Abstract
Agriculture, one of the most ancient and diverse pursuits of man, currently touches about 30% of the ice-free land area of our globe: 1.4 × 109 ha of arable land is given to cultivated crops, while another 3.0 × 109 ha is exposed to grazing by domestic animals. Our focus here will be on the arable lands and their crops and forages, beginning with an overview of agricultural systems.
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Loomis, R.S. (1983). Productivity of Agricultural Systems. In: Lange, O.L., Nobel, P.S., Osmond, C.B., Ziegler, H. (eds) Physiological Plant Ecology IV. Encyclopedia of Plant Physiology, vol 12 / D. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68156-1_6
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DOI: https://doi.org/10.1007/978-3-642-68156-1_6
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