Cálculo de Calagem

The main liming objectives are: eliminating soil acidity and provide calcium and magnesium supply for the plants.

LIME NEED OF CALCULATION

CN = (CTC x (V2 - V1)) / (10 x PRNT)

 Where: NC = lime requirement in tonnes per hectare (t / ha)

CTC = cation exchange capacity (soil analysis)

V1 = Current value of base saturation (soil analysis)

V2 = desired base saturation value (recommendation for culture)

PRNT = total neutralization of relative power (data on the package of limestone).

When the PRNT is not determined, it adopts the average value of 67%

Example: A soil analysis provided in the following amounts:

CTC = 83 mmol / dm and V = 23%.

The limestone to be used must PRNT = 76%.

The culture to be cultivated is maize which is recommended value of 70% saturation.

NC = (83 x (70 - 23) / 10 x 76) = approximately 5.1 / and 5 tons / ha

The calculation is simple app, comes to help automate this calculation.