Effect of Foliar Spray of Nitrogen and NAA on Growth and Yield Traits of Cowpea (Vigna unguiculata L.)

Abstract

A field experiment was conducted during Kharif (wet) season 2021 at experimental field of the Crop Research Farm, SHUATS, Praygraj, Uttar Pradesh, India. The experiment was laid out in randomized block design with twelve treatments replicated thrice on the basis of one year experimentation on sandy loam soil. To determine the “Effect of foliar application of nitrogen and NAA on growth and yield of cowpea (Vigna Unguiculata L.). The treatments consisted of three levels of Urea spray – 1.0 %, 1.5% and 2.0% and Four levels of Plant growth regulator [NAA] spray – 0ppm, 25 ppm, 50 ppm and 75 ppm. The Treatments were applied as Foliar spray after 20 and 40 days after sowing. The results showed that treatment with the application of Nitrogen (Urea) 2.0% + NAA at 25 ppm recorded significantly higher plant height (53.80 cm), number of branches (7.27), dry weight (39.10 g/plant), However, Maximum number of pods plant-1 (16.93), number of seeds pod-1 (14.33), pod dry weight (4.17 g), Seed index (18.42 g), seed yield (1436.26 kg ha-1) and haulm yield (2651.97kg ha-1) were also recorded in the same treatment with the application of Nitrogen 2.0% + NAA at 25 ppm.