Soil Mn Concentrations Research Articles

Effects of Incubation and Phosphate Rock on Lead Extractability and Speciation in Contaminated Soils

Lead distribution in 11 contaminated soils among five physical size fractions was studied. Lead was present in elevated concentrations in these soils, ranging from 198 to 12 523 mg kg−1. Although Pb in these soils was randomly distributed among the five size fractions studied, it was slightly concentrated in the silt and clay (< 53 µm) fraction with some exceptions. Several single chemical extractants were used to evaluate Pb availability in the contaminated soils. The effects of incubation and phosphate rock on Pb availability were also investigated. Significant amounts of Pb were extracted with all the extractants. The extractability increased in the order: H2O < Ca(NO3)2 < HOAc < EDTA-NH4OAc. The percentage of Pb extracted generally decreased with increasing incubation time as the soils gradually lost moisture during incubation. Net extractable Pb reduction with incubation time was not correlated with soil pH, organic matter, or total Fe and Mn contents in soils. Reduced Pb extractability with incubation may be attributed to precipitation/adsorption of Pb, rendering Pb less available. Addition of phosphate rock reduced Ca(NO3)2 and HOAc extractable Pb from Pb-contaminated soils, but had little effect on EDTA-NH4OAc extractable Pb. Net extractable Pb reduction by phosphate rock was not correlated with soil pH, organic matter, or other metals such as Zn, Cu, Ni, and Cd in soils, but it was highly correlated with total Pb (r = 0.7). Our results indicate that physical-chemical speciation of Pb-contaminated soils can be a useful tool in evaluating Pb availability.

Effect of soil Ph and nitrogen source on the nutrient status in peach: II. Micronutrients

Abstract The concentration of aluminum (Al), manganese (Mn), iron (Fe), zinc (Zn), and copper (Cu) in leaves, shoots, trunks, and roots, and the content of plant‐available Mn and Al in soil was examined after 13‐year treatments of soil pH and nitrogen (N) source in a peach orchard of North Carolina. Raising soil pH by liming tended to reduce soil Al content, but had no effect on soil Mn. Tissue Al and Mn level was decreased in high pH treatment. Poultry manure application resulted in the highest soil Mn content but the lowest soil Al. In comparison with calcium nitrate [Ca(NO3)2], ammonium sulfate [(NH4)2SO4] increased Al availability in soil while had little effect on soil Mn. Acid‐forming N, especially (NH4)2SO4, increased the concentration of tissue Al, Mn, Zn, and Fe. The plants treated with various basic N materials similarly contained lower levels of Al or Mn. Manure treatment resulted in high tissue Cu and Zn but low tissue Fe levels. Tissue Zn was low when mineral N sources containing calcium (Ca)...

The distribution of Mn, Fe, Gu, and Zn in topsoils and herbage of North West Pembrokeshire

SummaryMn, Fe, Cu and Zn were determined in topsoil and herbage samples from sites in North West Pembrokeshire. Means and ranges for these elements are given and the distribution is shown throughout the sampled area.There are no clear relationships between the total amounts of these elements in the soils and the amounts found in herbage but it is shown that soil drainage strongly influences both soil and plant concentrations, and pH has a strong influence on Mn concentrations in soils and plants.Seasonal variation in plant uptake of these elements is discussed and the effect of soil contamination of herbage, especially on Fe content. It is hoped that data from this area can be used as a guide to the range of values found for Mn, Fe, Cu and Zn in soils and herbage of an area relatively unpolluted from industrial sources for comparison with more polluted regions.

Effect of Fertilizers on Availability of Soil Manganese in Two Soil Types of Madhya Pradesh

Among the various trace elements, Manganese (Mn) has received considerable attention owing to its function as a vital nutrient and its important biological role in plant physiology (Russel, 1953; Rangnekar, 1945). Heintze and Mann (1946) noticed decreased available Mn content due to application of lime to acidic soils. A large part of soil Mn in alkaline soils was observed to be in the unavailable form by Dion and Mann (1946) and Mattson et al (1948). The different fertilizing materials are having different effects on pH and other properties of soil, which leads changes in the status of available nutrients, specifically in case of Mn. Charles and Sherman (1948) found the effect of sulphur in increasing the available Mn content of soil. Venkatesvarlu (1964) found a significant increase in the Mn content of rice when he added extra sulphur as sulphate. Nitrogen and sulphur additions were shown to beneficially affect its availability to arable crops (Mulder et al 1952, Tisdale et al 1949).