As a perishable commodity, a variety of factors can reduce the yield of crops after harvest including heat, mechanical damage, and microbial spoilage.

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Depending on the field conditions at the time of harvest, the lettuce can have varying amounts of dirt on the surface of and in the crevices of the leaves.

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Oxygen is essential for the development of a healthy root system, both for aerobic respiration of the roots and to support beneficial aerobic bacteria.

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For commercial gardeners and hobbyists alike, the measurement of soil pH can help one better understand what types of plants can be grown, and much more.

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