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S.E. Iowa | I cant answer your questions on metals. !2 years ago or so Farm Journal had a article about fertilizer sources. Some of them come from industry. One of the points by the naysayers was they went into the silo as a hazardous material and came out as fertilizer. Other said it was great fertilizer. There are some municipal sludges that are applied by "metal loading". This means that they only allow X amounts applied per acre per year, no matter what the fertility value is. Clean sludges have low metals content. Some of the "regulated" metals you may buy as a micro nutrient. | |
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Heavy metals (ed winkle and others)
