Effect of Potassium and Gibberellic Acid on the Growth and Yield of Cowpea (Vigna unguiculata L.)

The field experiment was conducted at experimental field of the Crop Research Farm, Department of Agronomy, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, Uttar Pradesh, India. The soil of experimental field is Sandy loam in texture, nearly neutral in soil reaction (pH 7.1), low in organic carbon (0.36%) available N (171.48 kg/ha), available P (27.0 kg/ha) and K (291.2 kg/ha). The Experiment was laid out in Randomized Block Design with nine treatments and one control plot replicated thrice on the basis of one year experimentation. To determine the Effect of Potassium and Gibberellic Acid on the growth and yield of Cowpea (Vigna unguiculata L.). The treatments consisted of three levels of Potassium – 20 kg/ha, 25 kg/ha and 30 kg/ha and three levels of Gibberellic acid spray – 100 ppm, 120 ppm and 150 ppm. The results showed that treatment with the application of Potassium – 30 kg/ha + GA3 - 100 ppm was recorded significantly higher Plant height (68.8 cm), no. of nodules/plant (40.9), dry weight (39.32 g). Whereas, maximum Number of pods per plant (16.94), seeds per pod (13.46), seed index (18.36 g), higher seed yield (1459.70 kg/ha) and Haulm yield (2952.30 kg/ha).