Farmwest Blog

JUNE Update to Manure Spreading Advisory #1 of 2017: South Coast Region

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 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.

March UPDATE to Manure Spreading Advisory #4 of 2016: South Coast Region

Refer to Manure Spreading Advisory #4 of 2016 (November 7, 2016) for the current Advisory: “in general, manure application on any crops is not advised.” Soils remain wet throughout the Fraser Valley. Manure application on wet or frozen ground followed by significant precipitation would present a very high risk of pollution occurring from runoff. The continued cold weather in the Fraser Valley means established grass fields will take longer than previous years to benefit from manure spreading. Watch the T-Sum, a sum of daily mean temperatures above 0°C, for your area increase at The T-Sum is one factor used to determine appropriate timing for the first manure application on grass fields. More importantly, however, decisions about the first manure application should consider the overall risks of runoff from the field, not just the state of the grasses. On some but not all fields, conditions will be suitable for manure application before T-Sum reaches 200. On other fields, conditions will not be suitable even after T-Sum reaches 200 (e.g. if fields are still saturated from rains).