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Background Arbuscular mycorrhizal (AM) fungi contribute to plant nutrient uptake in systems managed with reduced fertilizer and pesticide inputs such as organic agriculture by extending the effective size of the rhizosphere and delivering minerals to the root. Connecting the molecular study of the AM symbiosis with agriculturally- and ecologically-relevant field environments remains a challenge and...
Immobilization of ammonium (NH 4+ ) by plants and microbes, a controlling factor of ecosystem nitrogen (N) retention, has usually been measured based on uptake of15NH 4+ solutions injected into soil. To study the influence of roots on N dynamics without stimulating consumption of NH 4+ , we estimated gross nitrification in the presence or absence of live roots in an agricultural soil. Tomato (...
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