Dry Matter When Making Summer Annual Silage and How to Measuring Its Dry Matter (or Moisture)

 

To make good silage from summer annuals such as sorghum, sudangrass, and pearl millet, the dry matter concentration should be between about 30% to 40% (moisture contents of 60 to 70%). Silage made wetter can seep which causes a loss of nutrients and potential environmental damage if the seepage gets into surface water (fish kill). Silage made drier will not pack adequately and may heat during storage. In some situations, heat generation can be great enough to start a fire within the silage mass. The drier the silage, the greater the risk for a silo fire. In addition to DM, chopping length of particle size of the chopped forage affects heating risk. Coarsely chopped silage does not pack as well as finely chopped silage, but silage chopped too finely can cause rumen upsets when fed to cattle. Choppers differ but setting the theoretical length of cut (TLC) at about 3/8 to ½ of inch will usually produce the correct particle size. Chop length needs to be reduced as the DM at chopping increases.

 

 

1. Obtain a good sample. The dry matter of leaves will be much greater than that of the stems and the lower portion of the stem will be wetter than the top. The sample must include the total plant that will be chopped. Go into the field (not outside rows) and hand cut 5 to 10 plants at the same height that the crop will be mowed. Chop all the plants using a wood chipper, forage chopper, or by hand.

 

2. Mixed the chopped sample well.

 

3. Measure dry matter using one of the methods below.

 

 

Follow manufacturer directions, but basically you need to accurately weigh out about  200 grams (0.5 lbs.) into the drying container. Record the weight. Dry for about 20 minutes and re-weigh and record the weight. Dry another 5 minutes and weigh again. If weight is the same as the 20 minute weight, the sample is dry. If not, repeat drying in 2 or 3 minute intervals until weight is constant.  Calculate DM% as (Starting weight – Ending weight)/Starting weight x100. Moisture = 100 - DM%.

 

 

Accurately weigh about 100 grams (0.2 lbs) of chopped forage on a paper plate. Record the weight. Spread it out thinly. Fill a microwave safe mug about half full with water. Put plate and mug into a microwave. Heat on full power for 2 minutes, remove plate, weigh, record the weight and stir the forage. Heat for another 30 seconds, remove, weigh, stir, and record weight. Repeat the 30 second cycle until weight stabilizes. Watch carefully because it can catch fire. It usually takes about 4-6 minutes.  Calculate DM% as (Starting weight – Ending weight)/Starting weight x100. Moisture = 100 – DM%.

Video: Winter Canola Trial in Mississippi | Can It Work for Double Cropping? | Pioneer Agronomy

Can winter canola open new opportunities for growers in the Mid-South? In this agronomy update from Noxubee County, Mississippi, Pioneer agronomist Gus Eifling shares an early look at a first-year winter canola trial and what farmers are learning from the field.

Planted in late October on 30-inch rows, the crop is now entering the bloom stage and progressing quickly. In this video, we walk through current field conditions, fertility management, and how timing could make this crop a valuable option for double-cropping soybeans or cotton.

If harvest timing lines up with early May, growers may be able to transition directly into another crop during ideal planting windows. Ongoing field trials will help determine whether canola could become a viable rotational option for the region.

Watch for:

How winter canola is performing in its first season in this Mississippi field

Why growers chose 30-inch rows for this trial

What the crop looks like as it moves from bolting into bloom

Fertility strategy, including nitrogen and sulfur applications

How canola harvest timing could enable double-cropping with soybeans or cotton

Upcoming trials comparing soybeans after canola vs. traditional planting

As more growers look for ways to maximize acres and diversify rotations, experiments like this help determine what new crops might fit into existing systems.