From the Field Updates: July 3, 2019
Another day, another rainstorm over here in Rock and Green county. As we enter July with thunderstorms on the forecast for almost everyday for the next 10 days. The past week we have been seeing scattered thunderstorms with some severe storms but have been fortunate to find dry ground here and there. This has been a challenging year to make applications to say the least, thank you for being patient when waiting for Landmark to make an application and be sure to let your agronomist know if you think your ground is fit to go.
On the bright side corn is starting to get a strong foundation and is now in its rapid growth stage. The plant is rapidly taking up nutrients, so this is a good time to scout fields and look for deficiencies. The most common visual deficiency we are seeing in corn so far this year is sulfur. Sulfur is not easily moved through the plant, so symptoms of interveinal chlorosis and yellowing will be most pronounced in the uppermost leaves. Sulfur is key in plant nutrition having many different roles within the plant, it is crucial for good yields and cannot be overlooked.
Soybeans are continuing to get growth on them as they continue nodulation and greening up. The biggest challenge we are having so far this year in soybeans is weed control and will continue as tough broadleaves continue to pop up. Make sure your soybean post program is up to par, to control what weeds are growing in the field. In alfalfa we are seeing high counts of leafhoppers and alfalfa weevil. After second cutting your hay needs to be monitored because if you start seeing insect damage you are too late.
With all of the heat and humidity, this last week corn has been growing like crazy. With most of the area behind last year and the average in GDD, this is very helpful for keeping the corn on the right track. But, corn and beans are the only thing growing out there. Weeds like the this weather just as much as the other two. Now is a great time to get a second pass application on your corns and beans. And with that second pass on beans don’t be afraid to add some more residual to help control waterhemp.
It rained again. 2-3 inches accumulated this past week. Temperatures have warmed up into the 80’s F this week, so the corn is growing fast. 6-8 leaf stage is common in many fields, and the canopy is covering. So, the second pass herbicide applications on corn may come to an end.
The combination of early planting, delayed planting, constant wet soil conditions and continued rain have also made it necessary to change approach on nitrogen applications from pre-plant to post plant, top dressing and side dressing this week.
Soybean stands look good, though development will be slow now. After June 21, solstice, the day and night length shifts. This causes soybeans to move more quickly into the podding, or reproductive phase, and plants put less energy into vegetative growth. This results in shorter plants, and uncertain yields at harvest. The window of time for post herbicide applications is wide open for controlling weeds, and may be important, with the reduction in bean canopy, to continue spraying to control problem weeds all summer. This is a good chance to add foliar boost products to the tank mix for soybeans.
Insect populations are low, and the pressure on crops is minimal. Though it is important to scout hay fields for leafhoppers, which left unattended, will reduce yields. Hay making is still a challenge during wet weather.