EVALUATION OF CHANGING PROCESS OF AMMONIUM AND NITRATE IN SOIL PROFILE IN THREE CROP ROTATIONS

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KASHISAZ M.; MOEZZI A.A.; SAYYAD G.A.; LOTFALI AYEINE G.A.

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Journal: Journal of Soil Management and Sustainable Production Year:2015 | Volume:5 | Issue:2 Page(s): 149-163

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Title

EVALUATION OF CHANGING PROCESS OF AMMONIUM AND NITRATE IN SOIL PROFILE IN THREE CROP ROTATIONS

Author(s)

KASHISAZ M. | MOEZZI A.A. | SAYYAD G.A. | LOTFALI AYEINE G.A. | Issue Writer Certificate

Keywords

N-NH4Q2

CROP ROTATIONQ2

N-NO3Q2

SOIL PROFILEQ1

Abstract

Background and Objectives: Nitrogen (N) is considered as one of the active elements in nature due to its transformation and mobility processes in heterogeneous soil system. Ease of accessibility and significant effects on crop yield, N-fertilizers consumption rate is high. However 30-50 percentages of applied N can be leached and contaminate water resources and hence endanger environment and human health. Previous studies showed significant positive relationship between applied N-fertilizers rate and nitrate (N-NO3) concentrations in shallow groundwater resources. One of the agricultural management systems which can affect soil N mobility is CROP ROTATION system. Rotation system can affect significantly N use efficiency and N uptake by plants since different crops (in rotations) have various absorbing abilities and N requirements. Previous studies compared the amounts of N-NO3 leaching in maize monoculture and maize-grass rotation systems, demonstrated that the rotation system can reduce leaching by 5 to 10 times compared with the monoculture system. Therefore a field experiment was conducted to study the effects of CROP ROTATION on mineral N-form mobility in SOIL PROFILE.Materials and Methods: A split factorial (in the form of complete random blocks) experimental design was conducted in the field with three replications to evaluate the effects of three common rotation systems on N-NO3 and N-NH4 mobility through the soil. The main factor was common rotation system in Khuzestan province including wheat-corn, wheat-fallow, rice-what. The rotations were started five years ago in the experimental site on permanent plots (each with the area of 5´10 m2). Subfactors were sampling depth (0-30, 30-60, 60-90 cm) and sampling time (seven times after crop planting). In each CROP ROTATION, soil samples were taken from three mentioned depths after each irrigation or rainfall using an auger. In total, soil samples were taken at seven times. Soil samples were analysed for total soil N using Kjeldal method. The concentrations of N-NO3 and N-NH4 were measured by distillation method. Mean measured data were analyzed with Duncan’s mean comparison using MSTATC software, while the Excel was used to draw figures.Results: The results showed that N-NO3 profiles were significantly (P<0.05) different in the rotation systems. N-NO3 concentration in wheat-corn rotation (26.59 mg kg-1) was significantly (P<0.05) higher than the other two rotations. While wheat-rice rotation had the least N-NO3 concentration (6.38 mg kg-1). The highest variation was observed in wheat-corn rotation which shows higher N mobility in this rotation. Rotation type had no significant (P<0.05) effects on N-NH4 profile. However concentration of N-NO3 was more than N-NH4 in the all rotations. The presence of summer fallow in rotation could increase N-NO3 upflux in SOIL PROFILE due to high evapotranspiration.

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APA: Copy

KASHISAZ, M., MOEZZI, A.A., SAYYAD, G.A., & LOTFALI AYEINE, G.A.. (2015). EVALUATION OF CHANGING PROCESS OF AMMONIUM AND NITRATE IN SOIL PROFILE IN THREE CROP ROTATIONS. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, 5(2), 149-163. SID. https://sid.ir/paper/209954/en

Vancouver: Copy

KASHISAZ M., MOEZZI A.A., SAYYAD G.A., LOTFALI AYEINE G.A.. EVALUATION OF CHANGING PROCESS OF AMMONIUM AND NITRATE IN SOIL PROFILE IN THREE CROP ROTATIONS. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION[Internet]. 2015;5(2):149-163. Available from: https://sid.ir/paper/209954/en

IEEE: Copy

M. KASHISAZ, A.A. MOEZZI, G.A. SAYYAD, and G.A. LOTFALI AYEINE, “EVALUATION OF CHANGING PROCESS OF AMMONIUM AND NITRATE IN SOIL PROFILE IN THREE CROP ROTATIONS,” ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, vol. 5, no. 2, pp. 149–163, 2015, [Online]. Available: https://sid.ir/paper/209954/en

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