Studies on the influence of plant growth regulators and their time of application on growth and tuber yield of sweet potato (Ipomoea batatas L.) cv. Kiran under southern Telangana conditions

Abstract

A field experiment was conducted at College of Horticulture, Mojerla during Rabi 2016-17 to study the influence of plant growth regulators and their time of application on growth and tuber yield of sweet potato Cv. Kiran. The treatment comprised six plant growth regulators viz... Cycocel, Paclobutrazole, ALAR, Salicylic acid, Gibberellic acid and Ethrel each with two different concentrations and control (water) were used as foliar spray at 30 and 45 days after planting. Experiment was carried out under factorial randomized block design (FRDB) with two replications. The result revealed that, among different plant growth regulator treatments, GA3 200 ppm registered higher vine length, more number of leaves per branch, bigger leaf area, more fresh weight & dry weight of branches per vine and higher fresh weight and dry weight of leaves per vine, whereas maximum number of branches per vine was recorded in CCC 500 ppm. All treatments differed significantly with respect of tuber parameters, CCC 500 ppm recorded highest tuber yield per hectare (40.06 t) and maximum harvest index were (49.17 %).