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PLant_case1_key - (as is evident in data Decreased P...

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Key for Eric’s first plant case Important elements of solution: - Both coffee and Inga are endomycorrhizal. - Inga (legume) is an N fixer, and its presence in the plantation greatly enhances N availability in soil (primarily through decomposition of its N-rich leaf litter). - Ultisol is a highly weathered, acidic soil deficient in base cations and available P. - Benomyl is a systemic fungicide that effectively contains both coffee diseases but also severely inhibits root colonization by endomycorrhizae. (In fact, it is used experimentally as a means of generating nonmycorrhizal plants.) - Owing to its adverse affect on endomycorrhizae, periodic application of Benomyl to plantation (outside of buffer area) leads to decline in P uptake by both coffee and Inga
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Unformatted text preview: (as is evident in data). - Decreased P uptake (outside of buffer area) directly causes some decline in coffee yield, and it also causes decline in N fixation and growth of Inga. - Less N fixation and growth by Inga leads to less leaf litterfall and lower N input to ecosystem outside of buffer area (as is indicated by data). - Lower N availability to coffee also contributes to bean yield loss. Possible short-term solution: Simply fertilize with P (or N and P), either in organic (e.g., manure) or inorganic form. (Organic vs. inorganic is an aside – but the former promotes nutrient retention in ecosystem.)...
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