title: Productivity potential and monetary evaluation of Bt cotton hybrids under varied agronomic manipulations in semi-arid conditions.
abstract: Field experiments comprising three Btcotton hybrids in main, two plant geometries in sub and three nutrient levels in sub sub plots of Split Plot design replicated thrice were conducted at PAU, Regional Research Station, Faridkot during Kharif 2010 and 2011. MRC7361 recorded significantly the highest SCY (3121.6 kg ha(-1)) followed by Bioseed 6488 (2649.5 kg ha(-1)) and RCH134 (2107.4 kg ha(-1)). Statistically improved bolls per plant and boll weight primarily helped MRC7361 in achieving the highest yield. Owing to better fertilizer use efficiency (5.47) and water productivity (649.3 gm(-3)), highest net returns of < or = 101047 ha(-1) were observed with MRC7361 as compared to Bioseed 6488 (< or = 83343 ha(-1)) and RCH134 (< or = 63014 ha(-1)). Bolls per plant and benefit cost ratio was significantly enhanced under wider geometry of 67.5 x 90 cm. Application of 225 kg N, 45 kg P ha(-1) produced significantly higher SCY (2825.9 kg ha(-1)) owing to improved sympods and bolls per plant than 150 kg N, 30 kg P ha(-1) (2374.9 kg ha(-1)) and 187.5 kg N, 37.5 kg P ha(-1) (2677.6 kg ha(-1)). As a result of this, statistically highest net returns of < or = 89552 ha(-1) were obtained with application of 225 kg N, 45 kg Pha(-1). Water productivity improved significantly with each successive increase in the level of nutrients. Contrarily, fertilizer use efficiency exhibited reverse trend with statistically highest value (5.08) for the lowest level of nutrients.
authors.forename: Kulvir
authors.initials: K
authors.lastname: Singh
authors.forename: Pankaj
authors.initials: P
authors.lastname: Rathore
authors.forename: R K
authors.initials: RK
authors.lastname: Gumber
mesh_terms: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics; D018533:Biomass; D002678:Chimera; D018556:Crops, Agricultural / Q000191:economics* / Q000254:growth & development; D004731:Endotoxins / Q000235:genetics; D003368:Gossypium / Q000235:genetics / Q000254:growth & development*; D006460:Hemolysin Proteins / Q000235:genetics; D030821:Plants, Genetically Modified
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis