Common buckwheat (Fagopyrum esculentum Moench) is a species with great nutritional value and promising to be cultivated as a second crop in irrigated fields of cold-temperate regions with short growing seasons. However, little information exists regarding the nitrogen (N) economy of common buckwheat as a second crop following a high-yielding winter cereal. This study aimed to quantify grain yield, its components, and the grain protein content, and to evaluate N economy processes such as the initial N use efficiency (INUE), the N uptake efficiency (NUptE), the N internal efficiency (NIE) for biomass and grain yield and the N harvest index (NHI) among different treatments of N availability at sowing in four site-year experiments of common buckwheat as a second crop in irrigated fields of the southwestern Pampas of Argentina. The variety Mancan, used in this study, lasted between 73 and 92 days (888–1073 ºC days) from sowing to harvest. Grain yield was highly correlated with achene number but not with achene weight. Grain yield ranged from 405 to 2725 kg ha-1, with an interaction between treatments and experiments, with major differences among experiments and minor differences among N availability treatments. Relative N uptake was maximized at a higher value of N availability (160 kg N ha-1) than grain yield (50 kg N ha-1), associated with higher responses of N uptake, vegetative N uptake and grain protein content than grain yield to N availability. However, NUptE featured a negative response to N availability in all experiments. NHI was highly variable among experiments, ranged between 0.51 and 0.83 and was affected by N availability in only two experiments. NIE for biomass and grain yield were 80 kg kg-1 and 36 kg kg-1, respectively, which were lower than those of most cereals but higher than those of other non-cereal grain crops. A short crop cycle of the variety Mancan, an average grain yield of 1594 kg ha-1 among experiments in this study, a low N availability requirement to maximize grain yield and high values of NIE for biomass and for grain yield suggest that buckwheat is a promising species for second crop sowing in cold-temperate regions.
Rotili, D. H.; Guglielmini, A. C.; Caccavo, M.; Antequera, S. A.; Rocca, C. M. & Miralles, D. J. (2023). Grain yield, yield components and nitrogen economy of irrigated second - crop common Buckwheat (Fagopyrum esculentum Moench) in a cold - temperate region. European Journal of Agronomy,144.,art.126750
10.1016/j.eja.2023.126750
Rotili, Diego Hernán, Guglielmini, Antonio César, Caccavo, Matías, Antequera, Sandra Amira, Rocca, Carlos María, Miralles, Daniel Julio. 2023. "Grain yield, yield components and nitrogen economy of irrigated second - crop common Buckwheat (Fagopyrum esculentum Moench) in a cold - temperate region". European Journal of Agronomy 144.:art.126750.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2023rotili