Protecting a wet crop
By Alberta Agriculture and Forestry
With the continued difficulties in getting the crop harvested this fall, an Alberta Agriculture and Forestry (AF) specialist is recommending producers get their crops any way they can, as long as it goes through the combine.
“This year’s harvest has been a long, drawn out affair, filled with frustration and disappointment,” said Harry Brook, crop specialist, AF, in a press release. “Many producers still have crop left to be harvested or are taking it off wet, with grain being binned or bagged or piled at unheard of moisture levels. These crops cannot be left out in the cold for extended periods of time unattended.”
Once the crop is harvested and in storage, the excess moisture must be dealt with as soon as possible. “If you don’t have ready access to a grain dryer or have aeration for your bins, you must closely monitor the grain or oilseed for signs of heating. If you see signs that there is heating, you will need to cool the grain by circulating the grain out of and back into the bin. Depending on bin or pile size, this may have to be done fairly frequently.”
Brook has a caution for producers who are using grain bags for short term storage. “Remember that very damp or wet grain in a bag will start to mould. Some moulds will grow at cold temperatures and losses can be high. If bags are used for wet grain storage it should only be short term until crop drying occurs and close monitoring can again begin.”
When drying grain, there are maximum temperatures that should be used on the various crops. “There are tables that outline the maximum temperatures to be used to dry grain. Don’t exceed those maximum drying temperatures to avoid quality losses. With a large amount of moisture to be removed or a big seed, multiple passes of drying and cooling will be needed. In large seed like fababeans, drying might take three or four cycles to bring it down to safe storage levels. The cooling is required to let the moisture content in the seed equalize.”
If there is aeration, some supplemental heat can be used to help dry down the crop. However, Brook said, in this case smaller bins will be more useful than large bins. “To make this work, the fan has to have sufficient air flow to provide at least 0.5 cfm/bushel before adding the supplemental heat. Success will depend on the cleanliness of the grain and, even then, a load or two will have to be circulated out of the bin and back in to help equalize moistures and prevent dry and wet channels in the grain.”
Brook recommends restricting the air temperature increase to 10 C or less as higher temperatures can reduce efficiency and increase the chances of over-drying. For every 10 C increase in air temperature, the relative humidity is halved.
“If you have crop that is damp or wet, monitor it closely for signs of heating and, if it occurs, take the appropriate measures to retain the value of the crop. It is too costly to do otherwise.”