Response of different levels of NPK on growth, flowering and yield of tuberose (Polianthes tuberosa L.) cv. Shringar

The experiment was conducted at the Department of Horticulture, Sam Higginbottom Institute of Agriculture Technology & Sciences, Allahabad, (U.P.) during the period from March to October (2012) to investigate the response of different levels of NPK on growth, flowering and yield of tuberose (Polianthes tuberosa L.) cv. Shringar. 12 treatments were included in the trial viz; T0 (Control), T1 (20:40:20), T2 (40:80:40), T3 (60:120:60), T4 (80:160:80), T5 (100:200:100), T6 (120:240:120), T7 (140:280:140), T8 (160:320:160), T9 (180:360:180), T10 (200:400:200) and T11 (220:440:220) N,P,K kg/ha were tested in three replication. The experiment of design was randomized block design. The results reveal that fertilizer treatments had significant response on all parameters. The maximum number of leaves/plant (33.73), number of tillers/clump (3.52), number of spike/clump (5.56), yield of spike/ha (749.98), diameter of largest bulb (5.47 cm), number of bulbs/clump (17.83 g), weight of larger bulb (82.96 g), diameter of largest bulb (5.47 cm) were produced by the treatment (T9) of N:P:K in a ratio of 180:360:180 kg/ha. It was the best treatment for good vegetative as well as reproductive growth. Application of N, P2O5 and K2O at 180:360:180 kg/ha may be applied.