Crop-ecology and nutritional variability influence growth and secondary metabolites of Stevia rebaudiana Bertoni

Table 6 Effect of applied N P and K on soil pH, organic carbon (OC), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) at CSIR-IHBT

Treatment	pH		OC (%)		AN (kg ha ⁻¹ )		AP (kg ha ⁻¹ )		AK (kg ha ⁻¹ )
Treatment	2010	2011	2010	2011	2010	2011	2010	2011	2010	2011
Nitrogen Level
N₃₀	6.59	5.88	2.41	2.15	222.83	327.88	62.51	59.42	549.55	486.38
N₆₀	6.35	5.85	2.40	2.02	212.72	319.35	67.65	55.12	557.75	494.15
N₉₀	6.26	5.83	2.57	2.20	205.06	310.11	64.67	66.34	544.66	504.70
SEm(±)	0.08	0.04	0.12	0.10	7.87	12.08	4.33	7.42	10.02	19.85
CD(P = 0.05)	0.22	NS	NS	NS	NS	NS	NS	NS	NS	NS
Phosphorus Level
P₂₀	6.42	5.86	2.5	2.07	210.57	326.84	65.08	61.33	540.33	495.35
P₄₀	6.39	5.85	2.43	2.18	216.50	311.39	64.81	59.26	560.98	494.81
SEm (±)	0.06	0.03	0.10	0.08	6.43	9.86	3.53	6.06	8.18	16.20
CD(P = 0.05)	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Potassium Level
K₂₀	6.47	5.86	2.56	2.01	215.69	327.01	67.13	52.07	548.45	478.68
K₄₀	6.42	5.82	2.37	2.25	208.89	314.29	57.99	67.85	559.35	503.53
K₆₀	6.33	5.89	2.46	2.11	216.03	316.03	69.7	60.96	544.17	503.02
SEm (±)	0.08	0.04	0.12	0.10	7.87	12.08	4.33	7.42	10.02	19.85
CD(P = 0.05)	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Interaction effect
CD of N × P	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
CD of N × K	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
CD of P × K	0.31	NS	NS	0.47	NS	49.08	NS	NS	NS	NS
CD of N × P × K	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS

N₁, N₂ and N₃ are the level of nitrogen @ 30, 60 and 90 kg ha⁻¹, respectively. P₁ and P₂ are the level of phosphorus (P₂O₅) @ 20 and 40 kg ha⁻¹, respectively, while K₁, K₂ and K₃ are representing the level of potassium (K₂O) @ 20, 40 and 60 kg ha⁻¹, respectively.

ISSN: 1471-2229