Author(s):

Altaf Kuntoji, Subbarayappa CT, Sathish A, Ramamurthy V and Mallesha BC

Abstract: The expansion of urbanization and industrialization has an adverse effect on the physical, chemical and biological properties of soils there by availability of nutrients and crop growth are getting affected with this the objective was framed to study the effect of different levels of nitrogen and zinc on growth, yield and quality of maize. Two field experiments were carried out in rural and peri-urban of southern transect of Bengaluru during 2019. The experiment was laid out in factorial RCBD with three replications. Three levels of nitrogen (0, 150 and 200 kg ha^-1) were applied as urea, in combination with three levels of zinc (0, 2.1 and 4.2 kg ha^-1) were applied as zinc sulphate. Experimental data showed that growth, yield and quality parameters of maize were significantly affected by both N and Zn. The application of 200 kg N ha^-1 and 4.2 kg Zn ha^-1 recorded significantly higher plant height (213.64 and 207.21 cm), no of leaves plant^-1 (12.28 and 11.62), chlorophyll content (30.38 and 27.48 mg g^-1), no. of grains cob^-1 (638.86 and 604.60), grain weight cob^-1 (202.35 and 187.66 g), cob diameter (4.80 and 4.50 cm), cob length (20.30 and 19.91 cm), cob yield (82.16 and 78.11 q ha^-1), straw yield (104.28 and 97.17 q ha^-1), protein content (9.11 and 8.67%) and oil content (3.99 and 3.81%) at harvest in rural. Similarly, in peri-urban, higher plant height (195.98 and 199.95 cm), no of leaves plant^-1 (11.79 and 11.12), chlorophyll content (26.16 and 23.92 mg g^-1), no. of grains cob^-1 (622.59 and 590.69), grain weight cob^-1 (189.40 and 173.09 g), cob diameter (4.46 and 4.21 cm), cob length (19.50 and 18.60 cm), cob yield (78.71 and 73.60 q ha^-1), straw yield (97.11 and 89.04 q ha^-1), protein content (8.60 and 8.15%) and oil content (3.96 and 3.73%) at harvest were recorded significantly by the application of 200 kg N ha^-1 and 4.2 kg Zn ha^-1, respectively From the study, it was suggested that the combined application of 200 kg N ha^-1 and 4.2 kg Zn ha^-1 recorded to get better yield of maize.

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