COVER CROPS in South African Vineyards
trol
COVER CROPS IN SOUTH AFRICAN VINEYARDS
rol
3000
2500
2000
1500
1000
500 Nitrogen in milligram per kilogram
0
Sown Sown 1995 Sown Sown two- Mechanical control annually annually yearly
Chemical
Slashed
control
Grazing vetch
Oats
No cover crop
Dwarf fescue
FIGURE 8.18. Average nitrogen measured as nitrates in the leaf petioles of grapevines from 1995 to 1999 in cover-crop treatments compared to a control in the Lower Orange River region. Box indicates acceptable range. Fourie, unpublished data.
JOHAN FOURIE
157
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