ENERGY requirements for tilling, planting, fertilization, cultivation, pest control and har-vesting are presented for cotton, alfalfa, lettuce, and barley. The irrigation energy requirement is given for both surface and ground water supplies using surface and sprinkler irrigation systems. Energy requirements are discussed in terms of average crop energy yield per unit of energy input ana average crop value per unit of energy. The potential for usage changes or conservation of energy is also discussed.
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Larson et al. (1978) studied this question.