首页> 外文期刊>HortScience >Establishment and survival of endophyte-infected and uninfected tall fescue and perennial ryegrass overseeded into existing Kentucky bluegrass lawns in northeastern North America.
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Establishment and survival of endophyte-infected and uninfected tall fescue and perennial ryegrass overseeded into existing Kentucky bluegrass lawns in northeastern North America.

机译:内生植物感染和未感染的高羊茅和多年生黑麦草的建立和存活都覆盖在北美东北部现有的肯塔基州蓝草草坪上。

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Overseeding of tall fescue and perennial ryegrass into pre-existing stands of kentucky bluegrass is viewed as a strategy to enhance the quality and durability of turfgrass lawns. In a 3-year study, the authors investigated the winter survival and establishment of tall fescue ('Bonsai 2000'), with or without Neotyphodium coenophialum, and perennial ryegrass ('Palmer III'), with or without N. lolii, in the province of Quebec, Canada (~lat., 54 degrees N), a region characterized by rigorous winter conditions. Grass species were overseeded in June 2003 at two different rates (90 and 180 kg.ha-1), in experimental plots from two bioclimatological conditions: Quebec City and Boucherville. Turfgrass establishment and endophyte infection were evaluated during the following two spring and fall periods. Both tall fescue and perennial ryegrass had the capacity to establish and survive winter conditions, but performed best when snow cover was thick and present throughout the winter. The proportion of overseeded plants in the turfgrass stand rarely reached 30% over the years. Although the proportion of tall fescue and perennial ryegrass plants was much reduced in the spring, some tillers survived and were able, later in the season, to compete with kentucky bluegrass as tall fescue and perennial ryegrass populations returned to initial establishment populations each summer in mixed stands. Overwinter endophyte survival was species specific, with N. lolii being able to survive the cold winter but not N. coenophialum, which had a low percent of infection. For the perennial ryegrass-N. lolii association, competition with kentucky bluegrass is a primary factor limiting the increase over time in the proportion of endophyte-infected plants in a turfgrass mixture. Seeding rates did not influence the establishment of either grass species..
机译:将高羊茅和多年生黑麦草混入肯塔基州早已存在的林分中被认为是提高草皮草坪质量和耐用性的一种策略。在一项为期3年的研究中,作者调查了有或没有新tytyphodium coenophialum的高羊茅('Bonsai 2000')和有或没有萝莉猪笼草的多年生黑麦草('Palmer III')的冬季存活和建立。加拿大魁北克省(〜北纬54度),该地区的冬季条件严峻。 2003年6月,在魁北克市和布赫维尔这两种生物气候条件下的试验田中,草种以两种不同的比率(90和180 kg.ha-1)过量播种。在接下来的两个春季和秋季期间,对草皮草的建立和内生菌感染进行了评估。高羊茅和多年生黑麦草都有能力建立和生存冬季条件,但当积雪很厚且整个冬季都存在时表现最佳。这些年来,草皮草中超种子植物的比例很少达到30%。尽管春季高脚羊茅和多年生黑麦草的比例大大减少,但仍有部分耕种得以幸存,并且能够在本季节晚些时候与肯塔基州蓝草竞争,因为每年夏季夏季高脚羊茅和多年生黑麦草的种群在最初的种群中混合返回站立。越冬内生菌的存活是特定于物种的,萝莉猪笼草能够在寒冷的冬天生存,而纳豆猪笼草则不能,因为后者感染率很低。对于多年生黑麦草-N。萝莉协会,与肯塔基草的竞争是限制草皮草混合物中被内生植物感染的植物比例随时间增加的主要因素。播种率不影响任何一种草的建立。

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