Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Question of the Week – Boron Toxicity

Posted by romeethredge on September 17, 2015

Peanuts need boron. If we don’t have enough we can see hollow heart and other problems. But we don’t need much. We need a half a pound of actual Boron per acre. A product like Solubor is 20% Boron so 2 foliar applications of 1.25 pounds of it will be all a peanut plant needs. If you use a liquid boron then do the math to make sure you get a total of a half pound of actual boron per season.

 Boron (B) is an essential micronutrient that is important to flowering, pollination, and fruiting of the peanut plant. We can get too much of it (maybe over double the recommended rate) however and cause some leaf symptoms like this. I’ve seen similar symptoms when a high rate of Basagran herbicide was applied.

 

IMG_8812

Here are some comments from UGA Scientist Glen Harris. “The standard UGA recommendation is 0.5 lb B/A, applied in two 0.25 lb/A foliar applications with early fungicide sprays. Single applications of 0.5 lb B/A can be used but include a greater risk of foliar burn. Since B leaches readily through sandy soils, foliar applications have always been considered the most effective and efficient application method.

Numerous B fertilizer materials are currently available. Most are either derived from boric acid or sodium borate and can be either in the liquid or wettable powder form. There are many “additives” used with these base B materials such as nitrogen and complexing agents designed to improve efficiency of uptake. However, extensive field testing over recent years has proven that all of the B fertilizers currently on the market are equally effective in terms of plant nutrition. Therefore, choice of B fertilizers should be made on price per pound of B. “

 

This week’s question is about this photo I took last week. A farmer showed me this on a very old farm. What are these 2 structures?

IMG_8699

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One Response to “Question of the Week – Boron Toxicity”

  1. Ward Trulock said

    Syrup and sugar cane mill

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