Journal of FARM SCIENCES, Vol 25, No 1 (2012)

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Effect of nitrogen, phosphorus and potassium levels on growth and yield of stevia (Stevia rebaudiana Bertoni.)

Y.R. Aladakatti, Y.B. Palled, M.B. Chetti, S.I. Halikatti, S.C. Alagundagi, P.L. Patil, V.C. Patil, A.D. Janawade

Abstract


A field experiment was conducted in medium black, clayey soil under irrigated conditions to assess the response of stevia to levels of nitrogen, phosphorus and potassium. Five cuttings (crops) were taken in a year. Pooled results indicated that significantly higher dry leaf yield was obtained with nitrogen @ 400 kg ha-1 (11.42 t ha-1 ) and it was on par with 300 kg ha-1 (10.94 t ha-1 ). Phosphorus @ 200 kg ha-1  recorded significantly highest dry leaf yield (11.14 t ha-1 ) and it was on par with 150 kg ha-1  (10.85 t ha-1).  Potassium @ 200 kg ha-1  recorded  dry leaf yield of 10.78 t ha-1  and it was comparable with potassium @100 kg ha-1  (10.46 t ha-1 ). The growth parameters viz., plant height, number of branches plant-1 and number of leaves plant-1 were significantly higher with nitrogen, phosphorus and potassium @ 400 kg ha-1,  200 kg ha-1  and   200 kg ha-1, respectively which were on par with 300 kg ha-1, 150 kg ha-1  and 100 kg ha-1  respectively. In pooled data nitrogen @ 400 kg ha-1  (N2) recorded the highest B:C (3.01) which was on par with nitrogen @ N2 i.e., 300 kg ha-1  (2.93), but significantly higher than N1 i.e., 200 kg ha-1  (2.66).  Phosphorous P3 i.e., 200 kg ha-1 resulted in higher B:C (2.96) which was on par with P2 i.e., 150 kg ha-1  (2.91). Potassium level influenced the B:C non-significantly. Significantly lowest B:C  were recorded with absolute control in pooled data (2.14). Interactions of N, P and K were non-significant. Nutrient level of 300:150:100 kg ha-1  NPK applied in equal splits to five cuttings (Crops) in year has been considered as an economically optimum level of nutrients for stevia.

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