Friday, July 31, 2009
Wednesday, July 29, 2009
Image 1: Yellow soybeans in this field are the result of sidewall compaction.
Image 2: Soybean roots restricted by sidewall compaction. Root growth is limited mostly to the furrow created during planting.
Image 3: Soybean roots restricted by compaction just beneath the soil surface. Root growth is bending to curve around the compaction. The overall root mass is reduced from the compaction.
Image 4: Soybean roots with little to no restriction. The whole plants are greener and larger. Root mass is greater and there are more nodules per plant.
Tuesday, July 28, 2009
This is typical for SA in Kentucky. Experience has shown me that when soybean aphid populations are detected they will most likely be found in the counties between I-65 and I-75. Also, this area generally has larger populations than found in the western production area. In addition the only SA populations that have approached threshold levels have occurred in these counties. Nevertheless, we do know that this pest is active state wide so no one should dismiss it out of hand.
Our history with this insect tells us that we are unlikely to need a treatment but insects are very adaptive, and local populations can vary from the norm. Keep an eye on them!
See Kentucky Pest News at: http://www.uky.edu/Ag/kpn/kpnhome.htm for the complete story.
Tuesday, July 21, 2009
Small soybeans or late-planted soybeans that do not reach full canopy by flowering probably have lost some yield potential. Cooler temperatures also reduce the chances of soybeans reaching full canopy by flowering. In hindsight, the best management practice would have been to plant in 7.5-inch rows. The narrow rows would have improved the chances of getting complete canopy closure by flowering. Foliar fertilizers and fungicides will not make up the difference in temperatures, planting date or row spacing.
Tuesday, July 14, 2009
Printed copies of both publications should be available within several weeks. Both of these publications are linked to the Grain Crops Extension Website at: http://www.uky.edu/Ag/GrainCrops/
Friday, July 10, 2009
I had a question on how the ACRE program will calculate the average yield per planted acre for Kentucky. The ACRE program will use yields provided by the National Agricultural Statistics Service (NASS). However, the calculation for yield per planted acre used by the Farm Service Agency (FSA) will be a little different than how NASS defines yield per planted acre. The FSA defined yield per planted acre as harvested acres plus failed acres. Failed acres are intended for harvest but not harvested. To then calculate yield, divide the state’s production by the harvested acres plus failed acres. With few failed acres in Kentucky this approach will not make much of a difference but a difference may be seen in the FSA calculated yield per planted acre and the published NASS yield per planted acre. The FSA yield per planted data will use come from both published and unpublished NASS data. You can reach Cory Walters at firstname.lastname@example.org