| Autor: |
Ambrosino, Mariela Lis, Martínez, Juan Manuel, Busso, Carlos Alberto, Minoldo, Gabriela Verónica, Torres, Yanina Alejandra, Ithurrart, Leticia Soledad, Cardillo, Daniela Solange |
| Zdroj: |
Journal of Soil Science and Plant Nutrition; 20210101, Issue: Preprints p1-7, 7p |
| Abstrakt: |
The objective of this study was to evaluate the effects of moderate defoliation and grass species on soil nitrogen (N) mineralization in a semiarid grassland of northeastern Patagonia, Argentina. Studied species were Poa ligularisand Nassella tenuis(desirable/preferred by cattle) and Amelichloa ambigua(undesirable/non preferred). Two defoliations were made to a 5 cm stubble height during the growing season. Hypotheses were that (1) net N mineralization and N availability in the soil are increased by a moderate defoliation and greater species forage quality, and (2) potential N mineralization is higher in the soil beneath the desirable than undesirable species. In 2013 and 2014, in situ net N mineralization was estimated using the tube incubation technique under field conditions. Potential N mineralization was estimated by long-term laboratory incubations. Defoliation treatments did not affect the soil inorganic N dynamics. The soil under A. ambiguashowed a greater in situ net N mineralization than other species, but only in 2013. Poa ligularispresented the highest initial inorganic N and potentially mineralizable N values. However, the opposite was recorded in this specie for the mineralization constant rate. These results demonstrated that moderate defoliations did not affect soil N availability, and presence of the desirable perennial grasses increased the potential N mineralization pool. Sustainable management practices that promote the persistence of these species in plant community are important to maintain soil fertility on semiarid grasslands. |
| Databáze: |
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