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Title: Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden

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Journal Volume: 241-242; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-07-05 09:21:46; Journal ID: ISSN 0016-7061
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Eriksson, Ann Kristin, Gustafsson, Jon Petter, and Hesterberg, Dean. Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden. Netherlands: N. p., 2015. Web. doi:10.1016/j.geoderma.2014.10.023.
Eriksson, Ann Kristin, Gustafsson, Jon Petter, & Hesterberg, Dean. Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden. Netherlands. doi:10.1016/j.geoderma.2014.10.023.
Eriksson, Ann Kristin, Gustafsson, Jon Petter, and Hesterberg, Dean. Sun . "Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden". Netherlands. doi:10.1016/j.geoderma.2014.10.023.
title = {Phosphorus speciation of clay fractions from long-term fertility experiments in Sweden},
author = {Eriksson, Ann Kristin and Gustafsson, Jon Petter and Hesterberg, Dean},
abstractNote = {},
doi = {10.1016/j.geoderma.2014.10.023},
journal = {Geoderma},
number = C,
volume = 241-242,
place = {Netherlands},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}

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Publisher's Version of Record at 10.1016/j.geoderma.2014.10.023

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Cited by: 17works
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  • Phosphate fertilizers contain varying amounts of Cd and other heavy metals as contaminants from phosphate rock (PR). To determine whether periodic applications of P fertilizers resulted in measurable accumulations of Cd in soils and in harvested crops, soil and plant tissue samples from nine long-term (>50 yr) soil fertility experiments in the USA were analyzed for Cd, as well as P and other elements. Annual Cd rates were estimated to range from 0.3 to 1.2 g ha/sup -1/ in these experiments. Plant tissues analyzed were corn (Zea mays L.), soybean (Glycine max L. Merr.), and wheat (Triticum aestivum L.) leavesmore » or grain, and timothy (Phleum pratense L.) forage. Results from these long-term experiments have shown that plant uptake of Cd contaminants in P fertilizers containing < 10 mg Cd kg/sup -1/ is negligible. While the Cd accumulations in soil in these experiments could not be calculated, they would approximate that accumulated in most agricultural soils in the USA at this time. About 70% of the P fertilizers is produced from Florida PR, which contains <10 mg kg/sup -1/ of Cd, as compared with about 10% from the western USA, which contains higher Cd levels. Therefore, adding Cd to soils as a contaminant in P fertilizers at rates ranging from 0.3 to 1.2 g Cd ha/sup -1/ does not appear to result in increased Cd levels in plants as a result of long-term P fertilization.« less
  • Soils from citrus groves that had been fertilized with the equivalent of approximately 175 kg P/ha per year (as treble superphosphate (TSP)) over a 36-year period were sampled and analyzed for total P, Cd, and Zn as well as water-soluble P and Cd. A P fertilization rate of 175 kg/ha is much higher than normal field rates, which are typically about 30 kg/ha. Concentrations of total Cd in surface soil were highly correlated (r = 0.89) with concentrations of total P. The concentrations of Cd in surface soil receiving broadcast P for 36 years averaged 1.0, and were considerablymore » greater than those of the controls, which showed a mean concentration of 0.07 Phosphorus in soil saturation paste extracts ranged from 0.10 (controls) to 8.87 in P fertilized soils. Water-soluble saturation extract Cd ranged from 0.008 in controls to 0.017 in fertilized soils, and was not well correlated with water-soluble P. Cadmium levels in barley (Hordeum vulgare var. U.C. 566) grain and leaves grown in the field on soil subject to long-term heavy P fertilization were not elevated above levels in barley grown on the control soil. Swiss chard (Beta vulgaris var. cicla) was grown in the greenhouse on the above surface soils collected from the field. Although Cd levels averaging 1.6 in plant tissue were significantly elevated over those on the control soil (0.26, no yield depression was observed.« less
  • In a retrospective cohort study of survivors of cancer and of controls, we estimated the risk of infertility after treatment for cancer during childhood or adolescence. We interviewed 2283 long-term survivors of childhood or adolescent cancer diagnosed in the period from 1945 through 1975, who were identified at five cancer centers in the United States. Requirements for admission to the study were diagnosis before the age of 20, survival for at least five years, and attainment of the age of 21. In addition, 3270 controls selected from among the survivors' siblings were interviewed. Cox regression analysis showed that cancer survivorsmore » who married and were presumed to be at risk of pregnancy were less likely than their sibling controls to have ever begun a pregnancy (relative fertility, 0.85; 95 percent confidence interval, 0.78 to 0.92). Radiation therapy directed below the diaphragm depressed fertility in both sexes by about 25 percent. Chemotherapy with alkylating agents, with or without radiation to sites below the diaphragm, was associated with a fertility deficit of about 60 percent in the men. Among the women, there was no apparent effect of alkylating-agent therapy administered alone (relative fertility, 1.02) and only a moderate fertility deficit when alkylating-agent therapy was combined with radiation below the diaphragm (relative fertility, 0.81). Relative fertility in the survivors varied considerably according to sex, site of cancer, and type of treatment; these factors should be taken into consideration in counseling survivors about the long-term consequences of disease.« less