info:eu-repo/semantics/article
Anaerobically incubated nitrogen improved nitrogen diagnosis in corn
Fecha
2017-01Registro en:
Orcellet, Juan; Reussi Calvo, Nahuel Ignacio; Sainz Rozas, Hernan Rene; Wyngaard, Nicolás; Echeverria, Hernan Eduardo; Anaerobically incubated nitrogen improved nitrogen diagnosis in corn; American Society of Agronomy; Agronomy Journal; 109; I; 1-2017; 291-298
0002-1962
CONICET Digital
CONICET
Autor
Orcellet, Juan
Reussi Calvo, Nahuel Ignacio
Sainz Rozas, Hernan Rene
Wyngaard, Nicolás
Echeverria, Hernan Eduardo
Resumen
Current N diagnostic methods for corn (Zea mays L.) are often based on the nitrate nitrogen (NO3––N) concentration before planting (pre-plant nitrate test, PPNT) and nitrate nitrogen (NO3––N) concentration at V6 stage (PSNT). These tests provide scant information on soil N mineralization during the growing season, which can supply a considerable proportion of corn N requirements. The objective of our study was to evaluate if in-season N recommendations could be improved by inclusion of a N mineralization potential estimator. We conducted field experiments (n = 35) in three different areas and in two planting dates. At each site we evaluated PPNT, PSNT, and NH4–N released during anaerobic incubation (Nan), which were then related to corn yield in unfertilized plots (0N) and corn response to nitrogen fertilization (Nresp%) using multiple regression analysis. The sole incorporation of Nan to PPNT and PSNT models improved their capacity to predict corn yield in 0N plots and Nresp% only in areas with similar edaphic-climatic characteristics. Independently of the geographical region, when PPNT and PSNT were combined with Nan, texture, and temperature, their capacity to predict yield in 0N plots was increased (PPNT: from R2 0.02–0.47; PSNT: from R2 0.09–0.53), as it was their capacity to estimate Nresp% (PPNT: from R2 0.06–0.23; PSNT: from R2 0.19–0.42). The inclusion of Nan can improve traditional N diagnostic models when it is combined with edaphic/climatic properties that account for the mineralization rate of this N pool.