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Nitrogen fertilization in tall fescue: Productivity, agronomic efficiency and relative profitability
Grassland Science ( IF 1.3 ) Pub Date : 2019-12-01 , DOI: 10.1111/grs.12261
M. Anowarul Islam 1 , Albert T. Adjesiwor 1
Affiliation  

Tall fescue (Schedonorus arundinaceus [Schreb.] Dumort.) is a perennial forage grass with good nutritive value and has the potential to be grown in many parts of the world. Field experiments were conducted over a 3‐year period (2010–2012) at two locations [University of Wyoming Powell Research and Extension Center (PREC) and a producer field (Stroh farm) in Powell, Wyoming] to evaluate forage accumulation, forage nutritive value, agronomic efficiency (AE) and relative profitability (RP) of using different cultivars or lines and nitrogen (N) rates in tall fescue production systems. The study design was factorially arranged in a randomized complete block with four replications at PREC and three replications at Stroh farm. Treatments comprised seven tall fescue cultivars ('97TF584,' 'Cowgirl,' 'Fawn,' 'Kentucky‐31,' 'Maximize,' 'Soft,' and 'Texoma') and three N rates (0, 56 and 112 kg/ha). There was a linear response (p = .02) of annual forage accumulation to year × N. Crude protein, in vitro dry matter (DM) digestibility, acid detergent fiber and neutral detergent fiber ranged from 90 to 102, 704–719, 360–383 and 555–581 g/kg, respectively. There were main effects (p < .01) of year, cultivar and N rate on AE and RP. Kentucky‐31 had the highest AE (53 kg DM/kg N), and AE was greater in the 56 kg N/ha (48 kg DM/kg N) compared to the 112 kg N/ha (39 kg DM/kg N). However, RP (where RP greater than 1 means revenue from N application is greater than the 0 kg N/ha treatment) was greater in the 112 kg N/ha (2.44) compared to the 56 kg N/ha (1.93). Among the cultivars, Kentucky‐31 had the highest RP of 2.56. Overall, all cultivars were responsive to added N and showed potential to be profitable under grass hay production systems.

中文翻译:

高羊茅的氮肥:生产力,农艺效率和相对盈利

高羊茅(Schedonorus arundinaceus[Schreb。] Dumort。)是一种多年生牧草,具有良好的营养价值,并有可能在世界许多地方种植。在两个地方[怀俄明州鲍威尔大学研究与推广中心(PREC)和怀俄明州鲍威尔的生产者田间(Stroh农场)]进行了为期3年(2010-2012年)的田间试验,以评估饲料的积累,饲料的营养高羊茅生产系统中使用不同品种或品系的氮肥价值,农艺效率(AE)和相对收益率(RP)。该研究设计按因子分解排列在一个随机的完整区块中,在PREC进行四次重复,在Stroh农场进行三次重复。处理包括七个高羊茅品种(“ 97TF584”,“女牛仔”,“小鹿”,“肯塔基州31”,“最大化”,“柔和” 和“ Texoma”)和三个氮肥(0、56和112 kg / ha)。线性响应(p  = .02)至每年×N的年牧草积累量。粗蛋白,体外干物质(DM)消化率,酸性洗涤剂纤维和中性洗涤剂纤维的范围为90至102、704–719、360–383和555–581 g / kg。有主要影响(p <.01)年,AE和RP的品种和N比率。肯塔基州31的AE最高(53 kg DM / kg N),相比于112 kg N / ha(39 kg DM / kg N),AE在56 kg N / ha(48 kg DM / kg N)中更大)。但是,相对于56千克氮/公顷(1.93),RP(112千克氮/公顷(2.44)中的RP(其中RP大于1意味着来自施氮的收益大于0千克氮/公顷))。在品种中,Kentucky-31的最高RP为2.56。总体而言,所有品种对添加的氮都有反应,并显示出在干草生产系统下潜在的获利潜力。
更新日期:2019-12-01
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