Agriculture Reference
In-Depth Information
Organic Viticulture
Material
Function
Comments
Rock phosphate,
phosphatic guano
Supplies P, Ca
Slowrelease;mustbeappliedtosoilofpH<6
(water) or 5.5 (CaCl
2
) and be finely ground
to be effective; small liming effect
Elemental S
Supplies S
Wettable powder used for control of powdery
mildew
Wood ash
Supplies K, Ca, and
Mg
Timber must not have been chemically treated
Rock dust
SuppliesCa,Mg,
some K, and
micronutrients
Veryslowrelease;mustbeinelyground
Rock potash and
sulfate potash
(K
2
SO
4
)
Supplies K, S
Minedproduct
Epsomsalts(MgSO
4
)
SuppliesMg,S
Natural product
Lime (CaCO
3
)
Raises soil pH,
supplies Ca
See box 3.6 for specifications
Gypsum
(CaSO
4
.2H
2
O)
Improves soil
structure,
supplies Ca
Mustbefromanaturalsource
Dolomite(Ca,Mg)
CO
3
Raises soil pH,
suppliesCa,Mg
See box 3.6 for specifications
Compiled from Goldspink and Howes (2001) and the National Standard for Organic and Biodynamic
Produce (2009).
Standard Analysis
MIR
Figure 3.16
Good agreement
shown between maps of soil
calcium carbonate (CaCO
3
)
content (5 to 15-cm depth) in a
small Coonawarra vineyard, either
measured by a standard method
or predicted from midinfrared
diffuse reflectance. The latter was
calibrated using a data set derived
from the analysis of a large number
of Australian soils. (Courtesy
of Dr. Robert Bramley, CSIRO
Ecosystem Sciences, Adelaide,
South Australia.)
Carbonate (%)
< 3
3 - 6
6 - 9
9 - 12
12 - 15
15 - 18
18 - 21
> 21
N
W
E
S
050 100 150 200 Metres
