A. Subedi, D. Franklin, Miguel Cabrera, Natalia Espinoza, N. Gaur, Dee Pederson, Lawton Stewart, Chad Westmoreland
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An analysis of variance indicated that below 5 cm BL pastures had significantly greater amounts of NO3−, IN, PMN, and soil pH compared to Min pastures. Comparisons of drainage classes (well drained~WD, moderately well drained~MWD, and somewhat-poorly drained~SPD) for each BL and Min were analyzed using linear regression for C:IN, C:PMN, pH: NO3−, and pH: NH4+ with all depths combined. In MWD soils, BL had 0.1 and 0.2 mg N kg−1 greater PMN and IN, respectively, for each unit increase in C. In WD soils NO3− decreased in BL by 7.4 and in Min by 12.1 mg N kg−1, while in MWD soils, this level decreased in BL by 7.8 and in Min by 4.5 mg N kg−1 for each pH unit. Five years after N fertilization stopped, BL soils have retained more inorganic N but are losing more NO3− at a greater rate in the MWD soils when all depths are considered. These losses are a combination of plant uptake, emissions, runoff and leaching. While more research is needed, these results strongly suggest the need to design N fertilization practices with drainage class and fertilization legacy in mind to improve N-use efficiency.","PeriodicalId":21908,"journal":{"name":"Soil Systems","volume":null,"pages":null},"PeriodicalIF":2.9000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Vertical Distribution of Carbon and Nitrogen in Pastures Fertilized with Broiler Litter or Mineral Fertilizer with Two Drainage Classes\",\"authors\":\"A. Subedi, D. Franklin, Miguel Cabrera, Natalia Espinoza, N. Gaur, Dee Pederson, Lawton Stewart, Chad Westmoreland\",\"doi\":\"10.3390/soilsystems8030085\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Nitrogen cycling in pasture soils differing in drainage characteristics and fertilization legacy needs more research to determine efficient nutrient management strategies. 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引用次数: 0
摘要
需要对排水特性和施肥传统不同的牧场土壤中的氮循环进行更多研究,以确定高效的养分管理策略。本研究比较了佐治亚州伊顿顿 10 个 0.7 公顷牧场中硝酸盐 (NO3-)、铵 (NH4+)、无机氮 (IN = NO3- + NH4+)、潜在矿化氮 (PMN)、点火损失碳 (C) 和土壤 pH 值的差异。我们在 20 米网格上取样至 90 厘米(0-5、5-10、10-20、20-40、40-60 和 60-90 厘米)。方差分析表明,5 厘米以下 BL 型牧场的 NO3-、IN、PMN 和土壤 pH 值明显高于 Min 型牧场。采用线性回归法分析了C:IN、C:PMN、pH:NO3-和 pH:NH4+ 的线性回归分析。在 MWD 土壤中,C 每增加一个单位,BL 的 PMN 和 IN 分别增加 0.1 和 0.2 毫克 N kg-1。在 WD 土壤中,NO3- 在 BL 中减少 7.4 毫克 N kg-1,在 Min 中减少 12.1 毫克 N kg-1,而在 MWD 土壤中,每增加一个 pH 单位,NO3- 在 BL 中减少 7.8 毫克 N kg-1,在 Min 中减少 4.5 毫克 N kg-1。氮肥施用停止五年后,BL 土壤保留了更多的无机氮,但考虑到所有深度,MWD 土壤的 NO3- 流失率更高。这些损失是植物吸收、排放、径流和沥滤的综合结果。虽然还需要更多的研究,但这些结果有力地表明,在设计氮肥施用方法时,需要考虑排水等级和施肥遗留问题,以提高氮肥利用效率。
Vertical Distribution of Carbon and Nitrogen in Pastures Fertilized with Broiler Litter or Mineral Fertilizer with Two Drainage Classes
Nitrogen cycling in pasture soils differing in drainage characteristics and fertilization legacy needs more research to determine efficient nutrient management strategies. This study compared differences in nitrate (NO3−), ammonium (NH4+), inorganic N (IN = NO3− + NH4+), potentially mineralizable nitrogen (PMN), loss-on-ignition carbon (C), and soil pH in 10, 0.7 ha pastures in Eatonton, Georgia, historically fertilized with the same amount of N as either broiler litter (BL; >15 years, 6 pastures) or mineral fertilizer (Min; 4 pastures). We sampled to 90 cm (0–5, 5–10, 10–20, 20–40, 40–60, and 60–90 cm) on a 20 m grid. An analysis of variance indicated that below 5 cm BL pastures had significantly greater amounts of NO3−, IN, PMN, and soil pH compared to Min pastures. Comparisons of drainage classes (well drained~WD, moderately well drained~MWD, and somewhat-poorly drained~SPD) for each BL and Min were analyzed using linear regression for C:IN, C:PMN, pH: NO3−, and pH: NH4+ with all depths combined. In MWD soils, BL had 0.1 and 0.2 mg N kg−1 greater PMN and IN, respectively, for each unit increase in C. In WD soils NO3− decreased in BL by 7.4 and in Min by 12.1 mg N kg−1, while in MWD soils, this level decreased in BL by 7.8 and in Min by 4.5 mg N kg−1 for each pH unit. Five years after N fertilization stopped, BL soils have retained more inorganic N but are losing more NO3− at a greater rate in the MWD soils when all depths are considered. These losses are a combination of plant uptake, emissions, runoff and leaching. While more research is needed, these results strongly suggest the need to design N fertilization practices with drainage class and fertilization legacy in mind to improve N-use efficiency.