Calcethorpe Updates Late May 2017
The Effects of Cover Crop Termination Timing: Published Late May 2017
This was not seen in the mixes and those sprayed off with a 4-6 weeks gap before spring cereal drilling. This is looking the best piece of spring barley at the site so far.
They are as follows;
High C:N ration cover crop areas – 0.16 GAI
Low C:N ratio cover crop areas – 0.99 GAI
Mixes sprayed odd 4-6 weeks before drilling – 1.35GAI
The lower C:N ratio plots and the ex-mixes had at least 1 extra tiller per plant in comparison to the high C:N plots. They also had much fewer weeds in them due to increased crop competition.
The Effects of Cover Crop Termination Timing on the Following Crop Establishment
We have performed a soil health survey on the 2 sections of the field (high and low C:N ratio) to see the difference the crop can make in the soil. As you can see from the photos, the crop following the low C:N ratio cover crop has a much more pleasing aggregation to that following a high C:N ratio cover crop. This is purely down to rooting mass differences from the barley crop between the 2 plots in this case.
The soil following the low C:N ratio had also dealt with the recent heavy rainfall much better, this is due to the aggregates being much smaller and therefore the soil having a much larger surface area to absorb the excess moisture. This had also meant less excess rainfall had been lost to the subsoil keeping the soil much more moist and warmer when compared to the soil following the low C:N ratio cover crop.
The Effects of the Growing Crop on the Soil Structure