Background: Supplement of balanced nutrition is required for the growth and development of crops and humans, particularly essential amino acids, vitamins and minerals. The application of mineral micronutrient fertilizers to soil or plant leaves to increase micronutrient content in edible parts of crop. Therefore, this study is focused to evaluate the effect of agronomic biofortification with different nutrient levels on maize. Methods: A field experiment was conducted on sandy clayey loam soil during the Rabi season of 2020-21 Perambalur, Tamil Nadu to study the effect of agronomic biofortification through integrated nutrient management for improving maize (Zea mays L.) yield and quality under Cauvery delta condition. Two hybrids in main-plots both, QPM and non-QPM were sown by direct method on ridges at a spacing of 60 x 20 cm under split plot design (SPD) with 6 treatments of nutrient management in sub-plot combination under three replications. Result: The results revealed that the nutrient level treatments containing 50% RDF through NPK + 50% RDF through FYM with Fe and Zn as foliar application @0.5% conc led to highest growth and yield attributes, grain yield (8.52 tha-1) and stover yield (10.35 tha-1) and also resulted in maximum crude protein content (14.93%), starch content (63.85 mg g-1), Fe (36.25 mg kg-1) and Zn (29.35 mg kg-1) in maize grain. It was observed that Agronomic biofortification through integrated nutrient management enhanced the vegetative growth and yield components of non-QPM hybrid, whereas it improved the grain quality content of the QPM hybrid.
The field experiments were conducted to evaluate combination of inorganic fertilizers along with organic manures at the Experimental Farm, Department of Agronomy, Annamalai University, Tamil Nadu. The treatments were tested in Split-plot Design and replicated thrice. It was observed that the growth and yield attributes of rice crop viz., plant height, no. of tillers hill -1 , LAI and dry matter production were favourably influenced by combined application of inorganic fertilizers and organic manures. The effect of application of 125% NPK + Vermicompost @ 5 t ha -1 + Azophos @ 25 kg ha -1 + Azolla @ 10 kg ha -1 + Foliar application of Sea weed extract @ 0.2 % at 15 and 30 DAT influenced the growth of rice and recorded highest in all aspects plant height, no. of tillers hill -1 , LAI and DMP which was on par with the application of 125% NPK + Vermicompost 5 t ha -1 + Azophos @ 25 kg ha -1 + Azolla @ 10 kg ha -1 .
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