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Satellite imagery and modeling contribute understanding cover crop effect on nitrogen dynamics and water availability.
- Source :
- Agronomy for Sustainable Development (Springer Science & Business Media B.V.); Oct2023, Vol. 43 Issue 5, p1-19, 19p
- Publication Year :
- 2023
-
Abstract
- Cover crops (CCs) can affect the cropping systems’ N dynamics and soil water content (SWC), but optimizing their potential effects requires knowledge of their growth pattern, N accumulation, and mineralization. For this purpose, a 3-year field experiment was initiated in northeast Italy involving a maize-soybean rotation. The objectives of this study were to (i) evaluate the use of time series vegetation indices (VIs) obtained from the Sentinel-2 satellite for monitoring the growth of CCs and estimating their biomass and N uptake at termination; (ii) investigate the effects of different CCs on cash crop yield and SWC; and (iii) use the simulation model CC-NCALC to predict the nitrogen contribution of CCs to subsequent cash crops. Three CC systems were tested: a fixed treatment with triticale; a 3-year succession of rye, crimson clover, and mustard; and a control with no CCs. Satellite imagery revealed that rye and triticale grew faster during the winter season than clover but slower compared to mustard, which suffered a frost winterkilling. Both grasses and mustard produced greater biomass at termination compared to clover, but none of the CC species affected SWC or yield and N uptake of the cash crop. A net N mineralization of all the CC residues was estimated by the model (except for the N immobilization after triticale roots residues). During the subsequent cash crop season, the estimated clover and mustard N released was around 33%, and the triticale around 3% of their total N uptake, with a release peak 2 months after their termination. The use of remote sensing imagery and a prediction model of CC residue decomposition showed potential to be used as instruments for optimizing the CCs utilization and enhancing cropping water and N fertilization management efficiency; however, it must be further analyzed with other CCs species, environmental conditions, and cropping systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17740746
- Volume :
- 43
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Agronomy for Sustainable Development (Springer Science & Business Media B.V.)
- Publication Type :
- Academic Journal
- Accession number :
- 172861952
- Full Text :
- https://doi.org/10.1007/s13593-023-00922-8