How can I avoid high nitrate levels at harvest?
The best way is to get your application rate right in the first place. However, prolonged periods of dry weather cannot be anticipated and can ruin even the best made plans. Remember that, after a prolonged dry spell, rain will cause rapid nitrogen uptake by the plants.
If high nitrates are suspected make sure you have a representative sample of the grass analysed. If the nitrate level is above 1,000 ppm (0.1%) you should not ensile. Wait a few days and analyse again.