WINETECH Technical Yearbook 2021

FIGURE 6. Indicates the varying correction of potassium.

application amounts than the one-arrow approach in the fertilisation programme, while areas with high potassium and magnesium values should receive no additional applications of these elements. As indicated in figures 7 and 8, Vinpro developed an adjusted interpolation system from experience and historical data which is unique to the wine industry. The concept originated because blocks are regularly replaced with other blocks and lime adjustments are then only performed on the new blocks before soil preparation. This implies that there are certain blocks that have been recently corrected with precision farming principles, alongside blocks that

figures 3 and 5, magnesium and potassium are already low in the overlimed areas. To generate these distribution maps, representative soil samples must be taken within blocks on a distribution pattern; the more soil samples, the more variation can be captured, which then improves the accuracy of the varying correction maps (figures 4 and 6). A soil map or NDVI images can also more accurately determine the positions where soil samples should be taken. For example, areas that have been analysed as having low potassium or magnesium (figures 3 and 5), must receive higher

FIGURES 7 and 8. Traditional interpolation versus Vinpro’s unique, adjusted approach.

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