Performance of transplanted rice under modified conventional system over system of rice intensification
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Date
2020
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Department of Agronomy, BAU, Sabour
Abstract
The system of rice intensification (SRI) is not being popularized among the farmers community due to its several complications. The farmers are still believed in conventional transplanted rice for their daily needs. However, there are some specific components of SRI seems to be effective in accelerating the productivity. The research was conducted at Bihar Agricultural University, Sabour during kharif 2019 on transplanted rice in combination with the SRI components to identify the most favorable technique for optimum grain yield. The eight treatments were incorporated as T1 = Conventional PTR (CPTR); T2 = CPTR with 12 days seedling; T3 = CPTR with spacing of 25 cm × 25 cm; T4 = CPTR with single seedling/hill; T5 = CPTR with N-Organic:Inorganic::50:50; T6 = CPTR with Saturation water management; T7 = CPTR with weed management through mechanical rotating hoe; T8 = All component of SRI in randomized block design replicated thrice. The recommended dose of fertilizer was 120:60:40 kg N:P2O5:K2O ha-1 and the general spacing were maintained as 20cm × 15cm. The growth attributes like plant height, leaf area index and plant biomass were found significantly higher under SRI (T8) treatment over the CPTR and in parity with PTR using 12 days old seedlings (T2). The highest yield attributing characters like tillers m-2, panicles m-2 and grains panicle-1 were also recorded higher in SRI (T8) treatment. The grain yield) under SRI (6020 kg ha-1) was found maximum and statistically at par with T2 and significantly higher over CPTR (T1). The lowest grain yield (4413 kg ha-1) was recorded with CPTR with saturation water management. The N, P, K uptake in grain and straw was higher obtained under the SRI treatment (T8). The highest Gross Return (Rs. 122650 ha-1) was recorded under SRI, which was found statistically at par with CPTR with 12 days seedling (Rs. 116281 ha-1) and CPTR with single seedling/hill (Rs. 109330 ha-1). However, the net returns (Rs.78975 ha-1) was recorded maximum with CPTR with 12 days seedling, which was statistically at par with conventional PTR (Rs.70866 ha-1), CPTR with one seedling/hill (Rs.72024 ha-1) and CPTR with spacing of 25 cm × 25 cm (Rs. 68840 ha-1). The net return under SRI showed significantly lower than that of CPTR with 12 days seedlings and it was mainly due to the high cost of cultivation in SRI technique. The return per Rs. invested showed the real scenario of SRI technique where it was found significantly lower than most of the treatments except CPTR with organic manure (T5) and saturation water management (T6). The maximum return per Rs. invested was recorded in CPTR using 12 days old seedlings (2.12) which was found at par with conventional PTR (1.90), CPTR with one seedling/hill (1.93), and CPTR with spacing of 25 cm × 25 cm (1.85). The cost of organic manure was the main burden in SRI technique for high cost of cultivation and low return. The study suggested that though the SRI alone recorded the highest yield but the net return and return per rupee invested were obtained significantly higher in CPTR with 12 days seedling (22% and 53%) when compared to that of SRI alone. Hence it can be concluded that the CPTR with 12 days seedling treatment can be useful for higher rice productivity and economic return.