This a great experiense for Greentest team.
Leafy and Salad Vegetables, Bulb and Stem Vegetables
Leafy and salad vegetables: Asparagus Lettuce, Green Lettuce, Cabbage, Chinese cabbage, Shanghai Green Vegetable, Choy Sum, Pak Choi, Gai-Lan, Cauliflower, Broccoli
Bulb and stem vegetables: Asparagus, Celery, Lotus root, Garlic, Onion, Scallion
To test them, please insert the probe of Greentest right into the center of the head (stem core) of the vegetable and make sure that the pin of the probe is NOT between layers or out of flesh. Please remember that any other insertion around the first one (up to 2 cm) might show incorrect result, as after first insertion the cell membranes might be destroyed, vegetable juice will flow-out into the intercellular space and this will influence on the electric conductivity performance and thus final result. Also there will be a higher risk of getting probe pin into the space of previous hole.
Due to the structure of this type of vegetables, the core of the stem is the only part that will show correct results, though they will indicate the highest nitrate level in the tested vegetable.
Root and tuberous vegetables
Cherry Radish, Turnip, Potato, Purple Potato, Sweet Potato, Taro, Yam Rhizome, Ginger, Carrot