Studies On Different Fertilizer Recommendation Approaches For Irrigated Wheat Triticum aestivum L In a Vertisol Under Northern Transitional Zone of Karnataka

Abstract

The field experiments were conducted at the research farm of All India Co-ordinated newlineWheat and Barley Improvement Project (AICWandBIP), Main Agriculture Research Station, newlineUniversity of Agriculture Sciences, Dharwad during rabi 2020-21 and 2021-22 to assess the newlineproductivity, quality, uptake and use efficiency of nutrients by wheat crop and residual newlinenutrient status in soil through different nutrients management practices. The treatments newlineconsisted of different fertilizer recommendation approaches namely Site Specific Nutrient newlineManagement (SSNM) and Soil Test Crop Response (STCR) for targeted yields at 40, 45, 50 newlineand 55 qha-1, Nutrient Expert (NE) targeted yield at 40 qha-1 and Soil Test Laboratory (STL) newlineapproach and these were compared with graded levels of fertilizer application (125 and 150% newlineRecommended Dose of Fertilizer) and Recommended Package of Practice (RPP). The field newlineexperiment was laidout in randomized completely block design (RCBD) with 15 treatments newlinereplicated thrice. newlineThe growth, yield and quality of wheat were significantly influenced by the different newlinenutrient management approaches. The yield target at 50 qha-1 under SSNM practice newlinesignificantly increased number of effective tillers (276.8 m-2), number of grains panicle-1 newline(40.2), grain weight panicle-1(1.86 g), test weight (45.2 g) and grain yield (50.5 qha-1) in newlinewheat and it was on par with yield targets at 55 and 45 qha-1 under the same practice. Further, newlinethe same treatment recorded significantly higher protein (13.29%) and wet gluten (34.3%) newlinecontents, sedimentation value (44.7 ml) and yellow pigment (5.78 ppm) with higher total newlineuptake (grain+straw) of NPK and S (187.0, 36.1, 96.2 and 38.4 kgha-1, respectively) and Cu, newlineFe, Mn and Zn (225.6, 1820, 964 and 352 g ha-1, respectively) by wheat crop at the time of newlineharvest. newlineThe significantly higher nutrient use efficiency of nitrogen (63.86%), phosphorus newline(87.17%), potassium (87.78%) and sulphur (680.94%) by wheat was recorded in Nutrient newlineExpert yield target at 40 qha-1, STCR yield target at 50 qha-1, STL approac