Modelling the Effects of Soil Conditions on Olive Productivity in Mediterranean Hilly Areas

Table 1

Analytical methods used to determine soil physical and chemical properties.

Element	Method and analysis equipment	Reference
Soil bulk density	Undisturbed clod method	Blake (1965) [24]
Soil organic matter	Walkley-Black method	Walkley and Black (1934) [25]
Nitrogen	Kjeldahl wet digestion	Bremner and Mulvaney (1982) [26]
Available phosphorus	Olsen colorimetry	Olsen and Sommers (1982) [27]
Extractable potassium	Extractable potassium, Flame Photometer 409	Richards (1954) [28]
Extractable boron	Spectrocolorimetry	Bingham (1982) [29]
Iron, copper	DTPA test. Atomic Absorption Spectrometry	Lindsay and Norvell (1978) [30]