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Agronomic Crops Network

Ohio State University Extension


Alfalfa Continues to Mature

The alfalfa crop over the past week has continued to advance in maturity. Pure alfalfa stands across Ohio are ready to be harvested for high quality forage (see table below). Producers in dryer regions were able to start harvesting alfalfa fields over the weekend. Western Ohio has had larger rainfall totals than Eastern Ohio over the last two weeks. Keep in mind that harvesting when the soil is too wet and soft will do non-reversible compaction damage to the stand and will lower the productivity the rest of this year and into future years.

Grasses in Central Ohio have headed out. Once grasses reach the early heading stage, they are already past the prime for high producing lactating dairy cows; however, grass in early heading is still good for feeding to many other classes of livestock with lower requirements than lactating dairy cows. Begin harvesting grasses as soon as you see a good harvest window.

The following table shows estimates of %NDF from several counties in Ohio.



Average % NDF



Auglaize County




Clark County




Crawford County




Licking County



Using the predictive equations for alfalfa quality (PEAQ) for estimating neutral detergent fiber (NDF) can be used for multiple cuttings throughout the growing season. Once the alfalfa crop reaches 16 inches tall, measurements can be taken to estimate %NDF using PEAQ.

Just as a reminder, here are the instructions on how to rapidly predict NDF using PEAQ. Be sure to use this method when estimating NDF on pure alfalfa stands. 

Looking ahead, as we see weather systems from the south move north potato leafhoppers (PLH) may begin to colonize in Ohio’s alfalfa fields. Once PLH eggs are laid it only takes about three weeks for the eggs to develop into adults.  Populations are usually sporadic but if present they can cause severe damage on the alfalfa crop. For more information on potato leafhoppers visit here.

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.