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the phloem not only large amounts of sucrose but also amino acids are transported, and that this transport is connected with that of several cations (particularly K+; Herdel et al. 2001).

Figure 2.3.5 shows the multiple interactions between nutrient uptake and various organs of plants, using the example of nitrate and its turnover (Marschner 1995). Clearly, transport and retention of a nutrient do not occur independently of other nutrients and are almost always

C02 of soil respiration

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Glucose

Rubisco pep

K+ Malate"

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