For source water samples, the tap is open and water allowed to run five minutes before sampling. The opened sample bottle is placed under the stream of water until the bottle is filled. Some water is poured out to allow one-half inch of air space. For nutrient solutions in float beds, the capped sample bottle should be placed in the solution to a depth of three inches above the top of the bottle. The cap of the bottle is open when submerged to allow the bottle to be filled.
Some solution is poured out to leave one-half inch of air space.
For overhead irrigation systems, the procedure outlined for source water should be used for sampling. The sample should be taken far enough from fertilizer injection to ensure complete mixing of the nutrients in the solution before the sample is taken. The sample should be promptly taken to a UK county extension office . An information form is required to be submitted with the sample. All samples should be packed well so they are protected from rough handling.