Date: June 1, 2017
Refer to Manure Spreading Advisory #1 of 2017 (April 3, 2017) for the current Advisory.
The following Update does not change the Advisory. Considerations for spreading manure during warm weather With the onset of warm weather around the South Coast of BC it is important to consider the impact of high temperatures on nitrogen (N) loss from manure. Volatilization of ammonia during and shortly after application is greatly increased when temperatures are high. Several other factors including manure composition, time to incorporation, wind, soil pH and moisture, and application method will impact ammonia loss as well. However, spreading manure when temperatures are above 25°C can result in a loss of 50% of the ammonia N within three hours of application.
To avoid losing the readily available ammonia N in your manure
- Apply during the cooler times of day and when wind speeds are low
- Incorporate the manure as soon as possible
Farmwest.com provides an Ammonia Loss From Manure calculator which can help predict the potential N loss during manure application. Losing ammonia from manure is a direct loss of its fertilizer value and should be considered when planning application timing and calculating manure’s contribution to crop N requirements.