Effect of nano urea and nano dap conjugated with potassium on physical and chemical properties of soil, growth and yield of okra crop (Abelmoschus esculentus L.) var. Sudha

Abstract

A field experiment was conducted to evaluate the physical and chemical properties of soil in department of Soil Science and Agricultural Chemistry, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj (UP). In the Randomized Block Design experiment, three levels of nano urea (0%, 50%, and 100%) and three levels of nano DAP (0%, 50%, and 100%) conjugated with potassium (recommended dose 100%) were employed. The results showed that the application of Nano urea and Nano DAP Conjugated with Potassium significantly enhanced the soil properties, growth, and yield of okra. The highest growth and yield were recorded by T9 [100% Nano Urea @ 1.23 l ha-1+ 100% Nano DAP @ 1.23 l ha-1 + K RD@ 83.3 kg ha-1], which was followed by T8 [100% Nano Urea @ 1.23 l ha-1 + 50% Nano DAP @ 0.615 l ha-1 + K RD@ 83.3 kg ha-1]. The lowest growth and yield were recorded by T1 [0% Nano Urea @ 0 l ha-1 + 0% Nano DAP @ 0 l ha-1 + K RD @ 83.3 kg ha-1]. In addition to Nano urea and Nano DAP conjugated with potassium increased percentage pore space (48.59%), water holding capacity (45.99%), electrical conductivity (0.36 dS m-1), and available nitrogen (284.16 Kg ha-1), phosphorus (34.63 Kg ha-1), and potassium (256.03 Kg ha-1) and decrease in bulk density (1.29 Mg m-3), Partical density (2.40 Mg m-3), soil pH (7.47). The highest benefit cost ratio (1: 6.195), and net profit (212,266.60) and found highest yield 112.5 q ha-1 on the T9.