Optimizing sunflower (Helianthus annuus) nutrition in acidic soils: Examining the effects of different doses of conventional and nano form nutrients on concentration, uptake and use efficiency
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Authors
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Rohitha D S
Sri S. Kariappa college of agriculture (University of Agricultural Sciences, Bengaluru), Kanakapura, Karnataka 562 117, India
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Mamatha B
University of Agricultural Sciences, Bengaluru, Karnataka 560 065, India
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Srinivas Reddy K M
College of sericulture (University of Agricultural Sciences, Bengaluru), Chintamani, Karnataka 563 125, India
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Sathish A
University of Agricultural Sciences, Bengaluru, Karnataka 560 065, India
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Channakeshava S
University of Agricultural Sciences, Bengaluru, Karnataka 560 065, India
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Lalitha B S
University of Agricultural Sciences, Bengaluru, Karnataka 560 065, India
Keywords:
Acidic Soil, Efficiency, Nano-fertilizer, Nutrients Concentration, Sunflower, UptakeAbstract
A two-season field experiment was conducted during the Kharif season in 2021 and 2022 at zonal agricultural research station, GKVK, Bengaluru. The soil was sandy loam (Alfisol) in texture, characterised by low pH levels, typical of acidic environments (pH 5.7) that often limit nutrient availability and the experiment was laid out in a randomised block design with three replications and comprised of 14 treatments, including varying combinations of recommended doses and Nano- Fertiliser. Results revealed that nitrogen, sulphur and zinc concentrations in sunflower (Helianthus annuus L.) varied significantly with application of treatment T14 (75% RDN + Nano Urea @ 4 ml/l + 25% ZnSO4 + Nano Sulphur @ 200 ppm+ Nano Zinc @500 ppm) compared to treatment T2 (Package of practice (FYM + Bio fertilisers + NPK + Zn + B)), while phosphorus and potassium were not significant. A similar kind of trend was observed in case of uptake of nitrogen, sulphur and zinc and this treatment recorded a significant improvement over other treatment. Furthermore, these findings underscore the potential for integrated use of conventional and nano formulations at optimal level to boost crop productivity without excessive inputs. Nutrients use efficiency of (72.01 kg/kg), phosphorus (26.47 kg/kg) and potassium (35.29 kg/kg) were influenced considerably with application of different levels of conventional and nano fertilisers among different treatment combinations.
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