Showing 4 results for Motaghian
H. R. Motaghian, A. R. Hosseinpour, F. Raeisi, J. Mohammadi,
Volume 4, Issue 3 (Journal of Science and Technology of Greenhouse Culture 2013)
Abstract
Copper (Cu) is an essential micronutrient for plants. However, determination of a suitable extractant of Cu in sewage sludge-amended calcareous soils has seldom been attended. The aim of this research was evaluating several extractants to predict available Cu in 10 untreated and sewage sludge-treated calcareous soils in greenhouse under wheat cultivation. After 1 month incubation, available Cu of soils was determined using 7 chemical procedures (DTPA-TEA, AB-DTPA, Mehlich 1, Mehlich 2, Mehlich 3, 0.1 N HCl and 0.01 M CaCl2). Results showed that Mehlich 3 and 0.01 M CaCl2 extracted the highest and the lowest concentration of Cu, respectively, in untreated and treated soils. In untreated soils, the highest significant correlation (r=0.95**) was between extracted Cu using AB-DTPA with concentration of Cu in wheat shoots. In addition, in sewage sludge-amended soils, the correlation between extracted Cu using AB-DTPA and Mehlich 3 and concentration of Cu in wheat shoots was significant. Prediction of wheat response was improved after addition of clay and sand parameters in regression models. The results showed that proper extraction procedures for available Cu to wheat in untreated and sewage sludge-treated calcareous soils were AB-DTPA and Mehlich 3.
H.r. Motaghian, A.r. Hosseinpour,
Volume 4, Issue 4 (Journal of Science and Technology of Greenhouse Culture 2013)
Abstract
Rhizosphere is a micro zone with profoundly different microbiological and chemical properties compared to the bulk soil, where availability and fractionation of zinc (Zn) may also vary from the bulk soil. This greenhouse research was performed to study the available Zn and its fractions in the bean rhizosphere and bulk soils of 10 calcareous soils using rhizobox. Total organic carbon (TOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), pH and available Zn using 7 chemical extraction procedures and Zn-fractions were determined in the rhizosphere and bulk soils. The results indicated that in the bean rhizosphere soils, TOC, DOC and MBC increased significantly (P<0.01) and pH decreased significantly (P<0.01). Extracted Zn using several chemical extractants (except Mehlich 1 and HCl) in the rhizosphere was significantly (p<0.05) lower than the bulk soils. Also, concentrations of Zn-fractions in the rhizosphere were significantly (p<0.05) lower than the concentrations of Zn-fractions in the bulk soils. Results indicated that significant correlation coefficients between bean indices and extracted Zn using different extractants in the rhizosphere soils were more than the bulk soils. Significant correlation (p<0.05) was found between concentration and uptake of Zn in bean with exchangeable Zn and Zn associated with Fe and Mn in the rhizosphere soils, and with Zn associated with Fe and Mn in the bulk soils. The results of this research illustrated that availability of Zn in the rhizosphere soils are different from the bulk soils. Therefore, using rhizosphere soil would be recommended in the study of available Zn after planting.
Hamidreza Motaghian, Alireza Hosseinpur,
Volume 5, Issue 1 (Journal of Science and Technology of Greenhouse Culture 2014)
Abstract
Determination of copper (Cu) availability in soils is important in preferment quality and quantity of agricultural crops. To this aim, suitable extractant must be introduced. The objective of this greenhouse experiment was to evaluate several extractants to predict available Cu of cultivated bean, in 10 calcareous soils, untreated and treated with municipal sewage sludge. After one month of incubation of soils, available Cu was determined using 7 chemical procedures (DTPA-TEA, AB-DTPA, Mehlich 1, Mehlich 2, Mehlich 3, 0.1 N HCl and 0.01 M CaCl2). The results showed that Mehlich 3 and 0.01 M CaCl2 in treated and untreated soils extracted the highest and the lowest amount of Cu, respectively. Among the extractants used for untreated soils, significant correlation was found between extracted Cu using DTPA-TEA with concentration and uptake of Cu in shoots. In addition, in sewage sludge-amended soils, correlation between extracted Cu using DTPA-TEA, AB-DTPA and Mehlich 3 and concentration, dry matter and uptake of Cu was significant. In general, the results of this research showed that DTPA-TEA could be used to predict available Cu in untreated and sewage sludge-treated calcareous soils under bean cultivation.
H.r. Motaghian, A.r. Hosseinpur,
Volume 6, Issue 1 (Journal of Science and Technology of Greenhouse Culture 2015)
Abstract
Rhizosphere is a small zone with different biological and chemical properties from bulk soil. In this research, kinetics of zinc (Zn) release was compared in wheat (Rowshan Back Cross) rhizosphere and bulk soil in 10 calcareous soils by using rhizobox at greenhouse conditions. The rhizosphere and bulk soil samples were extracted with DTPA-TEA for 1 to 504 h at 25±1 0C. In addition, available Zn was evaluated by chemical extractions (DTPA-TEA, AB-DTPA and Mehlich 3). Results showed that the amount of available Zn, cumulative released Zn and rate of Zn release in the rhizosphere soils were significantly (p<0.05) higher than the bulk soils. Power equation was the best descriptive of Zn release in rhizosphere and bulk soils. In addition, parabolic diffusion, first order and simple Elovich equations could be used to describe kinetics of Zn release. The obtained correlation coefficients between wheat responses and characteristics of Zn release showed that higher significant correlations in the rhizosphere soils were found as compared to the bulk soils.
