SSNM-based rationale of fertilizer use in perennial crops : A review
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Authors
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A K SRIVASTAVA
National Research Centre for Citrus, Nagpur , Maharashtra 440 010
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S N DAS
Maharashtra Remote Sensing Applications Centre, Nagpur, Maharashtra
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S K MALHOTRA
ICAR, New Delhi
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KAUSHIK MAJUMDAR
International Plant Nutrition Institute (IPNI), Gurgaon, Haryana
Keywords:
Fertilizer requirement, GPS-based grid sampling, Perennial crops, Soil spatial variability, SSNM, Sustainable production, Variable rate fertilizer applicationAbstract
Behaviour of crops and soils due to non-redressal of spatial variability in soil properties is not expressed uniformly within bigger orchard/field which has been the major triggering factor for not able to break yield barrier through conventional nutrient management strategy. Better response of site specific nutrient management (SSNM) over recommended doses of fertilizers (RDF) including those of farmers’ usual fertilizer practices (FFP) signals a wake-up call to address the fertilizer requirements on the principles of SSNM, if the full potential productivity of perennial crops has to be realized and sustain on any given soil type. The SSNM also warrants to tailor the fertilizer application on the basis of spatial variation in soil fertility and tree canopy size within an orchard/field through variable rate fertilizer application to minimize the gap between actual and potential productivity of crops. Application of geospatial tools like GPS and GIS coupled with DRIS- based nutrient diagnostics has substantially aided in developing rationale of fertilizer use using SSNM concept in crops like citrus, avocado, coconut, olive etc. which could well be expanded to other perennial crops.
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