Elucidating the role and contribution of cover crop roots to soil fertility and crop nutrition in organic cropping systems

阐明有机耕作系统中覆盖作物根系对土壤肥力和作物营养的作用和贡献

• 批准号: RGPIN-2016-05273
• 负责人: Halde, Caroline
• 金额: $ 1.68万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=634239
• 关键词: Elucidating; role; contribution; cover; crop

Nitrogen budgeting is a complex task in organic cropping systems, because crop fertilization is based on organic fertilizers (animal manures, cover crops, compost, etc.) rather than readily available mineral fertilizers. Many unknowns remain on the contribution of these organic fertilizers to the nutrition of subsequent crops, and particularly on the contribution of cover crop roots to soil N budget. Indeed, generally, only the shoot biomass of cover crops is considered when estimating the contribution of cover crops to nitrogen budget and fertilization plan. However, cover crop roots are hypothesized to contribute considerably to the soil N supply of agricultural soils. No research has previously addressed these important and innovative research questions.

在有机种植系统中，氮预算是一项复杂的任务，因为作物施肥是基于有机肥料（动物粪便、覆盖作物、堆肥等），而不是现成的矿物肥料。这些有机肥料对后续作物营养的贡献仍然存在许多未知数，特别是覆盖作物根部对土壤氮预算的贡献。事实上，在估计覆盖作物对氮预算和施肥计划的贡献时，通常只考虑覆盖作物的地上部生物量。然而，据推测覆盖作物根部对农业土壤的土壤氮供应有很大贡献。此前还没有研究解决这些重要且创新的研究问题。