Impact of growth regulators on fruit drop and yield parameters of sweet orange (Citrus sinensis Osbeck) cv. Jaffa

The present investigation was carried out at Research Orchard of Department of Horticulture, Chaudhary Charan Singh Haryana Agricultural University, Hisar, during the year 2015-16 to study the effect of growth regulators on fruit drop, yield and quality of sweet orange (Citrus sinensis Osbeck.) cv. Jaffa. The Hormones such as GA3, 2,4-D and NAA in different concentrations was sprayed twice, i.e., in last week of March and first week of July. The results revealed that maximum reduction of fruit drop from May to harvesting and percent fruit retention was recorded with the treatment NAA 20 ppm. The fruit yield parameters, i.e., number of fruits per plant and fruit yield per plant, were obtained highest with NAA 20 ppm, while the other parameters like fruit weight and fruit size, length were recorded highest with foliar application of GA3 30 ppm. Where all hormonal treatments shown significantly better performance than control respectively.