IMPACT4SOIL OpenAire HAL INRAE Bielefeld Academic Search Engine (BASE) UnpayWall HAL-UPMC Horizon / Pleins textes Crossref Microsoft Academic Graph http://millsonia.free.fr/publications/noguera2010SBB.pdf https://doi.org/10.1016/j.soilbio.2010.03.001 Soil Biology and Biochemistry Open Access 2010-03-17 2011-03-17 Abstract Adding biochar to soils and maintaining high earthworm biomasses are potential ways to increase the fertility of tropical soils and the sustainability of crop production in the spirit of agroecology and ecological engineering. However, a thorough functional assessment of biochar effect on plant growth and resource allocations is so far missing. Moreover, earthworms and biochar increase mineral nutrient availability through an increase in mineralization and nutrient retention respectively and are likely to interact through various other mechanisms. They could thus increase plant growth synergistically. This hypothesis was tested for rice in a greenhouse experiment. Besides, the relative effects of biochar and earthworms were compared in three different soil treatments (a nutrient rich soil, a nutrient poor soil, a nutrient poor soil supplemented with fertilization). Biochar and earthworm effects on rice growth and resource allocation highly depended on soil type and were generally additive (no synergy). In the rich soil, there were both clear positive biochar and earthworm effects, while there were generally only positive earthworm effects in the poor soil, and neither earthworm nor biochar effect in the poor soil with fertilization. The analysis of earthworm and biochar effects on different plant traits and soil mineral nitrogen content, confirmed that they act through an increase in nutrient availability. However it also suggested that another mechanism, such as the release in the soil of molecules recognized as phytohormones by plants, is also involved in earthworm action. This mechanism could for example help explaining how earthworms increase rice resource allocation to roots and influence the allocation to grains. [SDE] Environmental Sciences 330 earthworms FAUNE DU SOL fertilidad del suelo 630 12. Responsible consumption AZOTE AMENDEMENT DU SOL CROISSANCE arroz 2. Zero hunger BIOMASSE FERTILITE DU SOL rice soil fertility AMMONIUM 04 agricultural and veterinary sciences 15. Life on land RIZICULTURE 6. Clean water oryza sativa 13. Climate action [SDE]Environmental Sciences ENGRAIS ORGANIQUE FERTILISATION DU SOL 0401 agriculture, forestry, and fisheries fauna del suelo RAPPORT CN soil fauna RAPPORT C/N LOMBRIC NITRATE Patrick Lavelle, Patrick Lavelle, Kam-Rigne Laossi, Sébastien Barot, Maria Helena Catelli de Carvalho, Marco Antonio Rondón, Diana Cristina Noguera, Diana Cristina Noguera, Valerio Hoyos, 2010-07-01 journalpaper Abstract Adding biochar to soils and maintaining high earthworm biomasses are potential ways to increase the fertility of tropical soils and the sustainability of crop production in the spirit of agroecology and ecological engineering. However, a thorough functional assessment of biochar effect on plant growth and resource allocations is so far missing. Moreover, earthworms and biochar increase mineral nutrient availability through an increase in mineralization and nutrient retention respectively and are likely to interact through various other mechanisms. They could thus increase plant growth synergistically. This hypothesis was tested for rice in a greenhouse experiment. Besides, the relative effects of biochar and earthworms were compared in three different soil treatments (a nutrient rich soil, a nutrient poor soil, a nutrient poor soil supplemented with fertilization). Biochar and earthworm effects on rice growth and resource allocation highly depended on soil type and were generally additive (no synergy). In the rich soil, there were both clear positive biochar and earthworm effects, while there were generally only positive earthworm effects in the poor soil, and neither earthworm nor biochar effect in the poor soil with fertilization. The analysis of earthworm and biochar effects on different plant traits and soil mineral nitrogen content, confirmed that they act through an increase in nutrient availability. However it also suggested that another mechanism, such as the release in the soil of molecules recognized as phytohormones by plants, is also involved in earthworm action. This mechanism could for example help explaining how earthworms increase rice resource allocation to roots and influence the allocation to grains. Contrasted Effect Of Biochar And Earthworms On Rice Growth And Resource Allocation In Different Soils 10.1016/j.soilbio.2010.03.001