Sampling protocol for soil analysis

The procedure for the sampling was established by Juan Palo del Monte, professor of the UPM.

- Number of samples: 1 sample per 5 ha.

- Deep of the sampling:

• 0-10 cm
• 10-20 cm

- Labelling and storage:

• Plastic bags and boxes for each individual sample
• Label inside de plastic bag and written: deep of sampling, name of the plot, point number

- Location of the sampling points with GPS

- For each organic crop an control sample was taking equivalent with it, but in conventional