Application of organic carbon affects mineral nitrogen uptake by winter wheat and leaching in subsoil: Proximal sensing as a tool for agronomic practice

0523938 - ÚVGZ 2021 RIV NL eng J - Článek v odborném periodiku
Holub, Petr - Klem, Karel - Tůma, I. - Vavříková, J. - Surá, Kateřina - Veselá, Barbora - Urban, Otmar - Záhora, J.
Application of organic carbon affects mineral nitrogen uptake by winter wheat and leaching in subsoil: Proximal sensing as a tool for agronomic practice.
Science of the Total Environment. Roč. 717, MAY 15 2020 (2020), č. článku 137058. ISSN 0048-9697. E-ISSN 1879-1026
Grant CEP: GA MŠMT(CZ) EF16_019/0000797
Výzkumná infrastruktura: CzeCOS III - 90123
Institucionální podpora: RVO:86652079
Klíčová slova: long-term tillage * chlorophyll content * vegetation indexes * remote estimation * n fertilizer * soil * reflectance * crop * management * dynamics * Ammonium * Crop * Grain yield * Nitrates * Protein content * Vegetation index
Obor OECD: Ecology
Impakt faktor: 7.963, rok: 2020
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0048969720305684?via%3Dihub

We tested the hypothesis that application of stable forms of organic carbon (C) into the soil reduces leaching of nitrogen (N). We also examined the potential to estimate N leaching employing N-sensitive spectral reflectance indices. During three growing seasons 2013-2015, field experiment at two experimental sites combining application of distinct N doses (0 (N-0), 35 (N-35), 70 (N-70), and 140 (N-140) kg N ha(-1)) and two stable forms of organic C (lignohumate and compost) was established to measure N uptake by winter wheat and its leaching to subsoil layers. The spectral reflectance al canopy level was measured simultaneously with N content in leaf dry matter at the beginning of the grain filling phase. At full maturity, the above-ground biomass, grain yield, and grain protein content were evaluated. That data was used to calculate N uptake in grain. The N-140 dose led to increased N uptake by grain of 64% and 73% in the wetter years 2013 and 2014, respectively, and even by 118% in the drier year 2015 in comparison with the N-0 treatment. N leaching to subsoil increased substantially with higher N close, but only in wetter years 2013 (by 74%) and 2014 (by 87%). By contrast, no effect of N dose on leached N was found in the dry year 2015. The application of organic C along with the N-140 dose substantially reduced N leaching by 26% and 29% in 2014 and 2015, respectively. Moreover, we demonstrated that normalized red-edge spectral reflectance index (NRERI) is able to predict N uptake by wheat and it can serve as an indicator of N leaching in heavy-rainfall years. Our results thus point towards possible agronomic practices and use of remote-sensing techniques to reduce groundwater contamination by N-based fertilizers. (C) 2020 Elsevier B.V. All rights reserved.
Trvalý link: http://hdl.handle.net/11104/0308690