Delaware County Soil Temperature Report May 7, 2024

The CCE and WAC Team measured soil temperatures again this week to assess planting conditions. We measured soil temperatures on Tuesday morning, May 7, at several sites across Delaware County. The morning was chilly (high 30’s low 40’s at 7:00 am) with clear sunny skies. Soil conditions were generally favorable in most fields. Soils warmed steadily through the morning, so pay attention to the sample time in the chart below when considering the results.

We suggest planting corn when:
• soil conditions are dry and suitable for good planter function
• soil temperature is above 50⁰
• and the 5-7-day forecast is for continued warm weather

This week’s soil temperatures were slightly below 50⁰ early morning, warming to above 50 by 8:00 am. The 10-day forecast is for favorable temperatures, but likely rainy weather. Corn planting can proceed when soil conditions are favorable for planting.

The chart below shows the soil temperature measured at 32 locations on May 7.

Corn Planting vs Hay Harvest Conflict

With scissor cut measurements (see the Scissors Cut Report coming later this week) showing grass grass heights ahead of average combined with a rainy forecast, we can expect corn planting and hay harvest to be ready at the same time. Generally, in this situation, we recommend delaying corn planting a few days until first cut on core hay fields is done, then finish corn planting before completing first cutting. Hay quality decreases fast, and delayed cutting may also reduce second cut yields. Any corn that can be planted now, before first cutting is ready, will be a benefit.

Weed Control

Planting corn is expensive, and weed control is a significant part of that cost. But, poor weed control costs even more in reduced yield and quality. Select the right herbicide combination for the weed situation you have, even if you have to spend a little more. Consider a combination of herbicide groups to reduce the development of herbicide resistance. Repeated use of the same program over time can select for weed resistant weed population that is often difficult to overcome.

This will be our last soil temperature survey for the season.
Stay Safe and enjoy the spring.