Author(s):

Aatheeswari R, Suresh S, Ramanathan SP and Jeberlin Prabina B

Abstract: A field experiment was conducted in the Thamirabarani tract of Tamilnadu during pishanam season of 2018-2019 to study the effect of different INM practices on soil fertility, rice productivity and profitability in a sandy clay loam soil, Thamirabarani tract of Tamilnadu. The experiment was laid out in a randomized block design with 9 treatments and 3 replications. The results revealed that among the different INM practices STCR-IPNS along with application of biofertilizers on 15^th& 30^th days after transplanting recorded the highest productivity and profitability, followed by STCR-IPNS with basal application alone treatment. The same treatment recorded the highest yield (7.70 t haˉ¹) as well as nutrient uptake besides profitability (Rs.386 haˉ¹ dayˉ¹) over the other treatments. The yield attributes were also improved by the same treatment. The STCR-IPNS treatment with biofertilizers (basal, 15^th& 30^thDAT) improved the soil available nitrogen, phosphorous, potassium and organic carbon after the harvest. The same treatment recorded the highest net return of Rs.42,436 haˉ¹. Among the INM treatments 75 % RDF + GLM @ 6.25 t ha¯¹ + biofertilizers- (basal 15^th& 30^th DAT) recorded the lowest net return of Rs.32,356 haˉ¹.

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