覆盖作物对减少农业区水污染物的有效性

IF 1.4 4区 农林科学 Q3 AGRICULTURAL ENGINEERING Transactions of the ASABE Pub Date : 2021-01-01 DOI:10.13031/trans.14028
R. Christianson, J. Fox, N. Law, Carol Wong
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引用次数: 7

摘要

随着覆盖作物生物量产量的增加,覆盖作物导致的氮损失减少趋于改善。混合磷损失减少导致冻融循环发生的寒冷气候,并可能增加溶解磷损失。谷类黑麦是研究的主要覆盖作物,往往提供最大的水质效益。减少农田的养分损失可以保留这些养分用于随后的作物生产,并降低下游水质的风险。本研究评估了覆盖作物作为一年生种植系统的一部分对减少养分损失和改善水质的影响。本文回顾了覆盖作物有关水质的文献,以确定影响覆盖作物性能和成本的重要因素。结果表明,与豆科植物(可以忽略不计)相比,以草为基础的覆盖作物和与草混合的作物倾向于增加硝酸盐损失的减少(40%)。生物量的增长也很重要,在生长程度日数增加的地区,提前播种或种植覆盖作物可以提高生产性能。对于磷损失,效益并不一定随着生物量的增加而增加。此外,由于冻融循环,溶解磷浓度可能增加(23%),尽管由于径流减少,总溶解磷损失趋于减少(34%)。覆盖作物的实施成本从连续5年种植大豆和玉米每年分别节省25美元到44美元不等,到每年节省193美元。在每年的作物轮作中包括一种覆盖作物,在秋季有足够的时间发芽和生长,可以减少生产农业中的氮和磷损失,帮助实现美国各地的水质目标。关键词:捕获作物,氮,NRCS,磷,实践准则340,美国农业部,水质。
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Effectiveness of Cover Crops for Water Pollutant Reduction from Agricultural Areas
HighlightsNitrogen loss reduction due to a cover crop tends to improve with increased cover crop biomass production.Mixed phosphorus loss reduction results in cold climates where freeze-thaw cycles occur and can increase dissolved phosphorus losses.Cereal rye was the primary cover crop studied and tended to provide the most water quality benefits.Abstract. Mitigating nutrient losses from agricultural fields retains these nutrients for subsequent crop production and reduces the risk to downstream water quality. This study evaluated the impact of cover crops, as part of an annual cropping system, on reducing nutrient losses and enhancing water quality. Cover crop literature focusing on water quality was reviewed to determine important factors regarding cover crop performance and cost. Results show that a grass-based cover crop and mixes with grasses tend to increase nitrate loss reduction (40%) compared to legumes (negligible). Biomass growth was also important, with early seeding or growth of a cover crop in areas with increased growing degree days enhancing performance. For phosphorus loss, benefits did not necessarily increase with increasing biomass. Further, dissolved phosphorus concentrations may increase due to freeze-thaw cycles (23%), although overall dissolved phosphorus losses tend to decrease due to less runoff (34%). Cover crop implementation costs ranged from a savings of $25 to $44 ha-1 year-1 before soybeans and corn, respectively, when implementing a cover crop for five straight years to a cost of $193 ha-1 year-1. Including a cover crop in annual crop rotations with adequate time in the fall for germination and growth can reduce nitrogen and phosphorus losses from production agriculture to help meet water quality goals across the U.S. Keywords: Catch crop, Nitrogen, NRCS, Phosphorus, Practice Code 340, USDA, Water quality.
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来源期刊
Transactions of the ASABE
Transactions of the ASABE AGRICULTURAL ENGINEERING-
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.
期刊最新文献
Effectiveness of Nutrient Management for Reducing Phosphorus Losses from Agricultural Areas. Effectiveness of Nutrient Management on Water Quality Improvement: A Synthesis on Nitrate-Nitrogen Loss from Subsurface Drainage. Comparison of Droplet Size, Coverage, and Drift Potential from UAV Application Methods and Ground Application Methods on Row Crops. Effectiveness of Conservation Crop Rotation for Water Pollutant Reduction from Agricultural Areas. Experimental Study on Critical Shear Stress of Cohesive Soils and Soil Mixtures
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