Effect of organic sources of nutrients application on productivity and economics of cotton

摘要

Field experiments were carried out at Tamil Nadu Agricultural University, Cotton Research Station, Srivilliputtur during August to January 2017-2018 and 2018-2019 to study the effect of various organic materials on growth, yield and economics of cotton variety SVPR 4 under irrigated conditions. The experiments were conducted in randomized block design with three replications. Eleven treatments consisted of an absolute control (T_1- No organic and inorganic), control (T_2 - RON through inorganic). Recommended dose of nutrient through organic based on P equivalent basis (T_3), Seed treatment and soil application of bio fertilizers with foliar application of PPFM (T_4, Neem cake application at 250 kg/ha (T_5), Raising of sunnhemp and incorporation before flowering (T_6), In situ - incorporation of green gram (T_7), Combination of seed treatment and soil application of bio fertilizers, PPFM and neem cake (T_8), Combination of seed treatment and soil application of bio fertilizers, PPFM and sunnhemp incorporation (T_9), Combination of seed treatment and soil application of bio fertilizers, PPFM, neem cake and sunnhemp incorporation (T_(10)), Combination of seed treatment and soil application of bio-fertilizers, PPFM, neem cake and intercropping with green gram (T_(11)). The results revealed that taller plants, higher monopodia, sympodia, bolls / m~2 and boll weight were associated with the application of recommended dose of inorganic fertilizers but this was comparable with all other organic applied treatments and significantly higher than absolute control. Though the application of inorganic fertilizers recorded the highest seed cotton yield (1790 kg/ha in 2017-2018 and 1875 in 2018-2019), its effect was on par with that of combined practice of seedtreatment, neem cake application, sunnhemp incorporation, soil application of bio fertilizer and foliar application of PPFM (1701 and 1748 kg/ha during 2017-2018 and 2018-2019, respectively) and also combined practice of seed treatment, sunnhemp incorporation, soil application of biofertilizer, foliar application of PPFM and intercropping of green gram during both the years of study. The economic analysis revealed that higher gross income and net income were associated with inorganic fertilizer application followed by combination of seed treatment and soil application of bio fertilizers, PPFM, neem cake and sunnhemp incorporation.