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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Feasibility of using FGD gypsum to conserve water and reduce erosion from an agricultural soil in Georgia.
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Feasibility of using FGD gypsum to conserve water and reduce erosion from an agricultural soil in Georgia.

机译：在乔治亚州使用烟气脱硫石膏节约用水并减少农业土壤侵蚀的可行性。

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摘要

Crop production in Georgia and the Southeastern U.S. can be limited by water. Highly-weathered, drought-prone soils are susceptible to runoff and erosion. Rainfall patterns generate runoff producing storms followed by extended periods of drought during the crop growing season. Thus, supplemental irrigation is often needed to sustain profitable crop production. Increased water retention and soil conservation would efficiently improve water use and reduce irrigation amounts/costs and sedimentation, and sustain productive farm land, thus improving producer's profit margin. Soil amendments, such as flue gas desulfurization (FGD) gypsum, have been shown to retain rainfall and/or irrigation water through increased infiltration while decreasing runoff (R) and sediment (E). Objectives were to quantify rainfall partitioning and sediment delivery improvements with surface applied FGD gypsum from an Ultisol managed to conventional till (CT) and to assess the feasibility of using FGD gypsum on agricultural land in southern Georgia. A field study (Faceville loamy sand, Typic Kandiudult) was established (2006, 2007) near Dawson, GA managed to CT, irrigated cotton (Gossypium hirsutum L.). FGD gypsum application rates evaluated were 0, 1.1, 2.2, 4.5, and 9 Mg ha-1. Gypsum treatments and simulated rainfall (50 mm h-1 for 1 h) were applied to 2-m wide x 3-m long field plots (n=3). Runoff and E were measured from each 6-m2 plot (slope=1%). FGD gypsum plots averaged 26% more infiltration (INF), 40% less R, 58% less E, 27% lower maximum R rates (Rmax), and 2 times lower maximum E rates (Emax) than control plots. Values of INF and water for crop use increased, and R, E, Rmax, and Emax decreased as FGD gypsum application rate increased. Values of INF, R, E, Rmax, and Emax for 9 Mg ha-1 plots were as much as 17% greater, 35% less, 1.9 times less, 35% less, and 1.9 times less than those from other FGD gypsum plots, respectively; and 40% greater, 40% less, 2.2 times less, 52% less, and 2.9 times less than those from control plots, respectively. Applying FGD gypsum to agricultural lands is a cost-effective management practice for producers in Georgia that beneficially impacts natural resource conservation, producer profit margins, and environmental quality. Agriculture in the Southeast provides a viable market for the electric power industry to convert disposal costs of FGD gypsum into a profitable commodity.
机译：佐治亚州和美国东南部的作物产量可能受到水的限制。高度风化，易干旱的土壤易于径流和侵蚀。降雨方式产生径流，引发暴风雨，随后在农作物生长季节出现干旱。因此，经常需要补充灌溉来维持可盈利的作物生产。增加保水量和水土保持将有效地改善水的利用，减少灌溉量/成本和沉积，并维持生产性耕地，从而提高生产者的利润率。研究表明，土壤改良剂（例如烟道气脱硫（FGD）石膏）可通过增加渗透力来保持降雨和/或灌溉水，同时减少径流（ R ）和沉积物（ E ）。目的是量化从表面处理的FGD石膏（从管理到常规耕作（CT）的地面施用的FGD石膏）的降雨分配和泥沙输送的改善，并评估在乔治亚州南部的农业土地上使用FGD石膏的可行性。在佐治亚州道森市附近进行了田间研究（Faceville质壤沙，Typic Kandiudult）（2006年，2007年），成功地对CT（灌溉棉）进行了CT灌溉。烟气脱硫石膏的施用量分别为0、1.1、2.2、4.5和9 Mg ha -1 。将石膏处理和模拟降雨（50 mm h -1 进行1小时）应用于2 m宽x 3 m长的田地图（ n = 3）。从每6米 2 图（坡度= 1％）中测量径流和 E 。 FGD石膏地块的平均入渗（INF）平均增加26％， R 减少40％， E 减少58％，最大 R 降低27％（ R max ），并且最大 E 最高速率（ E max ）降低了2倍比控制地块用于作物的INF和水的值增加，并且 R ， E ， R max 和 E max 随FGD石膏施用量的增加而降低。 INF， R ， E ， R max 和 E 地块的> max 分别比其他FGD石膏高出17％，少35％，少1.9倍，少35％和1.9倍地块分别比对照样地多40％，少40％，少2.2倍，少52％和2.9倍。对于乔治亚州的生产者而言，将烟气脱硫石膏施用到农田是一种经济有效的管理方式，对自然资源保护，生产者的利润率和环境质量产生有益的影响。东南部的农业为电力行业提供了一个可行的市场，可将烟气脱硫石膏的处置成本转换为可盈利的商品。

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