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Fig. 1. The two types of production function as explained in Section 2. For an explanation of the points Q and R, see Sections 3.4 and5.1, respectively.
Fig. 2. Correlation between photosynthetic capacity and nitrogen levels in leaves of Piper hispidumdata from Field (1988), with added drawn lines (range in which measurements were obtained) and extended dashed lines (extrapolations) and Piper auritum
Fig. 3. Input–output relations of nitrogen in Dutch dairying from1965 to 1985. The apparent output per unit input seems to de-crease at increasing input rates (when the contribution of soil-Nis not deducted), but the marginal responses to external inputs areconstant (adapted from van der Meer, in de Wit, 1992).
Fig. 4. Yield responses of alfalfa to irrigation treatment in N. Dakota. Drawn straight line: response as envisioned by Huibers and Stroosnijder.Dashed curved lines: alternative response as suggested by M
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