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A description of the soil potassium fertility of steepland pastures in the southern North Island of New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University

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Figure

Figure 2. 1 :  Representation of the potassium pools, inputs and losses in a typical soil system under pasture
Figure (A) 2.2: Illustration of the basic 2: 1 layer silicate mineral structure: the clay stack formation, with K (white circle) in the interlayer spaces (A), a single 2: 1 silicate layer, consisting of a central Al-octahedon sheet sandwiched by two rings
Figure 2.3: hydrated by water in a ice-like monolayer as the interlayer space widens near the edge
Figure 2.4: Typical quantity intensity curve in a 2: 1 layer silicate soil exchangeable system dominated by Ca (after Beckett, 1 964 and Evangelou et aI., 1 994)
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