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Based on the results of these studies, phosphonate fertilizer was viewed as an inefficient and costly means of supplying phosphorus to plants and scientists eventually lost interest in this compound as a phosphorus fertilizer. Despite previous research findings, phosphonate compounds are marketed by some companies as a source of phosphorus and potassium fertilizer.

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Preliminary results with turfgrasses growing in sand culture and treated with equal amounts of potassium phosphite and potassium phosphate have supported claims that potassium phosphite does not supply usable phosphorus to turfgrasses see fig below. Although potassium phosphite can be converted to phosphate in soil, turf managers should realize that this is an inefficient means of supplying phosphorus to plants when compared with phosphate fertilizer.

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Figure Annual bluegrass treated with a nutrient solution containing potassium phosphate as the source of phosphorus left ; and the same nutrient solution with potassium phosphite as the source of phosphorus right. Annual bluegrass treated with potassium phosphite shows phosphorus deficiency symptoms stunted growth and a red tint to foliage indicating that this compound is not supplying usable phosphorus to the plants.

Claims that phosphonates consistently enhance rooting are debatable and more evidence is needed to support these claims. A two-year study performed at North Carolina State University showed that bentgrass root mass was unaffected by phosphonate products 4. Certainly, more research using precise root measurement techniques is needed to determine if enhanced rooting due to phosphonates occurs under different environmental and management conditions.

Phosphonates as fungicides. The following article provides some good information about phosphorus acid fungicides. Phosphorous acid is H3PO3. Phosphorous acid has both a direct and indirect effect on these pathogens. We found, for instance, that ProPhyt had efficacy against Downy mildew, Phomopsis, The phosponate ion is highly systemic and fairly stable in plants. Phosphorus Compounds. Fundamental understanding of phosphorus behavior is a key to solving environmental problems of plant, animal and microbe nutrition, eutrophication, corrosion, and geochemistry.

This assumption has never been explicitly proven. Phosphorus is unique among the major nutrients carbon, oxygen, nitrogen, phosphorus in that it is often assumed to lack a gaseous species for atmospheric transport. However, the recent work of Glindeman et al.

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Several sources of phosphine have been also identified by these authors. Unfortunately, perhaps because of the erroneous assumption that phosphorus is nonvolatile, study of total transport through this mechanism has received minimal attention, and all atmospheric phosphorus transport is assumed to be via phosphate dust. Atmospheric transport of phosphorus is significant. Pierrou estimated that atmospheric fallout of phosphorus is in the range of 3.

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Bisphenol a exposure in Mexico City and risk of prematurity: a pilot nested case control study. Environ Health. Prenatal di 2-ethylhexyl phthalate exposure and length of gestation among an inner-city cohort. In utero exposure to di- 2-ethylhexyl phthalate and duration of human pregnancy. Maternal urinary metabolites of di- 2-ethylhexyl phthalate in relation to the timing of labor in a US multicenter pregnancy cohort study.

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