanted rice. This study was undertaken to evaluate the effects of KNO3 and Fe foliar fertilization for enhanced productivity of DSR in coarse textured soils of north-west India during 2011 and 2012. Seven foliar application treatments [0, 1% Fe (twice), 1% Fe (thrice), 1% KNO3 (single), 1% KNO3 (twice), sequential spray of 1% Fe (twice) and 1% KNO3 (single), sequential spray of Fe (twice) and KNO3 (twice)] were used. The experiment was conducted in randomized complete block design with three replications. Grain yield in DSR varied from 4.5 to 7.0 and 6.1 to 8.2 t ha-1 during 2011 and 2012 respectively. During both the years, lowest grain yield was noticed in untreated control. Highest grain yield was found with sequential foliar application of Fe (twice) and KNO3 (single) and this treatment showed superiority among all the treatments during both the years. Grain yield with sequential foliar application of Fe (twice) and KNO3 (single) increased to the extent of 56 and 35% as compared to untreated control during 2011 and 2012 respectively. Foliar application resulted in an increase in LAI, root weight and volume that caused enhanced uptake of N, K and Fe. Grain number panicle-1 with sequential foliar application of Fe (twice) and KNO3 (single) were found to increase by 46 and 26% as compared to untreated control during 2011 and 2012 respectively. It was concluded that sequential foliar application of Fe (twice) followed by KNO3 (single) is beneficial to increase the sink size and finally grain yield in DSR..
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