Mapping of Maize Growing Period over the Free State Province of South Africa: Heat Units Approach

Table 1

Equations and values for the regression between 50% nonexceedence probability of growing period against altitude in the Free State for short (S), medium (M), and medium-late (ML) season varieties.

Planting dekad	Variety	Regression equation
October 1st dekad	S		0.85
	M		0.85
	ML		0.84
October 2nd dekad	S		0.85
	M		0.86
	ML		0.85
October 3rd dekad	S		0.85
	M		0.86
	ML		0.86
November 1st dekad	S		0.83
	M		0.86
	ML		0.84
November 2nd dekad	S		0.81
	M		0.84
	ML		0.73
November 3rd dekad	S		0.83
	M		0.75
	ML		0.79
December 1st dekad	S		0.78
	M		0.82
	ML		0.82
December 2nd dekad	S		0.82
	M		0.82
	ML		0.82
December 3rd dekad	S		0.83
	M		0.73
	ML		0.68
January 1st dekad	S		0.70
	M		0.75
	ML		0.67