Rain shines the light back on quality
Following recent rain grass has started to grow again in most areas. What is the best way to manage the grass growth? Grass 10 advisor John Douglas has advise on keeping the focus on quality.
For those farms where grass growth has improved, aim to graze covers 1200-1400KgDM/Ha. Remove supplementation when cover/LU is 160-180 KgDM/Cow or there are 12 days ahead. Focus back to getting as much grass into animals as possible. Farmers shouldn't "Build Grass" where growth has picked up but continue to walk and measure their farms to monitor growth and if it declines again - then hold the cover. Going beyond 200 KgDM/Cow (16 days ahead) will reduce quality of grass swards which are already stressed and, from talking to farmers, already struggling with quality.
In a lot of cases grass quality on farms has deteriorated due to present of seed heads and the grass wedge has been flattened due to a period of restricted growth. It is important to walk the farm twice this week following rain as higher than normal soil temperatures and fertiliser spread usually means a burst of growth.
Getting quality back into poor grass swards will require a few different approaches. It will take a couple of weeks or maybe a rotation to fully get back on track. Trying to do it too quickly will result in a further flattening of the wedge and reduced growth rates. So it is important to find a balance.
Here are a few suggestions. If growth is exceeding demand and cover/cow >180 kgDM/Ha (>14days) and you estimate it will continue then use this opportunity to remove the worst quality paddocks as surplus bales. This is the preferred option and should be done immediately to get quality grass back into rotation.
But we realise not everyone has the luxury of this. So graze covers 1000-1200 KgDM/Ha to 4cm. If struggling to graze to 4cm make sure you are not over allocating grass or feeding too much supplement. On a 36hr paddock use a strip-wire at the back of the paddock to save about 15% of the area which can be removed on the 3rd grazing to allow cows get some fresh grass which should encourage them to graze out the rest of the paddock to 4cm.
Poorest quality swards should be grazed as best they can to reach 4cm using techniques above and aim to remove as surplus bales in the next rotation. If possible it is a good idea to graze these paddocks in-situ with after-grass so animals are still getting some high quality forage into the diet.
Avoid pre-mowing and topping heavy covers this wastes grass and slows down the regrowth. More than likely if you have heavy covers, you have too much grass, aim to remove this surplus as silage bales.
Where a farm has experienced a period of low growth followed by a period of normal/high growth they may have a flat grass wedge. This means many of paddocks have a similar cover. Don’t be afraid to start grazing these paddocks at covers of 1,000 KgDM/Ha as within 3 – 4 days the pre-grazing yield will increase to 1,400 KgDM/Ha. Slowing the rotation and waiting until these covers reach 1,400 KgDM/Ha will only result in grazing a high pre-grazing yield which has more stem, is less digestible and harder to graze out.
Use the next few weeks to get back to grazing quality grass, improve animal performance and catch up. Walk the farm twice weekly and take the guess work out of managing and make decisions as soon as possible. Use the Predicted Wedge function on PastureBase to give you more confidence in your decisions. Also 1 unit N per acre per day should be applied to make the most of grass growth. (20u N/ac per rotation)