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534 results on '"Vanlauwe, B."'

24. Predicting intercrop competition, facilitation, and productivity from simple functional traits

Author

Maclaren, C., Waswa, W., Aliyu, K. T., Claessens, L., Mead, A., Schob, C., Vanlauwe, B., and Storkey, J.

Subjects
Intercropping, Competition, Soil Science, Facilitation, Complementarity, Agronomy and Crop Science, Functional traits, Productivity
Abstract

Context Recent meta-analyses demonstrate that intercropping can increase the land use efficiency of crop production by 20–30 % on average, indicating a strong potential contribution to sustainable intensification. However, there is substantial variability around this average: individual studies range from half to double the land productivity of monocrops. Legume-cereal intercrops and intercrops with high temporal niche separation tend to be more productive than the average, but these two combination types are not always suitable. There is a need to explore other possibilities to achieve productive intercrops.

Published
2023

36. Towards spatially continuous mapping of soil organic carbon in croplands using multitemporal Sentinel-2 remote sensing

Author

UCL - SST/ELI/ELIC - Earth & Climate, Shi, Pu, Six, J., Sila, A., Vanlauwe, B., Van Oost, Kristof, UCL - SST/ELI/ELIC - Earth & Climate, Shi, Pu, Six, J., Sila, A., Vanlauwe, B., and Van Oost, Kristof

Abstract

Intensified human activities can augment soil organic carbon (SOC) losses from the world’s croplands, making SOC a highly dynamic parameter both in space and time. Sentinel-2 spectral imagery is well placed to capture the spatiotemporal variability of SOC, but its capability has only been demonstrated for agricultural regions mostly located in Europe. Furthermore, most studies so far only used single-date images that resulted in spatially non-continuous SOC maps, hampering their ability to aid multiscale SOC assessments. Here, we aim to achieve spatially continuous mapping of SOC in croplands, by creating multitemporal bare soil composites that maximize cropland coverage in two regions of varying agroecosystems and landscape structure in the Northeast China Chernozem region and the Belgian Loam Belt. Bare soil pixels were extracted via spectral index thresholding that excluded contaminated pixels from external perturbance. Multitemporal soil composites were then obtained by averaging over multiple single-date bare soil images that were selected within pre-determined optimal time-windows, corresponding to the region-specific crop sowing periods when best possible surface conditions were expected. Results show that the optimal time-window filter ensured selective inclusion of single-date images that themselves yielded stable and robust SOC predictions across multiple years. Spectral-based models developed from multitemporal composites consistently produced better or similar prediction accuracies than single-date images for both study regions (R2: 0.52–0.62; RMSE: 0.17–0.21 g 100 g−1), while also achieved maximum cropland coverage (>82 %). Bootstrap modelling demonstrated that SOC mapping via multitemporal Sentinel-2 data was associated with small uncertainties. Investigations into the significant spectral bands that contributed to the prediction of SOC suggested that, regardless of the study regions, the physical relationship between spectral bands and SOC that predom

Published
2022

37. Coupled forest zoning and agricultural intervention yields conflicting outcomes for tropical forest conservation in the Democratic Republic of the Congo (DRC)

Author

Nackoney, J, primary, Demol, M, additional, Akpona, H A, additional, Bauters, M, additional, Boeckx, P, additional, Dupain, J, additional, Facheux, C, additional, Hansen, M C, additional, Kalemba, J-C, additional, Kehbila, A G, additional, Potapov, P, additional, Tabu Senga, A, additional, Six, J, additional, Turubanova, S, additional, Williams, D, additional, and Vanlauwe, B, additional

Published
2022
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48. The Phosphate Inhibition Paradigm: Host and Fungal Genotypes Determine Arbuscular Mycorrhizal Fungal Colonization and Responsiveness to Inoculation in Cassava With Increasing Phosphorus Supply

Author

Peña Venegas, R.A., Lee, S.J., Thuita, M., Mlay, D.P., Masso, C., Vanlauwe, B., Rodriguez, A., and Sanders, I.R.

Subjects
inoculation responsiveness, fungi, food and beverages, Plant culture, Plant Science, Manihot esculenta Cranz, mycorrhizal symbiosis, phosphate inhibition, SB1-1110, phosphorus fertilization, intraspecific variation, Rhizophagus irregularis, phosphate, Original Research
Abstract

A vast majority of terrestrial plants are dependent on arbuscular mycorrhizal fungi (AMF) for their nutrient acquisition. AMF act as an extension of the root system helping phosphate uptake. In agriculture, harnessing the symbiosis can potentially increase plant growth. Application of the AMF Rhizophagus irregularis has been demonstrated to increase the yields of various crops. However, there is a paradigm that AMF colonization of roots, as well as the plant benefits afforded by inoculation with AMF, decreases with increasing phosphorus (P) supply in the soil. The paradigm suggests that when fertilized with sufficient P, inoculation of crops would not be beneficial. However, the majority of experiments demonstrating the paradigm were conducted in sterile conditions without a background AMF or soil microbial community. Interestingly, intraspecific variation in R. irregularis can greatly alter the yield of cassava even at a full application of the recommended P dose. Cassava is a globally important crop, feeding 800 million people worldwide, and a crop that is highly dependent on AMF for P uptake. In this study, field trials were conducted at three locations in Kenya and Tanzania using different AMF and cassava varieties under different P fertilization levels to test if the paradigm occurs in tropical field conditions. We found that AMF colonization and inoculation responsiveness of cassava does not always decrease with an increased P supply as expected by the paradigm. The obtained results demonstrate that maximizing the inoculation responsiveness of cassava is not necessarily only in conditions of low P availability, but that this is dependent on cassava and fungal genotypes. Thus, the modeling of plant symbiosis with AMF under different P levels in nature should be considered with caution.

Published
2021

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