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
基本信息
- 批准号:RGPIN-2016-05273
- 负责人:
- 金额:$ 1.68万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Discovery Grants Program - Individual
- 财政年份:2016
- 资助国家:加拿大
- 起止时间:2016-01-01 至 2017-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
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.
The long-term objective of the proposed research program is to elucidate the mechanisms of contribution of cover crop roots to soil fertility and crop nutrition. The short-term objectives of the proposed research program are 1) to quantify and differentiate the contribution of cover crop shoots and roots to the soil N dynamics; 2) to improve the current conceptual model of transfer of cover crop residue N into various soil organic and inorganic fractions; 3) to elucidate the temporal dynamics of N derived from the decomposition of cover crop roots in the soil-plant continuum; and 4) to synchronize the N supply from decomposing cover crops with N uptake of cash crops grown under organic management.
Two field experiments and one incubation study will be conducted to achieve the research objectives. The field experiment #1 will compare the shoot and root characteristics of different cover crop species incorporated at different termination stages, and their contribution to organic corn nutrition. The long-term incubation study will quantify the contribution of cover crop roots and shoots to soil N supply. A second field experiment will be conducted using cover crop material grown in 15N-enriched environment, to address specific unknowns about N partitioning in various soil N fractions.
My research will provide a fundamental understanding of cover crop root decomposition and associated soil N supply to plants and to the replenishment of the soil reserve and to plants. This will allow for better estimation of the soil N supply to subsequent crops and, therefore, for better forecasting of the need for other N organic amendments. Knowledge of the actual contribution of cover crop roots will be integrated in farm N budgets, therefore conceptually advancing the cover cropping and nutrient budgeting in organic cropping systems. Moreover, increase in crop yield due to better N management and timing would represent important gains in revenues to farmers. On a broader scale, gathering information on soil N budget may help to reduce N losses from cover crop-based cropping systems like organic farming systems.
在有机种植系统中,氮收支是一项复杂的任务,因为作物施肥是基于有机肥料(动物粪便,覆盖作物,堆肥等)。而不是容易获得的矿物肥料。这些有机肥料对后茬作物营养的贡献,特别是覆盖作物根系对土壤氮收支的贡献,仍有许多未知数。实际上,在估算覆盖作物对氮收支和施肥计划的贡献时,一般只考虑覆盖作物的地上部生物量。然而,覆盖作物根系被假设为农业土壤的土壤氮供应作出了巨大贡献。以前没有任何研究涉及这些重要和创新的研究问题。
该研究计划的长期目标是阐明覆盖作物根系对土壤肥力和作物营养的贡献机制。近期研究目标是:1)定量和区分覆盖作物根系和地上部对土壤氮素动态的贡献,2)改进现有的覆盖作物残体氮素向土壤有机无机组分转移的概念模型,3)阐明覆盖作物根系分解产生的氮素在土壤-植物连续体中的时间动态,4)研究覆盖作物根系分解产生的氮素在土壤-植物连续体中的动态。(4)有机管理条件下,分解覆盖作物的供氮与经济作物的吸氮同步。
为达到研究目的,将进行两项田间试验和一项孵化研究。田间试验#1将比较在不同终止阶段并入的不同覆盖作物物种的茎和根特征,以及它们对有机玉米营养的贡献。长期培养研究将量化覆盖作物根和芽对土壤供氮的贡献。第二个田间试验将使用覆盖作物材料生长在15 N富集的环境中,以解决具体的未知数氮分配在不同的土壤氮组分。
我的研究将提供一个基本的了解覆盖作物根系分解和相关的土壤氮供应植物和土壤储备和植物的补充。这将允许更好地估计土壤氮供应到随后的作物,因此,更好地预测需要其他N有机添加剂。覆盖作物根系的实际贡献的知识将被集成在农场N预算,因此在概念上推进覆盖种植和有机种植系统的养分预算。此外,由于更好的氮管理和时机,作物产量的增加将代表农民收入的重要收益。在更广泛的范围内,收集有关土壤氮收支的信息可能有助于减少以覆盖作物为基础的种植系统(如有机农业系统)的氮损失。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
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Halde, Caroline其他文献
Selecting Cover Crop Mulches for Organic Rotational No-Till Systems in Manitoba, Canada
- DOI:
10.2134/agronj13.0402 - 发表时间:
2014-07-01 - 期刊:
- 影响因子:2.1
- 作者:
Halde, Caroline;Gulden, Robert H.;Entz, Martin H. - 通讯作者:
Entz, Martin H.
Halde, Caroline的其他文献
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{{ truncateString('Halde, Caroline', 18)}}的其他基金
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 - 财政年份:2021
- 资助金额:
$ 1.68万 - 项目类别:
Discovery Grants Program - Individual
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 - 财政年份:2020
- 资助金额:
$ 1.68万 - 项目类别:
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琉森的内部使用者的评估以及魁北克人的易消化的信息
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514751-2017 - 财政年份:2019
- 资助金额:
$ 1.68万 - 项目类别:
Collaborative Research and Development Grants
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 - 财政年份:2019
- 资助金额:
$ 1.68万 - 项目类别:
Discovery Grants Program - Individual
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 - 财政年份:2018
- 资助金额:
$ 1.68万 - 项目类别:
Discovery Grants Program - Individual
Évaluation de l'intérêt d'utiliser une luzerne plus digestible sur les fermes laitières québécoises
琉森的内部使用者的评估以及魁北克人的易消化的信息
- 批准号:
514751-2017 - 财政年份:2018
- 资助金额:
$ 1.68万 - 项目类别:
Collaborative Research and Development Grants
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 - 财政年份:2017
- 资助金额:
$ 1.68万 - 项目类别:
Discovery Grants Program - Individual
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$ 1.68万 - 项目类别:
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综合绿肥-凝视系统
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- 资助金额:
$ 1.68万 - 项目类别:
Postgraduate Scholarships - Doctoral
Integrated green manure - gazing systems
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- 批准号:
347256-2009 - 财政年份:2009
- 资助金额:
$ 1.68万 - 项目类别:
Postgraduate Scholarships - Doctoral
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