28 September 2020
Good supply indications in Northern Ireland
INITIAL indications in Northern Ireland are that potato markets will be well supplied this season so crop quality will be very important in ensuring successful marketing of the crop.
Robin Bolton, senior crops development adviser at the College of Agriculture, Food and Rural Enterprise (CAFRE) in Northern Ireland said attention to detail will therefore be crucial.
"Harvester set-up is key to ensuring successful harvesting. Daily samples should be taken from the harvester and hot boxed to check for any signs of bruising," he said, stressing that if bruising is identified, further investigation can be carried out to determine the cause and settings can be adjusted to reduce the damage.
“The key areas to focus on are the following. Firstly, ensure wheel track and tyres are suitable for the drill and bed width to avoid compressing the drills. Then, align the share correctly to the primary web. Also, maintain a sufficient flow of soil up the primary web to ensure transfer of the potatoes onto the cleaning units," he said.
“Make sure that the haulm rollers are set correctly and set cleaning units to the least aggressive setting that will provide a sufficient removal of soil and debris while minimising damage to the crop.
“Moreover, don’t overfill boxes to avoid damage by forklift toes. Finally, keep the drop during the transfer from the harvester to the trailer or box to a minimum.”
Robin added that quick drying of the crop, preferably by positive ventilation systems, is also important, after which the crop needs to be allowed sufficient time for curing so any wounds caused during digging and grading can heal before the crop is cooled in store.
“Ideally, when ventilating the crop, the air used should be within 4° of the tuber temperature. If the air used to ventilate is too warm, condensation will occur which can increase skin disease on the crop," said Robin. "While the store is still being loaded, aim to keep the temperature of potatoes in the store within 3° of the potatoes being brought into the store and only once store loading is complete, can the final pull down of the crop to the target store temperature be completed.For this reason, it is best to plan harvesting to allow stores to be filled and sealed as quickly as possible.
“Finally, when stores are being loaded consideration should be given to when various lots of potatoes may be marketed so that they can be accessed when necessary. Crops should be monitored regularly throughout the storage period so that any issues can be dealt with quickly,” he concluded.