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Articles by Mohammad Ali Bahmanyar
Total Records ( 3 ) for Mohammad Ali Bahmanyar
  Seyed Majid Mousavi , Mohammad Ali Bahmanyar and Hemmatollah Pirdashti
  Problem statement: Contents of heavy metals in soil are very important because soil is the first link in the food chain. Approach: But, pay attention to importance the subject, we performed this project to investigate the lead (Pb) and Cadmium (Cd) availability and uptake by rice plant in response to different biosolids Municipal Solid Waste (MSW), Vermicompost (VC) and inorganic Fertilizers (CF) using split plot arrangement based on randomized complete block design with three replications in 2008. Results: The results showed that fertilizer and application periods treatments influenced Pb and Cd accumulation. The highest available Pb (4.89 ppm) and Cd (0.173 ppm) belong to 3 years application of 40 ton.ha-1 MSW +1/2 CF treatment. During 3 years application of 20 ton.ha-1 MSW+1/2 CF the most Pb accumulated in root. Conclusion: The maximum Pb uptake by shoot and grain happened in 40 ton.ha-1 MSW treatment. With application 40 ton.ha-1 VC +1/2 CF, the maximum Cd accumulated in root. During 3 years application of 40 ton.ha-1 MSW and 20 ton.ha-1 VC the highest Cd uptaked by shoot. While, the maximum Cd concentration in grain belong to 20 ton.ha-1 MSW +1/2CF and CF treatments when added to soil for 3 continuous years.
  Hossein Kazemi Poshtmasari , Hemmatollah Pirdashti , Mortaza Nasiri and Mohammad Ali Bahmanyar
  In order to investigating the effects of different urea fertilizer applications and split application on leaves chlorophyll content (flag leaf and other leaves) and biological yield of modern and old rice cultivars, an experiment was conducted at Rice Research Institute of Iran (Deputy of Mazandaran, Amol) during, 2005. Experiment was arranged in split-split plots based on completely randomized block design with 3 replications in which nitrogen fertilizer as urea (including 100, 150 and 200 kg ha-1), split application of urea (including pre-transplanting, tillering and heading stage with different rates) and cultivars (Tarom (old cultivar), Shafagh and GRH1 Hybrid (modern cultivar) were the treatments. Results showed that all mentioned factors had significant effects on chlorophyll content of flag leaf in which the greatest amount of chlorophyll content was belonged to GRH1 hybrid, also increasing of fertilizer rates caused a significant increase in flag leaf chlorophyll content and the among split application levels, the third type of split application had the highest chlorophyll amount of flag leaf. Chlorophyll content of the other leaves also was affected by cultivar and split application in which the highest amount of this trait was observed in GRH1 hybrid and the third type of split application. Biological yield of different cultivars in response to fertilizer amount and split application were significant in which among cultivars Tarom had the highest biological yield. Summary, 200 kg nitrogen fertilizer per hectare and the third type of split application caused a significant increasing of flag leaf chlorophyll content probably related to photosynthesis rate.
  Yahya Kooch , Hamid Jalilvand , Mohammad Ali Bahmanyar and Mohammad Reza Pormajidian

This research was conducted in Khanikan forests located in lowland of Mazandaran province (North of Iran). Eighteen profiles were dug and several chemical, physical and biological soil properties were investigated. The soil properties evaluated were soil pH, bulk density, saturation moisture content, electrical conductivity, organic carbon, total nitrogen, cation exchangeable capacity, available phosphorous, soil texture, calcium carbonate content, number and biomass of earthworms, litter carbon and litter nitrogen. Principal Component Analysis (PCA) was used to identify the variation of soil properties. PCA, a technique which reduces the dimensionality of multivariate data by removing Interco relations among variables, has a number of useful applications in forest researches. The results showed significant relationships between some soil factors with PC1 and PC2 axes, also, among different soil factors, the distribution of forest types was most strongly controlled with some soil characteristics such as acidity, bulk density, texture, phosphorous, organic carbon, total nitrogen and cation exchangeable capacity.

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