Field measurement of net nitrogen mineralization of manured soil cropped to maize |
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Authors: | Stefano Monaco Dario Sacco Teresa Borda Carlo Grignani |
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Institution: | 1. Dipartimento di Agronomia, Selvicoltura e Gestione del Territorio, Università degli Studi di Torino, Via Leonardo da Vinci 44, 10095, Grugliasco, Turin, Italy 2. Dipartimento di Valorizzazione e Protezione delle Risorse Agroforestali, Università degli Studi di Torino, Via Leonardo da Vinci 44, 10095, Grugliasco, Turin, Italy
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Abstract: | We evaluated the in situ net nitrogen (N) mineralization in a soil cropped to maize and fertilized for 11 years with cattle
slurry or farmyard manure, both common on livestock farms of the Po River valley in Northern Italy. The net N mineralization
of the tilled soil layer was measured in six consecutive incubation periods after manure application, for a total of 12 weeks,
using the polyethylene buried bags technique. Results showed that net N mineralization was followed by N immobilization and
finally, by mineralization whose rate increase until maize flowering. On average, net N mineralization was 70.4 kg N ha−1, with the majority being released during the last measurement period. The time and extent of net N mineralization and plant
N uptakes were not affected by fresh manure application. Instead, the effect of past management increased the maximum net
N mineralization rate obtained with farmyard manure. The buried bag technique probably underestimates the total amount of
mineralized N available for crop growth because it excludes the presence of the plant. |
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