To prevent the introduction of the moth, it is recommended that plants and branches should be free from soil, originate from a pest-free area or be fumigated or be imported during winter.
According to the regulations recommended by OEPP/EPPO ([1994]), such materials should be free from soil, come from pest-free areas, be produced in protected buildings or fumigated, or be imported during winter.
After 20 years of integrative watershed management, the area of the watershed that is free from soil erosion is up to 12.21 km2, which is 81.4% of the whole area.
Following shade drying, the plant material was manually made free from soil and other adulterants and was ground to coarse powder by an electrically driven mill.
Plant samples were transported back to the field laboratory, roots washed free from soil, the tops chopped off and the remaining stem bases and root systems air dried in a polytunnel for 4 5 days and then stored at room temperature before assessment for take-all disease.
For root and shoot endophytes, whole plants at the 5-leaf stage (about 20 days old) were carefully shaken free from soil, cut at the root/shoot boundary, washed clean of soil under tap water, placed into separate 500 ml Erlenmeyer flasks (one for the entire shoot and one for the entire root system) and washed in 0.1% Triton X-100 detergent for 10 min with shaking.
Rinse the roots until they are free from any soil debris.
Move the fork all the way around the clump of daylilies until the roots are free from the soil.
Draining wetlands allows organic material in the soil to oxidize, and clearing land of vegetation for crops can free reactive nitrogen from soils.
A 13th century Norwegian royal treatise called The King's Mirror lauds Greenland's suitability for farming: The sun has "sufficient strength, where the ground is free from ice, to warm the soil so that the earth yields good and fragrant grass".
