RESPONSE OF PHAIUS TANKERVILLEAE BL. AND SPATHOGLOTTIS PLICATA BL. TO VARIOUS NUTRIENT CONCENTRATION LEVELS
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Date
2021
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Abstract
An experiment was conducted in the Experimental Farm, Department of
Horticulture, Assam Agricultural University, Jorhat during 2019-2021, to study on
“Response of Phaius tankervilleae Bl. and Spathoglottis plicata Bl. to various nutrient
concentration levels.”. The experiment was laid out in Randomized Block Design with
seven treatments replicated thrice. The treatments were T1 (RDF+Zn (500ppm), T2
(RDF+Zn (750ppm), T3 (RDF+Zn (1000ppm), T4 (RDF+Ca (250ppm), T5 (RDF+Ca
(500ppm), T6 (RDF+Ca (750ppm), T7 (Control:RDF 19 All).
The results revealed that all the growth characters were significantly
influenced by mineral nutrients. Amongst the treatments, T5 (RDF+Ca (500ppm), was the
best for increasing all the growth characters for both the species viz., plant height
(56.27cm, 54.37cm), number of leaves (12.33,10.33), leaf length (53.07cm,62.1cm), leaf
width (9.67cm,7.80cm), leaf area (469.23cm2, 440.70cm2), stem diameter (7.07cm,
5.97cm) and number of pseudobulbs (2.80, 2.57). Treatment T2 (RDF+Zn (750ppm)
exhibited minimum days for inflorescence visibility (50.87,203.13), bud development
(142.80,259.20), days to half bloom (146.30,264.03) and days to full bloom
(148.77,267.13) as well as highest value for spike length (66.73cm, 104.67cm), floret
diameter (9.67cm,5.37cm), stalk girth (3.67cm, 1.63 cm), number of florets per spike
(12.93, 11), number of spikes per plant (2.50, 3.90), self life (17.80, 15.33), vase life
(10.43, 9.20), fresh weight at harvest (61.67g, 10.80g) and fresh weight at senescence
(22.80g, 5.47g). Regarding the physiological characters T2 (RDF+Zn (750ppm) was best
for increasing total chlorophyll content (1.55mg g-1fw, 1.52mg g-1fw), stomatal number
(37.13, 42.09) and stomatal size (5.80 μm2 and 5.73μm2). For soil characters for both the
speciesno significant changes were observed in case of soil pH and the available N
content, however the available P and K were found highest in T5 (RDF+Ca (500ppm).
Evaluation from the economics of cultivation, it can be concluded that the
highest benefit cost ratio of 6.74 for Phaius tankervilleae Bl. was obtained in T2
(RDF+Zn (750ppm) and for Spathoglottis plicata Bl. the highest benefit cost ratio of
5.51 was recorded in T2 (RDF+Zn (750ppm).