Drought-resistant tetraploid success

31 Mar, 2016 04:00 PM
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Tim Kooloos in a pasture on Base AR37 on his Leongatha South dairy farm.
Base ryegrass was selected from drought survivors in Maryborough and Hamilton...
Tim Kooloos in a pasture on Base AR37 on his Leongatha South dairy farm.

With shorter rest periods from grazing and better growth in dry summers, PGG Wrightson Seeds Base perennial ryegrass with AR37 endophyte has been a real success story for Victorian farmer Tim Kooloos.

Mr Kooloos, who runs a dairy farm at Leongatha South, started growing Base AR37 two seasons ago as he wasn't happy with the persistence of other tetraploid ryegrasses on his red soils, which are particularly susceptible to dry summers.

"Base ryegrass was selected from drought survivors in Maryborough and Hamilton, which is a fair bit drier than Leongatha South, so I thought if it can survive there it could survive down here pretty well," he said.

"So I trialled it one year in two paddocks with an autumn renovation, direct-drilling on an existing paddock and it established really well with really dense tillering, and then the winter performance I've never seen that in a perennial ryegrass before."

While the growth rates of most perennial ryegrasses slowed down significantly during winter, Mr Kooloos said he was pleased to see that the Base AR37 was not just better than other perennials, it actually lifted the performance in his milk vat compared with his annual ryegrasses.

"I was really surprised by the Base performance ù during winter I normally give perennial ryegrass a 40-50 day rest period between grazings to allow it to grow out to needed dry matter requirements, whereas I found the Base product could do the same with just 35 days rest period in the middle of winter," he said.

With a heavier sowing rate of 35kg/ha, complemented by high rates of nitrogen to get an extra growth response, Mr Kooloos was happy with the establishment and persistence of the Base ryegrass and has seen no problems with his cows grazing the AR37 endophyte.

"We have had trouble using standard endophytes in the past, but I've had no problems with the cows handling AR37, it's the best endophyte we've used," he said.

"The beauty of it is we've just farmed through two of the wettest winters on record followed by two of the driest summers on record and that's brought in above average levels of pest pressure that we wouldn't normally see in Gippsland, including root aphid, and the Base AR37 product seems to be a level above resistance-wise to the other species we've got on the farm."

Article supplied by PGG Wrightson Seeds, website http://www.pggwrightsonseeds.com.au.

Wrightson Seeds

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