Effect of different levels of pruning along with npk on growth and yield of nerium (nerium oleander l.)

Vijai ananth. A and S.Rameshkumar

Field investigation was carried out at the floriculture complex in the Department of Horticulture, Faculty of Agriculture, Annamalai University, Annamalainagar, Tamil Nadu during the year 2010-2011 to study the effect of different levels of pruning along with NPK on growth and flowering of Nerium oleander. The experiment was laid out in Factorial Randomized Block Design with two factors, twelve treatments replicated thrice. The experiment was conducted by using three levels of pruning height viz., P1-60, P2-90 and P3-120cm along with three different levels of inorganic fertilizer viz., NPK @ 90:160:160g/plant, 120:240:240g/plant, 150:300:300g/plant and without inorganic fertilizer. Three year old plants of Nerium cv. ‘Pink Double’ already existing in the field planted at a spacing of 1m  1m was used for the present study. The healthy plants were pruned at a height of 60, 90 and 120 cm and the fertilizers were applied as per treatments. The observations on growth parameters viz., Plant height, number of branches, number of leaves, internodal length, fresh weight and dry weight and yield parameters viz., Days to first flowering, number of flowers, flower diameter, single flower weight, and flower yield were recorded. The study revealed that pruning at 90cm and NPK @ 120:240:240 g /plant increased the number of leaves, number of branches fresh weight dry weight and yield attributing characters.