Impact of Site Specific Nitrogen Management on Growth Parameters, Productivity and Profitability of Kharif rice
S. Sahoo *
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
B. K. Mohapatra
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
R. K. Paikaray
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
S. N. Jena
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
B. S. Rath
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
S. Biswal
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
R. K. Panda
Department of Plant Physiology, CA, OUAT, Bhubaneswar, India.
K. N. Mishra
Department of Soil Science and Agricultural Chemistry, CA, OUAT, Bhubaneswar, India.
S. Dwibedi
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
A. K. Nayak
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
R. R. Mahanta
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
T. P. Das
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
Nishith Das
Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar-751003, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was carried out during kharif 2021 (June-November) and 2022 (June-November) at the Agronomy Main Research Farm, Department of Agronomy, College of Agriculture, OUAT, Bhubaneswar. The experiment was laid out in randomized complete block design with twelve treatments 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). Pooled analysis revealed that application of 20 kg N ha-1 at Green seeker (GS) >1.25 RI with 20 kg N ha-1 at basal recorded maximum dry matter accumulation (1194.1 g m-2), larger leaf area index (3.30), highest number of tillers (381 m-2) at harvest and maximum CGR of 18.73 g m-2 day-1 during 60 to 80 DAT followed by the treatment receiving 20 Kg N ha-1 at SPAD value <35 with 20 Kg N ha-1 at basal. Combined analysis of both years showed that 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 %) with maximum net return 55982 Rs ha-1 and B:C ratio 1.82.
Keywords: LCC, SPAD, green seeker, CGR, productivity, profitability