WEST LAFAYETTE, INDIANA - If the well-being of the 2011 forage crop reflects past years, Purdue Extension forage specialist Keith Johnson says producers have a lot of work to do in the coming months.
Heavy rainfall followed by a drought hurt the 2010 crop and may have led producers to allow animals to overgraze pastures.
"The 2010 crop year was stressful to forages because the early spring rains didn't allow producers to get the harvested hay crop out of the field as early as they would have liked and the quality was less than desirable," Johnson said. "Following that was a very long, dry period. As time went on, producers were stressing pasture crops they did have and overgrazing occurred."
Regardless of weather, forage growers need to take the time to identify the stresses on their crops season to season so they can eliminate some or all of those issues in the best interest of the existing plants.
First, Johnson said producers need to look at soil types (http://websoilsurvey.nrcs.usda.gov/app/) and take soil samples. Those samples should be dried and sent to be tested (http://www.agry.purdue.edu/ext/soiltest.html) for pH, phosphorus, potassium, magnesium, cat ion exchange capacity and organic matter. A basic test should cover all of these elements.
Any elements of the test that come back at moderate levels or less should be given some attention - especially pH.
"Different crops have a different pH level at which they grow best," Johnson said. "The forage crops we grow, particularly the cool season grasses, really ought to be grown in a soil pH of 6.2-7. Most of the legumes we grow, such as alfalfa, really need a pH closer to 7."
Having the proper soil pH ensures nitrogen fixation and affects the availability of nutrients to the forage crop. A pH that is off could alter the forage composition, and producers could see less desirable forages growing in their fields.
Growers also need to evaluate the stands in their fields. They should look at what is in the pasture and determine whether it's more forages or weeds. If a pasture has been overgrazed and an abnormally large amount of soil is showing, over-seeding might be an option.
Other stressors to watch for and control are weeds, insects and diseases.
"It's the dynamics of growing crops that are important," Johnson said. "Do a good job of scouting. Look at the well-being of the crop as it grows. Understand why the crop might not meet your objective as it grows. Be diagnostic about things and take care of the issues in some fashion so the crop can be as productive as possible."
For farmers unsure of the best process for taking fields or pastures from evaluation to overhaul, Johnson recommended following the Procedural Order for Pasture Renovation:
* Assess the need for pasture improvement.
* Soil test and apply amendments.
* Control perennial broadleaf weeds.
* Leave residual growth at less than 4 inches of height.
* Make seed selections and purchase.
* Over-seed before dormancy breaks.
* Reduce competition to young seedlings by grazing growth of established forages, or by hay harvest.
More information about managing forages is available in the Purdue Extension Forage Field Guide at https://mdc.itap.purdue.edu/newsearch.asp. The guide is $7.
In response to the forage issues of 2010 and the effects of short and low-quality forages on livestock, Johnson and Purdue Extension beef specialist Ron Lemenager hosted a free webinar that is archived and accessible to anyone at http://www.thebeefcenter.com.
SOURCE: Purdue University Extension