Fall Harvesting of Alfalfa in North Dakota Impacts Plant Density, Yield, and Nutritive Value

Marisol Berti, Robert Nudell, Dwain W. Meyer
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引用次数: 11

Abstract

Alfalfa (Medicago sativa L.) is often not harvested in North Dakota during the fall because producers fear the risk of winter-kill and stand reduction. The objective of this study was to determine the impact of a fall harvest on plant density, forage yield, and nutritive value of alfalfa. Two replicated experiments were planted and evaluated in Fargo, ND. Experiment 1 was conducted from 2004 to 2008 and Experiment 2 from 2007 to 2011. Treatments in the two experiments were either a 3-cut system with no fall harvest or a 4-cut system with a fall harvest. Analysis was conducted across experiments and years. In certain years, plant density was significantly reduced when alfalfa was harvested in the fall. The 4-cut system, which included a fall harvest, had significantly greater seasonal forage yield. The total seasonal forage yield for the 4-cut system was approximately 1.04 to 3.88 Mg/ha greater than that of the 3-cut system. However, including a fall harvest decreased forage yield in the first cut the following season. In general, a fall harvest of alfalfa increases seasonal forage yield without reducing stand persistence and overall forage nutritive value.

北达科他州秋收苜蓿影响植物密度、产量和营养价值
北达科他州的紫花苜蓿(Medicago sativa L.)通常在秋季不收获,因为生产者担心冬季被杀和林分减少的风险。本研究的目的是确定秋收对苜蓿植株密度、饲料产量和营养价值的影响。两个重复的实验种植和评估在法戈,ND。实验1于2004 - 2008年进行,实验2于2007 - 2011年进行。在两个试验中,处理要么是三期制,没有秋收,要么是四期制,有秋收。分析是在实验和年份之间进行的。在某些年份,当苜蓿在秋季收获时,植株密度显著降低。包括秋收在内的4次采收系统具有显著更高的季节性饲料产量。四截制的季节牧草总产量比三截制高约1.04 ~ 3.88 Mg/ hm2。然而,包括秋收在内,在下一季的第一次收割中饲料产量下降。一般来说,紫花苜蓿的秋收增加了季节性饲料产量,但不降低林分持久性和整体饲料营养价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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