Mahmoud Lotfi; Elham Ali abadi; Ali Rezvani; Reza Amiri
Volume 13, Issue 1 , August 2011, , Pages 65-74
Abstract
The effects of priming treatment using five osmotic solutions (PEG, manitol, KNO3, KH2PO4 and combination of two salts) in six osmotic potentials (-1 to -1.5 MPa) was studied on germination percentage, rate and uniformity of melon seeds. The best results were obtained with high concentrations of KNO3 ...
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The effects of priming treatment using five osmotic solutions (PEG, manitol, KNO3, KH2PO4 and combination of two salts) in six osmotic potentials (-1 to -1.5 MPa) was studied on germination percentage, rate and uniformity of melon seeds. The best results were obtained with high concentrations of KNO3 and lower concentrations of manitol. Mean germination time of melon seeds in 19°C was preceeded 36 to 48 hours and more uniformity observed but percent germination decayed a little (1-4 percent) reduced in some cases. In addition, storage of primed seeds in room temperature for four months reduced their quality lightly however major priming effects were conserved. In second trial which was done using KNO3 and manitol seeds were suspended in solutions freely or inside bags and also under temperatures 19°C and 22°C, the fastest germination was occurred using manitol inside bags and -1.5 MPa. Effects of priming were more abvious in lower temperatures and also lower potentials showed had better results for uniformity, consistantly.
Behzad Azadegan; Reza Amiri
Volume 12, Issue 1 , May 2010, , Pages 1-9
Abstract
The objective of this research was to study the effect of fertilizer management on the yield increase of crop plants. The extra amounts of applied fertilizers were studied by comparison between allocated, applied and recommended fertilizers’ amounts for: wheat, barley, corn and alfalfa with four ...
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The objective of this research was to study the effect of fertilizer management on the yield increase of crop plants. The extra amounts of applied fertilizers were studied by comparison between allocated, applied and recommended fertilizers’ amounts for: wheat, barley, corn and alfalfa with four replicates and the other data was gathered via questionnaires. Soil analysis of phosphorus, potassium and nitrogen amounts was performed in 20 fields and analysis of data was conducted base on complete randomized block design. Comparison of the averages was showed that there were significant differences between the amounts of allocated, applied and recommended fertilizers (P? 0.05). The average amounts of extra applied and extra distributed fertilizers were 382.9 and 150.6 Kg.ha-1 more than the recommended amounts, respectively. However, there was no significance increase in yield. 12 and 28% of farmers used the fertilizers in the basis of recommended and allocated, respectively and 60% of them used more than recommended amounts. Excess fertilizer application due to improper management causes reduction of soil and water quality.
Hamid Iran nejad; Mahboobeh Poshtkoohi; Zeinab Javanmardi; Reza Amiri
Volume 11, Issue 2 , November 2009, , Pages 11-17
Abstract
The performance of nine different linseed cultivars studied in a randomized complete block design (RCB) with four replications in Varamin region (Iran) in 2006. The traits were seed yield, fatty acids, protein and oil content of linseed. The difference between cultivars was significant for all traits ...
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The performance of nine different linseed cultivars studied in a randomized complete block design (RCB) with four replications in Varamin region (Iran) in 2006. The traits were seed yield, fatty acids, protein and oil content of linseed. The difference between cultivars was significant for all traits (P< 0.01). The Legina cultivar had the highest seed yield (3000 kg/ha) and linolenic acid content (45.16 percent). The palmitic acid content of RH 14/05 cultivar, oil percent and stearic acid of GOLDA cultivar, and protein content and yield of native cultivar were higher than other cultivars (p< 0.05). The RH 14/05 cultivar which was low in linolenic acid and high in oleic acid can be used as a breeding line to produce oil.
Zinat Hajihashemi; Gholam Abbas Akbari; Amir Hossein Shirani rad; Reza Amiri; Shahryar Dashti
Volume 11, Issue 2 , November 2009, , Pages 29-39
Abstract
In order to study the effect of drought stress in terminal growth period on agronomical and physiological characteristics of canola (Brassica napus L.) cultivars, a field experiment was conducted using split-plot layout based on randomized complete blocks design with four replications at experimental ...
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In order to study the effect of drought stress in terminal growth period on agronomical and physiological characteristics of canola (Brassica napus L.) cultivars, a field experiment was conducted using split-plot layout based on randomized complete blocks design with four replications at experimental field of Seed and Plant Improvement Institute, Karaj in 2006. There were two factors, including irrigation at two levels (irrigation after 80 mm evaporation from class “A” pan as control and drought stress from flowering stage until physiological maturity) as main plots. In addition, twelve spring cultivars: (RGS003, Sarigol, Hyola401, Hyola 60, Hyola 330, Kimberly, 19-H, PR-401/16, PP-308/8, ORS 3150-3006, RG 4403, and RGAS 0324) were applied in sub plots. Results showed that RG 4403 had maximum grain yield (3228 Kg/ha) and harvest index (29.9%). In drought stress conditions, best cultivar in grain yield, 1000-seeds weight and oil yield was 19-H and with comparison of stress tolerance indices had better compatibility to water stress. Sarigol and Hyola330 had the lowest yield and yield components and ORS3150-3006 was the most sensitive to water stress.