Applying coal char to cattle pens for sustainable agriculture in the semiarid US High Plains

IF 1.3 Q3 AGRONOMY
Vesh R. Thapa, Bijesh Maharjan, Karla Wilke
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Abstract

Applying high carbon (C) additive to cattle pens and land application of the resultant manure mix offers a potential strategy for optimizing manure and soil management while mitigating environmental concerns. An experiment was conducted in western Nebraska from 2019 to 2022 to evaluate the effect of adding coal char (∼290 g C kg−1 by wt.) on feedlot manure's properties and stability and the interacting effect of manure-char on crop yields in a corn (Zea mays L.)–dry bean (Phaseolus vulgaris L.)–corn rotation. Treatments in the crop field included manure from pens with or without char (each at 34 and 68 Mg ha−1; low and high rate), urea at 100% recommended nitrogen (N) rate with or without 45 Mg char ha−1, and a control. Applying char to pens kept them drier following snowfall events. The high surface area and cation exchange capacity of char improved soil and manure nutrient retention. The 100% urea-N plus char treatment had a greater corn yield than the low-rate char–manure mix or high-rate manure in 2020. In 2021, there was a trend for higher bean yields with the high char–manure rate treatment than the control. In 2022, all the fertilized treatments had greater grain yields than the control. A one-time high-rate char–manure mix or manure application could replace 314 kg N ha−1 and 90 kg P2O5 ha−1 over 2 years without any yield penalty. This study underscores the synergy between char and manure or chemical fertilizers to improve nutrient balance and supply, ultimately enhancing crop production.

Abstract Image

在美国高原半干旱地区的牛栏中施用煤炭,促进可持续农业发展
在牛栏中添加高碳(C)添加剂并在土地上施用由此产生的混合粪便为优化粪便和土壤管理、同时减轻环境问题提供了一种潜在的策略。2019 年至 2022 年在内布拉斯加州西部进行了一项实验,以评估添加煤炭(按重量计为 290 克 C kg-1)对饲养场粪便性质和稳定性的影响,以及粪炭对玉米(Zea mays L.)-干豆(Phaseolus vulgaris L.)-玉米轮作中作物产量的交互影响。作物田中的处理方法包括:施用或不施用炭(每公顷施用量分别为 34 和 68 毫克;低施用量和高施用量)粪肥的圈舍、施用或不施用 45 毫克炭(每公顷)的尿素(建议氮(N)施用量为 100%)以及对照。降雪后,在围栏中施用木炭可使围栏更加干燥。木炭的高比表面积和阳离子交换能力提高了土壤和粪肥的养分保持率。2020 年,100% 尿素-氮加木炭处理的玉米产量高于低比例木炭-粪肥混合处理或高比例粪肥处理。2021 年,高炭肥率处理的豆类产量有高于对照的趋势。2022 年,所有施肥处理的谷物产量都高于对照。一次性施用高比例炭肥混合物或粪肥可在两年内替代每公顷 314 千克氮和每公顷 90 千克 P2O5,而不会影响产量。这项研究强调了木炭与粪肥或化肥之间的协同作用,可改善养分平衡和供应,最终提高作物产量。
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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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