Effect of Site Specific Nitrogen Management on Grain Quality and Productivity of kharif Rice

Abstract

A field study was carried out during kharif at the Agronomy Main Research Farm, Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar with the crop rice. The experiment was laid out in randomized complete block design with twelve site specific nitrogen management practices i.e. T1-RDF (80:40:40 kg N:P2O5:K2O ha-1), T2 - 20 kg N ha-1 at LCC score <4 with no basal N, T3 - 20 kg N ha-1 at LCC score <4 with 20 kg N ha-1 at basal, T4 - 20 g N ha-1  at SPAD value <35 with no basal N, T5- 20 kg N ha-1 at SPAD value <35 with 20 kg N ha-1 at basal, T6- 20 kg N ha-1 at Green seeker (GS) >1.25 RI with no basal N, T7- 20 kg N ha-1 at Green seeker (GS) >1.25 RI with 20 kg N ha-1 at basal, T8- 150 kg N ha-1 (N rich strip plot), T9- N omission plot, T10- STBN, T11- INM (20 kg N ha-1  as FYM at basal + 40 kg N ha-1  at tillering + 20 kg N ha-1  at PI stage), T12- Organic nutrient (FYM 10t ha-1 at basal + 2t ha-1  VC top dressing). The result of the experiment revealed that protein and carbohydrate yield were higher with application of 20 kg N ha-1 at Green seeker (GS) >1.25 RI with 20 kg N ha-1 at basal (410.4 and 4135.1 kg ha-1, respectively) followed by the treatment receiving 20 Kg N ha-1 at SPAD value <35 with 20 Kg N ha-1 at basal (395.5 and 3977.2 kg ha-1, respectively). Application of 20 kg N ha-1 at Green seeker (GS) >1.25 RI with 20 kg N ha-1 at basal recorded significantly higher grain yield (5.68 t ha-1), straw yield (6.57 t ha-1) and harvest index (47 %) followed by 20 kg N ha-1 at SPAD value <35 with 20 kg N ha-1 at basal.