Abstract
High molecular weight, anionic polyacrylamide (PAM) is currently being used as an irrigation water additive to significantly reduce soil erosion associated with furrow irrigation. PAM contains amide-N, and PAM application to soils has been correlated with increased activity of soil enzymes, such as urease and amidase, involved in N cycling. Therefore we investigated potential impacts of PAM treatment on the rate at which fertilizer N is transformed into NH4/+ and NO3/- in soil. PAM-treated and untreated soil microcosms were amended with a variety of fertilizers, ranging from common rapid-release forms, such as ammonium sulfate [(NH4)2SO4] and urea, to a variety of slow-release formulations, including polymerized urea and polymer-encapsulated urea. Ammonium sulfate was also tested together with the nitrification inhibitor dicyandiamide (DCD). The fertilizers were applied at a concentration of 1.0 mg g-1, which is comparable to 100 lb acre-1, or 112 kg ha-1. Potassium chloride-extractable NH4/+-N and NO3/--N were quantified periodically during 2-4 week incubations. PAM treatment had no significant effect on NH4/+ release rates for any of the fertilizers tested and did not alter the efficacy of DCD as a nitrification inhibitor. However, the nitrification rate of urea and encapsulated urea-derived NH4/+ -N was slightly accelerated in the PAM-treated soil.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 245-248 |
| Number of pages | 4 |
| Journal | Biology and Fertility of Soils |
| Volume | 31 |
| Issue number | 3-4 |
| State | Published - Jun 2000 |
| Externally published | Yes |
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Keywords
- Dicyandiamide
- Nitrogen fertilizer
- Polyacrylamide
- Polymer-encased urea
- Polymerized urea
ASJC Scopus subject areas
- Soil Science
Cite this
Exchangeable ammonium and nitrate from different nitrogen fertilizer preparations in polyacrylamide-treated and untreated agricultural soils. / Kay-Shoemake, Jeanine L.; Watwood, Maribeth E; Kilpatrick, Lisa; Harris, Krista.
In: Biology and Fertility of Soils, Vol. 31, No. 3-4, 06.2000, p. 245-248.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exchangeable ammonium and nitrate from different nitrogen fertilizer preparations in polyacrylamide-treated and untreated agricultural soils
AU - Kay-Shoemake, Jeanine L.
AU - Watwood, Maribeth E
AU - Kilpatrick, Lisa
AU - Harris, Krista
PY - 2000/6
Y1 - 2000/6
N2 - High molecular weight, anionic polyacrylamide (PAM) is currently being used as an irrigation water additive to significantly reduce soil erosion associated with furrow irrigation. PAM contains amide-N, and PAM application to soils has been correlated with increased activity of soil enzymes, such as urease and amidase, involved in N cycling. Therefore we investigated potential impacts of PAM treatment on the rate at which fertilizer N is transformed into NH4/+ and NO3/- in soil. PAM-treated and untreated soil microcosms were amended with a variety of fertilizers, ranging from common rapid-release forms, such as ammonium sulfate [(NH4)2SO4] and urea, to a variety of slow-release formulations, including polymerized urea and polymer-encapsulated urea. Ammonium sulfate was also tested together with the nitrification inhibitor dicyandiamide (DCD). The fertilizers were applied at a concentration of 1.0 mg g-1, which is comparable to 100 lb acre-1, or 112 kg ha-1. Potassium chloride-extractable NH4/+-N and NO3/--N were quantified periodically during 2-4 week incubations. PAM treatment had no significant effect on NH4/+ release rates for any of the fertilizers tested and did not alter the efficacy of DCD as a nitrification inhibitor. However, the nitrification rate of urea and encapsulated urea-derived NH4/+ -N was slightly accelerated in the PAM-treated soil.
AB - High molecular weight, anionic polyacrylamide (PAM) is currently being used as an irrigation water additive to significantly reduce soil erosion associated with furrow irrigation. PAM contains amide-N, and PAM application to soils has been correlated with increased activity of soil enzymes, such as urease and amidase, involved in N cycling. Therefore we investigated potential impacts of PAM treatment on the rate at which fertilizer N is transformed into NH4/+ and NO3/- in soil. PAM-treated and untreated soil microcosms were amended with a variety of fertilizers, ranging from common rapid-release forms, such as ammonium sulfate [(NH4)2SO4] and urea, to a variety of slow-release formulations, including polymerized urea and polymer-encapsulated urea. Ammonium sulfate was also tested together with the nitrification inhibitor dicyandiamide (DCD). The fertilizers were applied at a concentration of 1.0 mg g-1, which is comparable to 100 lb acre-1, or 112 kg ha-1. Potassium chloride-extractable NH4/+-N and NO3/--N were quantified periodically during 2-4 week incubations. PAM treatment had no significant effect on NH4/+ release rates for any of the fertilizers tested and did not alter the efficacy of DCD as a nitrification inhibitor. However, the nitrification rate of urea and encapsulated urea-derived NH4/+ -N was slightly accelerated in the PAM-treated soil.
KW - Dicyandiamide
KW - Nitrogen fertilizer
KW - Polyacrylamide
KW - Polymer-encased urea
KW - Polymerized urea
UR - http://www.scopus.com/inward/record.url?scp=0034048444&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034048444&partnerID=8YFLogxK
M3 - Article
VL - 31
SP - 245
EP - 248
JO - Biology and Fertility of Soils
JF - Biology and Fertility of Soils
SN - 0178-2762
IS - 3-4
ER -