This Herbage Update defines a more accurate harvest window for perennial ryegrass seed crops. Read more here.
Key Points:
- Greatest seed yield was obtained when crops were cut at seed moisture contents (SMC) between 55% and 41%.
- When SMC fell below 41% seed yield decreased by 25.2 kg/ha for every 1% drop in SMC.
- Reductions in seed yield were largely driven by harvest losses, which increased as SMC decreased.
- Harvest losses increased from 400 kg/ha at SMC levels above 50% to more than 1100 kg/ha at 29% SMC - equivalent to yield losses of up to 40%.
- Thousand seed weight increases as SMC decreased, reaching a plateau at approximately 33% SMC.
- Pre-cut irrigation did not significantly influence seed yield or harvest losses.