GROWTH, YIELD AND QUALITY OF ROSE (Rosa hybrida) AS INFLUENCED BY FERTILIZER DOSES UNDER POLYHOUSE
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Date
2023
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An experiment was carried out during the period of 2022-23 to study the effect of different NPK fertilizer doses on growth, yield and quality of rose in the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat. The experiment was laid out in Factorial Randomized Block Design with three levels of nutrients i.e N,P,K.. Each of these has three levels N(N1,N2,N3) where N1(10 g N/m²),N2(20 g N/m²) and N3(30 g N/m²).Similarly, P has three levels where P1(10 g P2O5/m²),P2(20 g P2O5/m²) and P3(30 g P2O5/m²).Again K has three levels where K1(10 g K2O/m²),K2(20 g K2O/m²) and K3(30 g K2O/m²) which replicated three times. Planting of the grafted plants were done in the month of May,2022.The results revealed that, among the N levels, N2 recorded highest plant height(44.53 cm,63.86 cm and 84.99cm), highest number of leaves per plant (69.53,111.74,152.65),maximum leaf area(37.68,43.66,45.46 cm²),plant spread(24.82 cm,28.18cm,31.16 cm) in 60 DAP, 90 DAP and 120 DAP. Among the different phosphorus levels P1 recorded highest plant height (43.65 cm,64.42 cm and 85.58 cm),number of leaves per plant(68.01,110.09,148.54),plant spread (23.76 cm,27.70cm and 30.93 cm) in 60 DAP,90 DAP and 120 DAP. Again among the different K levels,K2 recorded highest plant height of (63.01 cm, 84.29 cm) in 90 DAP and 120 DAP.K2 recorded highest plant spread (23.71 cm and 28.03 cm) in 60 DAP and 90 DAP. Among the different flower characters,N2 recorded highest bud length(3 cm),stalk length(30.34 cm),flower diameter(6.61 cm),number of flowers per plant (10.63)and vase life(9.43).Among the P levels,P1 recorded highest stalk length (29.80 cm),highest flower diameter(6.49 cm) and number of flowers (10.24).Among the different K levels,K3 recorded maximum stalk length(29.44 cm) and number of flowers(10.36).Among the physiological parameters, N2 recorded highest chlorophyll content and again P2 and K2 recorded highest chlorophyll content both before and after flowering. Leaf nitrogen was found highest in N3,P1 and K2 before and after flowering. Leaf phosphorus was found maximum in N2,P1,K2 before and after flowering. Soil nitrogen was found highest in N3,P3 and K1 ,Soil phosphorus was found maximum in N3,P3 and K1 and Soil potassium was found highest in N1,P2 and K3 level before flowering and in N1,P3,K3 after flowering.Among the interaction treatments,N2P1K3(T12) showed best results in terms of most of the growth and flower characters.The treatment N2P1K3 was found to be best with highest bud diameter (3.15 cm),stalk length(33.69 cm),numbers of flowers per plant per month (14) and minimum days to full bloom(57.33 days) and B:C ratio of 3.98.