Author(s):

Mohanapriya G, Gopalakrishnan M, Santhi R, Maragatham S and Sritharan N

Abstract: A field experiment was conducted on red non-calcareous, sandy loam soil belonging to Palaviduthi soil series (Typic Rhodustalf) during rabi 2019 to generate fertilizer prescription equations (FPEs) for targeted yield of hybrid maize under drip fertigation. The experiment comprised of eleven treatments viz., STCR – NPK alone and STCR –IPNS for yield targets 8, 9, 10 t ha^-1, blanket with and without FYM (12.5 t ha^-1), FYM alone @ 6.25 and 12.5 t ha^-1 and absolute control in randomised block design with three replications. From the experimental data, basic parameters viz., nutrient requirement (NR), contribution from soil (Cs), contribution from fertilizers (Cf) and contribution from FYM (Cfym) were computed. It has been found that the nutrient requirement for producing one quintal grain of maize was 1.65 kg of N, 0.68 kg of P₂O₅ and 1.41 kg of K₂O. The per cent contribution from soil (Cs) was 35.73, 41.85 and 19.29 for N, P and K respectively and the percent contribution from fertilizer (Cf) and FYM (Cfym) was 52.33 and 35.62 for N, 44.50 and 27.64 for P₂O₅ and 88.87 and 45.32 for K₂O. Using these basic parameters, FPEs were developed through soil test crop response based integrated plant nutrition system (STCR – IPNS) for maize under drip fertigation. Thus developed FPEs were used for formulating monograms for a range of soil test values with desired yield targets.

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