I know that many of us have not had to irrigate since the good Lord has sent us some much needed rain, but we have seen things swing the other way pretty quickly. For those that have irrigation, I am including some notes from Dr. John Beasley that cover water usage during different stages of growth.
As we enter the month of July we have fields in Georgia ranging from a week or two after emergence to approximately 75 days after planting. With the weather we’ve had in June, mostly wet and warm, we’ve seen fields put on a tremendous amount of vegetative growth following some significant thrips injury early.
Any field that has begun the pegging process is climbing in water requirement. In fact, any field that has more than 10 pegs per plant and the older pegs are swelling should be receiving 1.5 to 2 inches of water per week in rainfall and/or irrigation. The critical time frame for water requirement is the 8-week period of weeks 10 – 17 after planting, or days 70 – 120. There is only a small percentage of fields in Georgia that are at the 70-day mark as we enter July but a very high percentage will be in that time frame at the end of the month.
It is understood that peanut yield has strong ties to available soil moisture and the recommendations from Dr. Beasley come from years of research conducted in small plot as well as large on farm trials. Be sure to make every effort to meet the requirements of 1.5 to 2 inches per week from 70 to 120 days.