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Plant sampling guidelines: Proper plant sampling techniques are essential for meaningful evaluation of crop fertility. Be sure to use clean sample bags which breathe freely. Collect a sufficient number of samples to represent the field—at least 25 to 30. Collect the samples from representative parts of the field. Stay away from odd areas unless they are to be sample separately. Collect the correct portion of the plant.

Fertilizers are chemical compounds applied to promote plant and fruit growth. They are usually applied either through the soil (for uptake by plant roots) or by foliar feeding (for uptake through leaves).