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West Otago sheep and beef farmer Simon O’Meara.
While winter feed crops are crucial in Simon O’Meara’s farm system, the West Otago sheep and beef farmer is making changes to cut their damage to the environment.
Poorly managed winter feed crops harm the environment, he says, and that requires a change of mindset.
“We are used to having our paddocks look like golf courses, but we have to get away from that.”
O’Meara has taken onboard the findings of P21 Project trial work at Telford Research Farm that showed that the protection of ‘critical source areas’ (CSAs) and strategic grazing management can reduce soil and P losses by 80-90%.
This might mean having long rank grass around CSAs -- not aesthetically pleasing but raising water quality for the whole catchment.
O’Meara farms 565ha of rolling country at Wilden behind Heriot, running 3000 ewes, 800 hoggets and 250 cattle. Like many sheep and beef farms in the area, 5-10 % of his farm is in winter feeds crops -- kale, swede and fodder beet.
O’Meara is in the Pomahaka Water Care Group, learning of the main contributors to water quality issues in the Pomohaka catchment. He is now working to minimise sediment and phosphate losses caused during soil movement on his farm over winter.
He starts this process at crop establishment by selecting paddocks to suit the stock class. Dry, rocky paddocks suit winter feed crops that will be grazed by cattle, while sheep can be wintered on heavier soils.
“The heavier the stock class the drier the paddock,” he says.
He has also identified parts of his farm that no longer suit winter feed crops.
He will renew pastures on these areas in a straight grass-to-grass rotation, minimising soil disturbance and sediment and phosphate losses.
When establishing a winter feed crop (spraying, cultivating and drilling), he or his contractor will identify where the ‘critical source areas’ (CSA) are. These include hollows, swales or wet areas in the paddock, to be left in grass, fenced off and grazed last after the crop has been eaten.
In winter, he begins grazing the crop from the top of the paddock so any soil and water flowing downhill is filtered through the crop.
Where hollows at the bottom of paddocks feed directly into waterways, he will build a bund or sediment trap that can be cleaned out over summer.
This also means he will remove cattle from feed crops in bad weather and run them on a dry pasture paddock, but he will also back-fence to prevent cattle pugging the grazed areas.
Recent widespread autumn rain will have triggered the germination of subterranean clover seeds, and the resulting seedlings should be allowed to reach the 3–4 trifoliate leaf stage before grazing, says Beef+Lamb NZ.
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