WINETECH Technical Yearbook 2019

PHOTO 6. Example of area where samples should be taken – between the grapevines, away from the dripper.

PHOTO 7. Example of active roots within the sampling zone.

PHOTO 5. Control the cultivation depth after soil preparation.

PHOTO 4. Control after soil preparation.

• Take samples on either side of the row and mix to constitute one representative sample (Photos 12 and 13). Place 1 kg samples in clean plastic bags and mark clearly. Most of the local laboratories provide bags for sampling.

• It is important that the soil sample should be representative of the area being sampled. • In uniform growth areas one composite sample per management unit may be taken (Photo 16). The sample should be

composed of five subsamples taken at different spots in the block. • When problem spots occur in a block, at least two soil samples should be taken; one in the problem area and one in the healthy area (Photo 17). The reason for

this being that the potential differences in the results of the analysis will clearly show what could possibly be the problem in terms of nutritional analyses. • Grid sampling (Photo 18) is currently being offered by various instances.