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Nutrient excretion from cattle grazing nitrogen-fertilized grass or grass–legume pastures
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-04-14 , DOI: 10.1002/agj2.20675
Liza Garcia 1 , José C. B. Dubeux 1 , Lynn E. Sollenberger 2 , Joao M. B. Vendramini 3 , Nicolas DiLorenzo 1 , Erick R. S. Santos 1 , David M. Jaramillo 4 , Martin Ruiz‐Moreno 1
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Nutrient cycling via livestock excreta is an important grassland ecosystem service. This study was conducted in 2016 and 2017 and determined nutrient excretion from cattle grazing three systems: (a) N-fertilized bahiagrass (Paspalum notatum Flüggé) overseeded with rye (Secale cereale L.) and oat (Avena sativa L.) during winter (Grass+N), (b) unfertilized bahiagrass overseeded with rye–oat–clover (Trifolium sp.) mixture (Grass+clover), and (c) rhizoma peanut (Arachis glabrata Benth.)–bahiagrass mixture overseeded with a rye–oat–clover mixture (Grass+CL+RP). Urinary volume excreted in the warm season ranged from 122 to 182 L ha−1d−1, more than double that in the cool season (56–70 L ha−1 d−1). Urinary N concentration during the warm season was greater in Grass+CL+RP compared with Grass+N (4.4 vs. 3.1 g kg−1, respectively). In addition, fecal dry matter and organic matter output was greater for Grass+N than for steers grazing Grass+CL+RP during the warm season (3.8 and 3.2 vs. 2.8 and 2.2 kg hd−1 d−1, respectively). Total annual feces excretion concentrations of P, K, Mg, and N were greater in the Grass+N than in Grass+CL+RP system. The introduction of legumes increased the proportion of N returning via urine. However, when summed across seasons, total N excretion (feces and urine) was greater in Grass+N than in Grass+CL+RP (89 vs. 71 kg ha−1 yr−1), mainly due to the greater stocking rate in the former. Grass–legume systems receiving 34 kg N ha−1 yr−1 recycled 80% of the N recycled in the grass system receiving 224 kg N ha−1 yr−1, indicating the potential of forage legumes to add N to grasslands.

中文翻译:

放牧氮肥草或豆科牧草的牛的营养排泄

通过牲畜排泄物进行的养分循环是一种重要的草地生态系统服务。该研究于 2016 年和 2017 年进行,确定了牛放牧三个系统的养分排泄:(a) 施氮肥巴伊亚草 ( Paspalum notatum Flüggé ) 在冬季与黑麦 ( Secale policee L.) 和燕麦 ( Avena sativa L.)交割( Grass+N)、(b) 用黑麦-燕麦-三叶草 ( Trifolium sp.) 混合物(草+三叶草)和 (c) 根状花生(Arachis glabrata Benth.)-用黑麦-燕麦播种的巴伊亚草混合物–三叶草混合物(草+CL+RP)。暖季排尿量为 122 至 182 L ha -1 d -1,是凉爽季节(56-70 L ha -1 d -1)的两倍多。与 Grass+N 相比,Grass+CL+RP 中暖季的尿液 N 浓度更高(分别为4.4 和 3.1 g kg -1)。此外,在温暖的季节,Grass+N 的粪便干物质和有机质输出高于 Grass+CL+RP 放牧的公牛(3.8 和 3.2 vs. 2.8 和 2.2 kg hd -1 d -1,分别)。Grass+N 系统中 P、K、Mg 和 N 的年粪便总排泄浓度高于 Grass+CL+RP 系统。豆类的引入增加了通过尿液返回的氮的比例。然而,当跨季节求和时,Grass+N 中的总氮排泄量(粪便和尿液)比 Grass+CL+RP(89 对 71 kg ha -1  yr -1)更大,主要是由于更高的放养率前者。接受 34 kg N ha -1  yr -1 的草-豆科植物系统回收了 80% 接受 224 kg N ha -1  yr -1的草系统中回收的氮,这表明豆科牧草向草原添加氮的潜力。
更新日期:2021-04-14
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