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Table 4 Predictive regression equations and physical and economical optimal doses of N and K under different agro-climatic conditions

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

Experimental site

Plant nutrient

Regression equation

Physical optima (kg ha −1 )

Economical optima (kg ha −1 )

CSIR-IHBT

Nitrogen

y = 0.795 + 0.0192*x − 0.00009*x2

106.67

106.16

Potassium

y = 0.89 + 0.0358*x − 0.0004* x2

44.62

44.43

RHRS

Nitrogen

y = 0.705+ 0.005*x − 0.000006* x2

-

-

Potassium

y = 0.665 + 0.0159*x − 0.0002* x2

39.75

39.37

PAU

Nitrogen

y = 0.17+ 0.0134*x − 0.00009* x2

74.44

73.93

Potassium

y = 0.55 + 0.0036*x − 0.00004* x2

45.00

43.08

  1. *mark indicates that the corresponding values are significant at P = 0.05 . The physical and economical optima of N for RHRS were not calculated since the relation between N and dry leaf yield (t ha−1) was almost linear.
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BMC Plant Biology

ISSN: 1471-2229

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