Effect of different of macro nutrients on growth and spike yield of Dendrobium orchid var. sonia red

Abstract

The present experiment was conducted to determine the “Effect of different of macro nutrients on growth and spike yield of dendrobium orchid Var. Sonia red” in the department of horticulture, Sam Higgingbottom institute of agriculture technology and sciences, Prayagraj, (U.P), India. During the winter season 2019. The potting media for the orchids has gravel, charcoal, brick pieces and coconut husk. These are filled in 8 inch earthen pots with 1 inch holes around. Ten different NPK ratios were taken as treatments and are applied as foliar spray at an interval of twice a week at 0.2% (i.e., by mixing 2gm of NPK in 1000ml of water).the 10 treatments included in the trail VIZ., T1 [control], T2 [19:19:19, NPK @ 0.2%], T3 [10:10:20,NPK @ 0.2%], T4 [30.:20:20, NPK @ 0.2%], T5 [20:20:20, NPK @ 0.2%], T6 [15:15:15, NPK @ 0.2%],T7 [20:10:20, NPK @ 0.2%], T8 [20:10:10, NPK @ 0.2%], T9 [10:30:30, NPK @ 0.2%], T10 [10:15:20, NPK @ 0.2%] were tested in three replications. The results revealed that macro nutrient treatment which had significant response on plant height (cm), leaf area, number of leaves per plant, number of new shoots, shoot girth, total number of shoots, total number of roots per plant, root length, number of spike yield per plant, number of florets per spike, spike length and longevity of flower spike on the plant.T5(20:20:20, NPK @ 0.2%) has recorded maximum performance in all the parameters as follows, plant height (39.81) cm leaf area (47.59 cm2), number of leaves (10.47), number of new shoots(5.76),shoot girth (4.93), total number of shoots (7.64),number of roots per plant (50.28),root length (22.35),number of spike yield per plant (2.00),number of florets per spike (5.48),spike length (28.30), longevity of flower spike on plant (44.43). The next succeeded performance was by T7 [20:10:20, NPK @ 0.2%]which showed performance just as much as T5[20:20:20, NPK @ 0.2%] and recorded as follows. plant height (37.87cm) leaf area (45.43 cm2), number of leaves (9.26),number of new shoots(4.86),shoot girth(4.43),total number of shoots(7.85),number of roots per plant (49.45),root length (21.83),number of spike yield per plant (1.46),number of florets per spike (5.34), spike length (37.63), longevity of flower spike on plant (42.31).