First year cover crop experience

Way back in September 2017 we tried some cover crops on fields that were scheduled to be planted to either corn or grain sorghum. On some fields we planted a blend of rye, triticale, winter barley, turnips, radishes and a rapeseed with intentions of grazing cattle on it in the fall. We also had some fields with rye. Normally grain sorghum is planted in early June in fields that had wheat harvested off of them the end of the previous June. We try to rotate sunflowers through between wheat and corn/grain sorghum every 8 years so.

This field was the grazing blend that wasn’t grazed due to dry weather the prevented proper fall growth. I had switched from a yellow variety to a red sorghum variety. The weed control has been very good here. The rain and weather aligned with sorghum needs very well and it’s tough crop that is still suited for poor hill ground compared to corn.

We had the same grazing blend here that was grazed. It was only grazed for about 3 weeks because it was dry and didn’t grow as expected. I also planted the covers about a notch shallower than I normally plant wheat I didn’t want to bury the radishes and turnips. I think I would have been better at the deeper seed depth. We have a little more weed pressure, not bad and the favorable weather we can grow good sorghum and weeds.

For comparison this sorghum was planted into wheat stubble that had double crop sunflowers last year, the sunflowers had done very good last year. We like the sunflowers as a double crop for many reasons. We can plant them as late as July 20th and make a crop, they are harvested high off the ground so our wheat stubble remains in tact on the field. Finally the tap root goes deep in the soil and extracts nutrients other crops can’t reach, the deep roots serve as a pathway for following crops to root deeper. It seems crops following for the next 3 or 4 years just do a little better. We have an irrigated field that has had a corn, soybean, wheat and double crop sunflower rotation for years. I’d love to have a soil pit on it some time, I imagine there is black streaks several feet deep  every few inches.

The corn is already harvested where we we have had cover crops. Very good weed suppression and it still has a nice mat of residue on the ground from both the wheat stubble and rye. The corn yields weren’t great due to hot dry weather at pollination. One field has been seeded back to wheat. The other field some of the corn was chopped for silage in early august and the rest was harvested for grain mid September. It has been seeded back to rye and planning to put soybeans on it next spring.

The cereals were sprayed out when they reached the boot stage so we shouldn’t have a problem with making seed and future plants becoming weeds. The plants were at max growth in regards to size and weren’t using nutrients and soil water to make seed yet.

We were a little leary of planting sorghum on the covers because there are little effective herbicide options for weed control after the crop starts growing and unsure of how well our normal pre plant residual herbicides would be with all the residue. We decided to use the pre plant due to thin places in the cover crops to prevent an explosion of weeds there. Corn is a better option because of better herbicide options even for non GMO varieties.

Here is a field planted to rye. It might get grazed later this fall if things work out for us to we used a basic stater fertilizer to help maintain the phosphorus level in the soil. There is another field, the dry land portion of the irrigatated corn, soybean, wheat, double crop sunflower field that has some rye on part of it. It will be interesting to see how and if soybeans respond to the rye cover crop. 

In the future I might experiment with winter legumes such as winter peas and chickling vertch on fields destined for corn or grain sorghum, I don’t think we will have the ground cover we have with cereal crops hindering soil water holding. A mix of them with cereal and turnips might work well. Another consideration is neighboring wheat fields, volunteer wheat can harbor mosaic and cause problems. If we know there is a will be a wheat field next to it, even across the road we plant later after controlling the volunteer wheat. Later planting limits the cover crop choices.