Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Too Late For Landplaster?

Posted by romeethredge on August 8, 2013

A big fertility issue with peanuts this year that  was caused by the unusually wet weather is delayed gypsum/(landplaster)  applications.

Dr. Glen Harris, UGA Extension Soil Scientist, gives us the latest info concerning this.


  The recommended time to  apply gypsum is early bloom, which normally occurs around 45 days after  planting (or maybe as early as 30 days after planting).  Many peanut fields were simply too wet to  apply gypsum at this time.  How late is  too late to apply gypsum ?  Again, since  the “peak pod fill” period is 60 to 90 days after planting, and this is time  when developing are “sucking in” calcium dissolved in the soil solution  directly through the hull, once you get to 100 days after planting, it is  definitely too late to apply gypsum.   What about 60 days after planting ?   Well, 60 days after planting is better than 70 days after planting… which  is better than 80 days after planting (you get the idea).

Two other things to keep in mind if you are considering a  late (60-90 days after planting) gypsum application though are 1) will you do  more damage running over lapped vines than you gain by adding calcium?, and 2)  Did you really need a gypsum application in the first place?  Remember that if you had at least 500 lb/a of  soil test calcium in the pegging zone (top 3 to 4 inches of soil) AND a calcium  to potassium ratio in this soil sample of at least 3:1 or better, AND you are  not producing peanuts for seed….than you technically did not need a gypsum  application at all.  I hear about many  soil samples being in the 700, 800, 900 even 1000 lbs of Ca/a and with all the  rainfall we have had there should be plenty of soil water in the pore space to  dissolve the soil calcium and get it into the nuts.


2 Responses to “Too Late For Landplaster?”

  1. mace said

    We had the 40″ in 30 days here last year. This was mostly after our gypsum applications in May and early June. We had enough pods for 5000 lb peanuts and half empty. A lot of Ton peanuts here in 2012. Calcium is extremely important.

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