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Published
30 .Jul.2021

Raise mower for quality silage and better regrowth

DLF trials show the positive effects of raising cutting height

Cutting grass crops at 9cm rather than 6cm or 3cm, will give the highest quality silage and allow quicker regrowth, according to trials carried out at the DLF demonstration site in Didbrook, Gloucestershire.

Now in their second year, the yield, forage quality and persistence of six perennial ryegrass varieties are under investigation. 

Visual assessments two weeks after cutting clearly show the 3cm plots as still looking yellow and brown, the 6cm plots are just coming back to green and the 9cm plots green and growing back well.

Regrowth on the plots of late diploid perennial ryegrass Bowie two weeks after cutting (3cm left, 6cm centre, 9cm right).

“Cutting low will undoubtedly produce more silage in the clamp but the feed quality will be compromised. This is because there will be a lot of stem as well as leaf included,” says David Rhodes technical manager for DLF Seeds.

“Scalping grass plants will also mean they will struggle to photosynthesise because there are no green areas left to capture sunlight, so they will eventually die. Even cutting at 6cm will mean it takes longer for the crop to regrow for the next cut.

“For farmers using a contractor, it is really important to talk about cutting height before they arrive, as they might prefer to cut low to increase the tonnages they cut.”

Festulolium vs Perennial Ryegrass

A second trial at the Didbrook trials ground is comparing the performance of festuloliums – crosses which capitalise on the beneficial attributes of perennial ryegrasses and fescues, which afford deeper rooting and greater resilience in adverse conditions - and perennial ryegrasses.

“We have sown all of our festulolium types including Lofa, Perseus and Fojtan and compared them with the control perennial ryegrasses sown in the National List trials,” Mr Rhodes explains.

“We are collecting yield and feed quality data from plots that are cut to represent frequent grazing and silage cuts. 

“So far, across all plots the festuloliums have performed the best in this spring’s topsy turvey weather – with its dry April, unusually wet May and dry June. Deeper roots mean the festuloliums are recovering much quicker.

“This suggests that farmers should consider including more festuloliums into their mixtures for added resilience in the face of unpredictable weather in the future.”