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JenREES 8/15/22

With every development stage this replant corn crop achieves, I’m grateful! Many fields will hopefully begin pollination soon. Late-planted crops can have quite a bit of disease and insect pressure develop late. Would encourage you to wait and treat fields when needed instead of automatically at beginning tassel.

Last irrigation: (days listed are based on GDUs, so consider this for your crop growth stage and field soil moisture levels so you can start tapering off). This tool helps you calculate potential black layer date based on your planting date and relative maturity: https://mygeohub.org/groups/u2u/purdue_gdd. What I’m currently seeing is that 2022 is around 70 GDD higher for York than the 30 year average and is tracking pretty similarly to 2012.

  • Corn at Dough needs 7.5” (approximately 34 days to maturity)
  • Corn at Beginning Dent needs 5” of water (approximately 24 days to maturity)
  • Corn at ¼ milk needs 3.75” (approximately 19 days to maturity)
  • Corn at ½ milk (Full Dent) needs 2.25” (approximately 13 days to maturity)
  • Soybean at beginning seed (R5) needs around 6.5” (approx. 29 days to maturity)
  • Soybean at full seed (R6) needs 3.5” (approx. 18 days to maturity)
  • Soybean with leaves beginning to yellow (R6.5) needs 1.9” (approx. 10 days to maturity)

I share that yet acknowledge what I’ve heard in the weariness of irrigating and the temptation to quit early. My guess is there’s many feeling this way…and it seems especially long to those who have replant crops. Ultimately would just encourage you to finish strong!

Verbal Land Lease Agreements: Have received a few questions on timing to notify of terminating a verbal land lease; that date is Sept. 1 for Nebraska. I have searched and am unaware of a good template for this notification. The verbal lease date doesn’t apply to written leases as dates should be specified within them. Templates for written leases can be found at: https://aglease101.org/doclib/.

Renovating Lawns in the Fall: August 15-September 15 are the best times to seed cool season grasses. Improving Turf in the Fall at https://go.unl.edu/rz9z is a great resource to walk you through renovation depending on your situation. Some lawns can be easily improved by adding fall fertilizer.

Sarah Browning, Extension Horticultural Educator shares, “Late summer or fall fertilization of Kentucky bluegrass and tall fescue lawns is the most important time to fertilize these cool season grasses. Fertilizer promotes recovery from summer stress, increases density of thinned turf, encourages root and rhizome growth, and allows the plant to store food for next spring’s growth flush. Lawns that are 10-15 or more years old typically need only two fertilizer applications a year. Make the fall application in late August or early September. On younger lawns, two fertilizer applications during fall are recommended. Make the first one in late August/early September, and the second in mid-late October.”

If overseeding is needed to fill in thinned areas but more than 50% of good turf remains, mow the existing grass 2.5” tall to make the soil prep easier. For lawns needing total renovation, start with a glyphosate (Roundup application) followed by waiting at least 7-10 days to kill the lawn. Mow dead vegetation as short as mower goes to then aerate the lawn three times. Full seeding rate for tall fescue is 6-8 lbs./1,000 sq.ft., and 2-3 lbs. for Kentucky bluegrass. When overseeding into an existing lawn, the seeding rate can be cut in half. Drilling the seed is perhaps best, otherwise, use a drop seeder. Seed half the seed north/south and the other half east/west for even distribution. Then lightly rake to ensure seed to soil contact.



Example of using the GDD U2U tool (https://mygeohub.org/groups/u2u/purdue_gdd). Input your zip code or select your county. Then add your planting date and relative maturity to view a prediction for black layer and first 28F frost based on 30 year weather data. The tool is also showing that 2022 is above the 30 year GDD average. Right now it’s about 70 units higher in York and is predicted to continue on a higher trend as the season progresses. Selecting a comparison year (I chose 2012), it shows 2022 is tracking very similarly for the time being.
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