Does the critical N dilution curve for maize crop vary across genotype x environment x management scenarios? - a Bayesian analysis,European Journal of Agronomy

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Does the critical N dilution curve for maize crop vary across genotype x environment x management scenarios? - a Bayesian analysis
European Journal of Agronomy ( IF 5.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.eja.2020.126202
Ignacio A. Ciampitti , Javier Fernandez , Santiago Tamagno , Ben Zhao , Gilles Lemaire , David Makowski

Abstract Improving the prediction of plant N status for field crops require robust estimation of their critical N dilution curves and their parameters. For maize (Zea mays L.), several studies have contributed to develop separate critical N curves for different genotype, environment, and management (GxExM) combinations, but so far no rigorous analysis has been formally conducted to assess if the use of different curves is fully supported by experimental data and to understand if a more universal curve could be used for defining the plant N status of this crop. This study presents a global synthesis of maize data related to plant biomass and plant N concentration (%N) with the main objective of implementing a Bayesian framework for fitting critical N curves (Nc = A1 W−A2) and testing the existence of differences in the main parameters of the curve (A1 and A2) across varying GxExM combinations. Five publications including trials with at least four sampling times for plant biomass were selected based on a systematic review of the literature. Biomass and %N pairs (n = 369) measured during vegetative growth were extracted from the selected papers and included in a dataset covering four countries (China, US, Canada, and France) and twenty different GxExM combinations. Results of the Bayesian analysis revealed that the critical plant %N and biomass fitted for each GxExM combination presented negligible statistical differences for A1 but minor variation for A2 reflecting changes in N dilution pattern with biomass mostly when W was above 5 Mg ha-1 (%Nc

更新日期：2021-02-01

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