This study investigated the effects of harvest time during the growth season on yield, quality and regrowth of willow. An eight-year-old willow field was harvested in April 2017, and biomass was harvested either once during 2017 on five dates from 13 June to 27 October, harvested twice in June and October or not harvested in 2017. Biomass yield, nutrient uptake and silage quality were measured for 2017 harvests, and regrowth yield was measured in November 2018. Postponing harvest from June to October increased dry matter (DM) mass fraction from 17.4 to 42.8% and decreased the concentration of ash, N, P and K in DM with N decreasing from 33.3 to 9.7 g kg⁻¹. pH in willow silage decreased with the later harvest. DM yield increased from 1.1 to 5.8 Mg ha⁻¹ from June to September and decreased to 4.5 Mg ha⁻¹ in October, and two harvests in 2017 only yielded 2.2 Mg ha⁻¹ in total. The sum of DM yields in 2017 and 2018 were 11.4 Mg ha⁻¹ without harvest in 2017 and ranged between 5.2 and 9.8 Mg ha⁻¹ when harvested in 2017.

这项研究调查了生长季节收获时间对柳树产量，品质和再生长的影响。2017年4月收获了一个有八年历史的柳树田，生物量在6月13日至10月27日的5个日期的2017年收获一次，在6月和10月收获两次，或者在2017年不收获。生物量产量，养分吸收和吸收测量了2017年收获的青贮饲料质量，并于2018年11月测量了再生长产量。推迟6月至10月的收获将干物质（DM）的质量分数从17.4增加到42.8％，并使DM中的灰分，N，P和K浓度降低N从33.3降至9.7 g kg ^-1。随着收获的后期，青贮柳的pH值降低。DM产量从1.1 Mg ha ^-1增加到5.8 Mg ha ^-1从6月到9月，到10月降至4.5 Mg ha - ¹，2017年的两次收割仅总共产生2.2 Mg ha ^-1。2017年和2018年的DM产量总和为2017年未收获的11.4 Mg ha - ¹ ,2017年收获时在5.2至9.8 Mg ha ^-1之间。