Impact of different methods and levels of nano urea and nano DAP application on soil chemical properties and fertility status in maize (Zea mays)

Abstract

The study evaluates the impact of different methods and levels of nano urea and nano DAP application on soil chemical properties and fertility status in maize (Zea mays). A field experiment was conducted at the Agronomy Field Unit, Zonal Agricultural Research Station, University of Agricultural Sciences, Bengaluru, during the kharif season 2022. The experiment followed a split-split plot design with two application methods (soil and foliar), three levels of nano urea (2, 4, and 6 ml L-1), and three levels of nano DAP (2, 4, and 6 ml L-1), replicated thrice. The results showed that foliar application significantly improved maize grain yield (8239 kg ha-1) compared to soil application (7784 kg ha-1). Among the fertilizer levels, the highest grain yield was observed with nano urea @ 6 ml L-1 (8177 kg ha-1) and nano DAP @ 6 ml L-1 (8162 kg ha-1). However, the study found no significant impact of nano fertilizers on soil pH, electrical conductivity, organic carbon, and micronutrient availability, indicating that nano fertilizers, when applied in small quantities, do not alter soil chemical properties. This research underscores the potential of nano fertilizers to enhance maize productivity without negatively affecting soil fertility, thereby promoting sustainable agricultural practices.