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مرکز اطلاعات علمی SID1
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    1-9
Measures: 
  • Citations: 

    2
  • Views: 

    938
  • Downloads: 

    190
Abstract: 

Conservation of soil and water resources in Iran is of great importance for crop production as well as for environment protection. Due to limited soil and water resources in Iran, new methods that can optimize the use of water and fertilizers for crop production are very important. In this study, the alternate furrow irrigation which is a relatively new method for reducing irrigation water for canola production was investigated. In this study, three irrigation methods including ordinary furrow (OF), variable alternate furrow (VAF) and fixed alternate furrow (FAF) were investigated. In each method, four different nitrogen fertilizer treatments with 0, 100, 200, and 300 kg/ha was applied. The results indicated that the best economic productivity of water usage was obtained in the VAF method with 200 kg/ha nitrogen application. Consequently, this treatment can be recommended for canola production in the studied area.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    11-27
Measures: 
  • Citations: 

    2
  • Views: 

    1145
  • Downloads: 

    615
Abstract: 

Determining flood producing regions and sub-basins flood producing priorities are considered very important in the management of large watersheds. In this paper the flood routing role in separating and determining flood producing regions in the Bostan dam watershed of Golestan province in northern Iran after discharge routing of sub-basins in main waterways up to the main outlet of watershed was studied.For achieving the above goal, geographical information system (GIS), a hydrological model (HEC-HMS) and individual iterative elimination of sub-basins was used to calculate related hydrographs with design precipitation for each sub-basin. With consecutive elimination of sub-basins in each run of the model, the total discharge from whole watershed basin after flood routing in main waterways with considering the eliminated sub-basin was calculated; therefore effect of each sub-basin in flood producing capacity at the main outlet was determined. The sub-basin, with highest contribution in producing watershed outlet flood was recognized as most producing flood sub-basin. Then other sub-basins were ranked according to their quantitative share in producing flood discharge at outlet. Flood routing in waterways showed that contribution rate of sub-basins in outlet flood was not proportional with peak discharge of sub-basins and those sub-basins with higher discharge do not necessarily have the highest contribution in basin's outlet flood, since waterways parameters of routing and the spatial location of sub-basins can change the contribution status. In order to eliminate the area effect in sub-basin ranking, the degree of influence of every sub-basin unit in the outlet flood was calculated, which changed the flood producing ranking of sub-basins. Finally with respect to the obtained results, required management guidelines were suggested.

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    29-42
Measures: 
  • Citations: 

    4
  • Views: 

    1020
  • Downloads: 

    502
Abstract: 

Moisture distribution in soil is one of the most important principals in drip irrigation designs. The moisture distribution analysis was applied to select drip discharge. This is usually performed based on engineering skills. The objectives of this study were to model and analyze moisture distribution and to introduce a discharge selection procedure. Consequently, an experiment was carried out in which the drip system was selected to be point source including discharges of 2 to 8 lhr-1. The wetted patterns from drips were measured and analyzed for onion, potato and tomato. The obtained results showed that the most suitable discharges to irrigate onion, potato and tomato were 2 lhr-1 (with one day interval, 6 hr application time), 2 (with one day interval, 7 hr application time) and 8 lhr-1 (with 3 day interval, 2 hr application time), respectively.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    43-51
Measures: 
  • Citations: 

    0
  • Views: 

    883
  • Downloads: 

    526
Abstract: 

Agriculture sector is the largest water consumer in Iran in terms of water volume. Improvement of water use efficiency in this sector would enhance economic efficiency on one hand, and alleviate the challenges of limited renewable water resources on the other hand. Considering this fact, for identification of spatial and temporal variation of wheat crop water use efficiency, this research was carried out in Hamadan province area. The main objective of this study was to identify the best location and scheduling for planting wheat crop to obtain maximum water use efficiency. Wheat evapotranspiration was determined at selected meteorological stations and overall evapotranspiration in the area has been determined using IDW interpolation method. Then, the GIS map of wheat water use efficiency was produced using wheat yields data. The results indicated that west and south-west area of the province have the highest water use efficiency for wheat production.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

AKBARI NODEHI DAVOOD

Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    53-61
Measures: 
  • Citations: 

    1
  • Views: 

    912
  • Downloads: 

    504
Abstract: 

In order to investigate the effect of water stress at different growing stages of soybean, an experiment was conducted in Mazandaran in a complete random block design with seven treatments and three replications. The treatments were consisted of: TR0 (no water stress), TR1 (water stress at vegetative stage), TR2 (water stress at flowering stage), TR3 (water stress at grin filling stage), TR4 (water stress at vegetative and flowering stage), TR5 (water stress at vegetative and grin filling stage) and TR6 (water stress at flowering and grin filling stage). The soil moisture was measured during the experiment by a gravimetric method, and hence, crop actual evapotranspiration was calculated by water balance method. The low rainfall amount did not disturb the treatments. After maturity, grin yield was measured, with yield response factor (Ky) being calculated for each growth stage and according to FAO method. The results indicated that the highest (5100 kg. ha-1) and lowest (2590 kg. ha-1) yield were obtained in TR0 and TR6 treatments, respectively. The largest seasonal evapotranspiration (367mm) and the lowest (225mm) were belonged to TR1 and TR6, respectively. The yield response factor (Ky) was 0.87 for the total growth period and this factor at vegetative, flowering and grin filling stages were 0.148, 0.8 and 1, respectively.

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    63-75
Measures: 
  • Citations: 

    0
  • Views: 

    1744
  • Downloads: 

    716
Abstract: 

Considering the limited resources of water and dominant draughts, deficit irrigation is an important strategy to obtain the product in water shortage conditions. Deficit irrigation aims to produce more products from less water. Therefore, an experiment was conducted in order to evaluate the impact of deficit water and poultries manure on the performance, performance components, and water use efficiency of potato in Jiroft. The experiment was conducted in strip-plot form in the complete random blocks design with three replications. Three water levels as a main factor including 100, 75 and 50 percent of plant water requirement and four manure levels as secondary factor including 0, 5, 10 and 15 Ton ha-1 were considered. The results indicated that different levels of irrigation and poultries manure on both water use efficiency and potato yield were (1%). Also, the impact of different levels of irrigation and the poultries manure on the weight of potato tuber is significant.Moreover, the interaction of the irrigation regime and poultries manure on water use efficiency and potato yield was not significant. Furthermore, the effect of different levels of irrigation and poultries manure alone on the plant height was not significant, but their interaction was significant.Though the effect of different irrigation levels on the percentage of dried material of tuber was not significant, the impact of different levels of poultries manure, and the interaction of irrigation regime and poultry manure on tuber dry matter was significant.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    77-100
Measures: 
  • Citations: 

    0
  • Views: 

    1291
  • Downloads: 

    616
Abstract: 

Iron deficiency is the most widespread deficiency among the plant micro nutrients. Nowadays, different materials such as inorganic salts, organic chelates, soil acidifying materials and industrial wastes are used to overcome iron deficiency. Slag and convertor sludge of steel factories contain considerable amount of iron. Application of slag and convertor sludge to soil may affect bioavailability and chemical forms of iron in soil. The objectives of this study were to investigate the application effect of slag and convertor sludge of Esfahan iron melting factory on the chemical forms of iron, distribution of these forms and bioavailability of iron in surface (0-20 cm) and subsurface (20-45 cm) soil of three research fields. Each plot received 3 treatments] control, 4 times critical level as slag (S40) and converter sludge (L40) in 3 replications for one, two and three years. The Tessier and Shuman method was used for chemical forms of iron analysis. The results indicated that more than 99% of the applied Fe occurred in residual, Fe oxide and hydroxide and free forms. The order of the chemical forms in Khazaneh field was: residual>bound to Fe oxide and hydroxide>free iron>amorphous iron>bound to crystalline Mn oxide>soluble iron>bound to organic matter>exchangeable Fe>carbonate Fe. In Lavark and Shervedan fields the order was the same, but carbonate Fe was more than exchangeable Fe. Application of slag and convertor sludge for three consecutive years was increased the chemical forms and (DTPA) extractable iron in surface and subsurface soils of three experimental fields.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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