Substrates are described at length. The physical, chemical, thermal, and biological characteristics of substrates are presented to provide readers with an understanding of how substrate affects the root zone environment. Suggestions for selecting substrate ingredients, mixing substrate, and determining the amount of substrate needed are offered as well. The difficulties with and benefits of hydroponic culture are briefly addressed. Water and Nutrient Management for Greenhouses was written by eleven members of the Cornell Controlled Environment Agriculture Working Group, Cornell Cooperative Extension, College of Agriculture and Life Sciences, Cornell University.
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