The Chemical Estimation of Plant Available Soil Manganese

Abstract

Nine methods of extracting manganese from 25 soils were studied and correlated with manganese absorbed by soybean plants. Two of the methods, extraction with 0.1N H3PO4 and 3N NH4H2PO4 for 1 hour at a 1:10 soil/solution ratio, were developed during the investigation. Of the nine methods investigated, extraction of soil manganese with NH4H2PO4, alcoholic hydroquinone, and H3PO4 yielded the highest correlation coefficients (0.856 to 0.899), had the smallest variances, and as a group were statistically different from extraction with NH4OAc, NaOAc, and total soil manganese as methods of estimating plant available manganese. The ammonium dihydrogen phosphate extraction method with the highest correlation coefficient (0.899) was statistically different from methods of extracting soil manganese with H2SO4, hydroquinone in NH4OAc, HNO3, NH4OAc, NaOAc, and total soil manganese. Results indicate that manganese deficiency in soybeans may be expected if the manganese extracted with ammonium dihydrogen phosphate or phosphoric acid is less than 40 pp2m. With alcoholic hydroquinone, manganese deficiency may be expected if the manganese extracted is less than 125 pp2m.

Coca cola® is it! the ubiquitous extractant for micronutrients in soil

“…The average Fe and Cu concentrations extracted by DTPA reported by Schnug and Pissarek (1981) (Flueh, 1988;Hammes and Berger, 1960;Hoff and Mederski, 1958). The correlation between micronutrients extracted by both methods was always significant but highest with Mn (Table 3).…”

“…According to Schnug and Haneklaus (1992) Hammes and Berger (1960) and Hoff and Mederski (1958) for CocaCola extractable Mn in soil (|ig/g) Passing through the soil adds a very distinctive flavor which makes the refrigerated extractant freshly after use an interesting beverage.…”

Influence of Mulching on the Manganese Content of Corn Plant Tissue1

“…The Webster soil contained 30 ppm available Mn and 2.25% carbon, and had a pH of 7.0. Available ~n content was determined by extraction with NH.H2PO• accordmg to a procedure of Hoff and Mederski (7).…”