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Improving ammonium and nitrate release from urea using clinoptilolite zeolite and compost produced from agricultural wastes.

Omar L, Ahmed OH, Ab Majid NM - ScientificWorldJournal (2015)

Bottom Line: Ammonium and NO3 (-) leaching losses during the 30 days of the leaching experiment were highest in urea alone compared with urea with clinoptilolite zeolite and compost treatments.At 30 days of the leaching experiment, NH4 (+) retention in soil with urea amended with clinoptilolite zeolite and compost was better than that with urea alone.Urea can be amended with clinoptilolite zeolite and compost to improve NH4 (+) and NO3 (-) release from urea.

View Article: PubMed Central - PubMed

Affiliation: Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia, Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia.

ABSTRACT
Improper use of urea may cause environmental pollution through NH3 volatilization and NO3 (-) leaching from urea. Clinoptilolite zeolite and compost could be used to control N loss from urea by controlling NH4 (+) and NO3 (-) release from urea. Soil incubation and leaching experiments were conducted to determine the effects of clinoptilolite zeolite and compost on controlling NH4 (+) and NO3 (-) losses from urea. Bekenu Series soil (Typic Paleudults) was incubated for 30, 60, and 90 days. A soil leaching experiment was conducted for 30 days. Urea amended with clinoptilolite zeolite and compost significantly reduced NH4 (+) and NO3 (-) release from urea (soil incubation study) compared with urea alone, thus reducing leaching of these ions. Ammonium and NO3 (-) leaching losses during the 30 days of the leaching experiment were highest in urea alone compared with urea with clinoptilolite zeolite and compost treatments. At 30 days of the leaching experiment, NH4 (+) retention in soil with urea amended with clinoptilolite zeolite and compost was better than that with urea alone. These observations were because of the high pH, CEC, and other chemical properties of clinoptilolite zeolite and compost. Urea can be amended with clinoptilolite zeolite and compost to improve NH4 (+) and NO3 (-) release from urea.

No MeSH data available.


Retention of soil exchangeable ammonium and available nitrate after 30 days of leaching experiment. Note. T0: 64 g soil (no urea); T1: 64 g soil + 7.40 g urea (no additives); T2: 64 g soil + 7.40 g urea + 6 g clinoptilolite zeolite; T3: 64 g soil + 7.40 g urea + 1.54 g compost; T4: 64 g soil + 7.40 g urea + 1.54 g compost + 6 g clinoptilolite zeolite. Means with different letters indicate significant difference between treatments by Tukey's test at P ≤ 0.05. Note. Bar represents standard error of the mean.
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fig8: Retention of soil exchangeable ammonium and available nitrate after 30 days of leaching experiment. Note. T0: 64 g soil (no urea); T1: 64 g soil + 7.40 g urea (no additives); T2: 64 g soil + 7.40 g urea + 6 g clinoptilolite zeolite; T3: 64 g soil + 7.40 g urea + 1.54 g compost; T4: 64 g soil + 7.40 g urea + 1.54 g compost + 6 g clinoptilolite zeolite. Means with different letters indicate significant difference between treatments by Tukey's test at P ≤ 0.05. Note. Bar represents standard error of the mean.

Mentions: At the end of the leaching experiment (30 days of leaching), urea with clinoptilolite zeolite and compost (T2, T3, and T4) showed significant concentrations of soil exchangeable NH4+ and available NO3− compared to urea without additives (T1) (Figure 8). Soil exchangeable NH4+ and available NO3− were lower in urea without additives (T1) at the end of leaching study because they were leached as discussed previously (Figure 7). The availability of NH4+ and NO3− in the soil with clinoptilolite zeolite is possible because the channels in clinoptilolite zeolite effectively absorbed NH4+ and NO3− and released them slowly. The high affinity of the clinoptilolite zeolite for NH4+ in particular is due to the small size of channels that protect NH4+ from excessive nitrification [9]. In a related study, clinoptilolite zeolite was used to improve soil retention of NH4+. The use of clinoptilolite zeolite also minimized the conversion of NH4+ to NO3− [16].


Improving ammonium and nitrate release from urea using clinoptilolite zeolite and compost produced from agricultural wastes.

Omar L, Ahmed OH, Ab Majid NM - ScientificWorldJournal (2015)

Retention of soil exchangeable ammonium and available nitrate after 30 days of leaching experiment. Note. T0: 64 g soil (no urea); T1: 64 g soil + 7.40 g urea (no additives); T2: 64 g soil + 7.40 g urea + 6 g clinoptilolite zeolite; T3: 64 g soil + 7.40 g urea + 1.54 g compost; T4: 64 g soil + 7.40 g urea + 1.54 g compost + 6 g clinoptilolite zeolite. Means with different letters indicate significant difference between treatments by Tukey's test at P ≤ 0.05. Note. Bar represents standard error of the mean.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
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fig8: Retention of soil exchangeable ammonium and available nitrate after 30 days of leaching experiment. Note. T0: 64 g soil (no urea); T1: 64 g soil + 7.40 g urea (no additives); T2: 64 g soil + 7.40 g urea + 6 g clinoptilolite zeolite; T3: 64 g soil + 7.40 g urea + 1.54 g compost; T4: 64 g soil + 7.40 g urea + 1.54 g compost + 6 g clinoptilolite zeolite. Means with different letters indicate significant difference between treatments by Tukey's test at P ≤ 0.05. Note. Bar represents standard error of the mean.
Mentions: At the end of the leaching experiment (30 days of leaching), urea with clinoptilolite zeolite and compost (T2, T3, and T4) showed significant concentrations of soil exchangeable NH4+ and available NO3− compared to urea without additives (T1) (Figure 8). Soil exchangeable NH4+ and available NO3− were lower in urea without additives (T1) at the end of leaching study because they were leached as discussed previously (Figure 7). The availability of NH4+ and NO3− in the soil with clinoptilolite zeolite is possible because the channels in clinoptilolite zeolite effectively absorbed NH4+ and NO3− and released them slowly. The high affinity of the clinoptilolite zeolite for NH4+ in particular is due to the small size of channels that protect NH4+ from excessive nitrification [9]. In a related study, clinoptilolite zeolite was used to improve soil retention of NH4+. The use of clinoptilolite zeolite also minimized the conversion of NH4+ to NO3− [16].

Bottom Line: Ammonium and NO3 (-) leaching losses during the 30 days of the leaching experiment were highest in urea alone compared with urea with clinoptilolite zeolite and compost treatments.At 30 days of the leaching experiment, NH4 (+) retention in soil with urea amended with clinoptilolite zeolite and compost was better than that with urea alone.Urea can be amended with clinoptilolite zeolite and compost to improve NH4 (+) and NO3 (-) release from urea.

View Article: PubMed Central - PubMed

Affiliation: Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia, Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia.

ABSTRACT
Improper use of urea may cause environmental pollution through NH3 volatilization and NO3 (-) leaching from urea. Clinoptilolite zeolite and compost could be used to control N loss from urea by controlling NH4 (+) and NO3 (-) release from urea. Soil incubation and leaching experiments were conducted to determine the effects of clinoptilolite zeolite and compost on controlling NH4 (+) and NO3 (-) losses from urea. Bekenu Series soil (Typic Paleudults) was incubated for 30, 60, and 90 days. A soil leaching experiment was conducted for 30 days. Urea amended with clinoptilolite zeolite and compost significantly reduced NH4 (+) and NO3 (-) release from urea (soil incubation study) compared with urea alone, thus reducing leaching of these ions. Ammonium and NO3 (-) leaching losses during the 30 days of the leaching experiment were highest in urea alone compared with urea with clinoptilolite zeolite and compost treatments. At 30 days of the leaching experiment, NH4 (+) retention in soil with urea amended with clinoptilolite zeolite and compost was better than that with urea alone. These observations were because of the high pH, CEC, and other chemical properties of clinoptilolite zeolite and compost. Urea can be amended with clinoptilolite zeolite and compost to improve NH4 (+) and NO3 (-) release from urea.

No MeSH data available.