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A field experiment was redacted at Instructional Farm, BCKV, West Bengal, India during kharif (rainy) season of 2018 to evaluate the efficacy of seaweed extracts on growth, yield and economics of rice. The experiment was framed in RBD comprising 7 treatments (T1- 100% RDF, T2 -100% RDF + Biozyme granule @15 kg/ha, T3 -100% RDF +Amaze-x granule @ 10 kg/ha, T4 -75% RDF + Biozyme granule @ 15kg/ha, T5 -75% RDF +Amaze-x granule @ 10 kg/ha, T6 - 75% RDF + Biozyme granule @ 15 kg/ha + Proventus DS legacy spray @ 625ml/ha, T7 -75% RDF +Amaze-x granule @10 kg/ha + Proventus DS legacy spray @ 625ml/ha), replicated thrice. Experimental findings revealed that highest growth and yield attributes of rice were observed under application of 75% RDF +Amaze-x granule @ 10 kg/ha + Proventus DS legacy spray @ 625 ml/ha (T7). Maximum grain (3.90 t/ha) and straw (5.94 t/ha) yields of rice and high nutrient uptake (N: 91.45 kg/ha, P2O5: 11.49 kg/ha and K2O: 190.74 kg/ha) were also ensured under treatment T7. However, 75% RDF + Biozyme granule @ 15 kg/ha + Proventus DS legacy spray @ 625ml/ha (T6) remained as second best option after T7. Further, high economic viability was exhibited by both the treatment T6 (BCR: 1.59) and T7 (BCR: 1.58). Therefore, application of 75% RDF and Proventus DS legacy spray @ 625ml/ha along with either Biozyme granule @ 15 kg/ha or Amaze-x granule @ 10 kg/ha can be recommended for achieving best growth, yield and economics of kharif rice.

Effect of seaweed extracts on growth, yield and economics of kharif rice (Oryza sativa L.)