Agricultural and Natural Resources Research Center of Iran

Tehran, Iran

Agricultural and Natural Resources Research Center of Iran

Tehran, Iran
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Sharifi-Alhosini M.,Agricultural and Natural Resources Research Center of Iran
Ecology, Environment and Conservation | Year: 2017

The experiment was carried out to investigate grain yield stability of eight wheat varieties (Marvdasht, Cross Arvand, Mahdavi, Pishtaz, Falat, Shiraz, Chamran, Back cross Roshan) at five planting dates, at agricultural and resources research center of Neyshabour, during 2009-2011. Five separate randomized complete blockdesigns with three replications carried out in different planting date. Each planting date considered as an environment. Combined analysis of variance for years and environments was carried out. Year-genotype interaction (p<0.01) and year-environment-genotype (p<0.05) were significant in respect of grain yield. Grain yield did not affect by environment-genotype interaction. Stability analysis carried out using univariate parameters of type 1, 2 and 3. Chamran and Cross Arvand showed higher yield stability based on environmental variability coefficient and environmental variance (type 1 stability parameters). Falat introduced as highest stable genotype base on Eberhart& Russell's joint regression, Wricke'secovalenceand Shukla's stability variance parameters. Results showed that Falat and Chamran were the least sensitive genotypes in respect of planting date, While Shiraz was the most sensitive genotype with least yield stability. Copyright © EM International.


Mostafaei H.,Agricultural and Natural Resources Research Center of Iran
Ecology, Environment and Conservation | Year: 2017

This study aimed to compare dry matter yield determining the LER in monoculture and mixed native vetch (V. ervilia) with barley under rain-fed conditions were performed. Experiment based on a randomized complete block design (RCBD) with eight treatments and three replications were carried out. Treatments based on the weight ratios of intercropping vetch seeds - barley (in two ways topsy-row) and pure cultures of each of them at ratios of 25, 50 and 75 percent came from both plant. Analysis of variance showed a significant difference between experimental treatments in terms of dry weight. Mean comparison was conducted by using Tukey test showed that the highest amount of forage dry weight, the highest value (13.58 ha) owned 50 percent of vetch + 50% barley is mixed for cultivation, while in pure culture vetch, the lowest dry weight (7.16 ha) was produced. In this experiment, LER for all tangled and mixed cultures such as hairy vetch row except for the treatment of 75% vetch and 25% barely was higher than one. It was found that the highest land equivalent ratio of 1.48 that belongs to mixed cropping with 50% hairy vetch + 50% barley and the lowest was 8.0 LER of intercropping 75% vetch + 25 barley the row was obtained. Copyright © EM International.


Afzalinia S.,Agricultural and Natural Resources Research Center of Iran | Zabihi J.,Shiraz University
Soil and Tillage Research | Year: 2014

Area cultivated using conservation tillage methods has recently increased in Iran and soil compaction increment is one of the most challenging issues in this new technology. In addition to the soil compaction status at the end of growing season, soil compaction variation during the growing season is also important because of its potential effect on the crop growth and yield. Therefore, soil compaction variation during the corn growing season under different tillage methods and its effect on the crop yield was investigated in this study. The research was conducted in the form of a split plot experimental design with nine treatments and six replications. Main plots were tillage methods including: (1) conventional tillage method (CT); (2) reduced tillage (RT); and (3) zero tillage or direct drilling (ZT). Soil depth ranges of 0-0.10, 0.10-0.20, and 0.20-0.30. m were considered as sub plots. Soil bulk density (BD) and soil cone index (CI) were measured during corn growth season (eight measurements for bulk density and five measurements for cone index) as indices of soil compaction. Corn silage yield, thousand kernels weight, and grain yield were also determined in this research. Collected data were analyzed using SAS statistics software and Duncan's multiple range tests were used to compare the treatments means. Results indicated that tillage methods and soil depth had a significant effect on the soil bulk density so that the maximum soil bulk density was obtained from ZT method and soil depth range of 0.10-0.20. m. The difference between soil bulk densities in different tillage methods was statistically significant from the beginning of growth season to two month after the first irrigation (sixth measurement); while, this difference was not significant from the sixth measurement to the end of growth season. Soil cone index was also significantly affected by tillage methods and soil depth in such a way that ZT method and 0.20-0.30. m soil depth range had the maximum cone index. Although, the difference between tillage methods for corn yield and yield components was not statistically different, ZT method decreased corn thousand kernels weight, silage yield, and grain yield compared to the CT method for 11.1, 2.4, and 18.2%, respectively. © 2013 Elsevier B.V.


Faraji A.,Agricultural and Natural Resources Research Center of Iran
International Journal of Plant Production | Year: 2010

An alternative means by which to examine the importance of assimilates supply to flower and pod formation is to analyze the relationships of leaf area index (LAI), above-ground dry matter (ADM), leaf area duration (LAD) and crop growth rate (CGR) around flowering with flower number and pod/flower ratio. For this objective, an experiment was conducted at Agricultural Research Station of Gonbad, Iran in 2005-2006 and 2006-2007. The experiment was a randomized complete block design arranged in split plot. Two cultivars of spring type canola (Hyola401 and RGS003) as subplots were grown at 5 sowing dates as main plots, spaced approximately 30 days apart, to obtain different environmental conditions and assimilates availability around flowering. The experiment was conducted at two conditions, i.e. supplemental irrigation and rainfed. In both main (MR) and branch (MR) racemes, flower number increased as LAI and ADM at the beginning of flowering increased. The reduction in flower number with reduction of LAI and ADM is evidence that canola plants can adjust to carbohydrates availability by altering the number of potential resource demanding sinks. Pod/flower ratio was quadratically related to ADM at the beginning of flowering. A significant positive linear relationship was found between LAD and CGR during flowering period and pod/flower ratio. Therefore, potential and actual pod number was related to cumulative dry matter production of the crop until the beginning of flowering and until the end of flowering, respectively.


Hassanpanah D.,Agricultural and Natural Resources Research Center of Iran
Potato Research | Year: 2010

Water deficit is the most important abiotic stress factor in crop production. Evaluation of the response of different potato cultivars to water deficit stress is necessary to release cultivars for regions with water deficit. A split-plot experiment with three replications was carried out during 2005 and 2006. The main factor consisted of three levels of irrigation (irrigation after 25%, 35% and 50% discharge of the available water, i.e. normal conditions, mild stress and severe stress, respectively), and the split factor included seven potato cultivars (Agria, Savalan, Satina, Caesar, Kennebec, Marfona and Santé). Cultivars Savalan, Caesar and Kennebec had higher total and marketable tuber yield, water use efficiency, and values for stress tolerance indices than the other cultivars, both under mild and severe stress conditions. Cultivars Caesar and Kennebec were selected as tolerant cultivars; cultivars Savalan and Satina were identified as moderately tolerant cultivars whereas cultivars Agria, Marfona and Santé proved to be susceptible to water deficit. © 2010 The Author(s).


Ardakani A.S.,Agricultural and Natural Resources Research Center of Iran
Nematology | Year: 2013

The toxicity of three nanoparticles, silver (AgNP, 20 nm), silicon oxide (SiO2NP, 11-14 nm) and titanium oxide (TiO2NP, 20 nm), to the root-knot nematode, Meloidogyne incognita, was studied in laboratory and pot experiments. Application rates of all nanoparticles were 1.5, 3, 6, 12.5, 25, 50, 100, 200, 400 and 800 mg nanoparticles (ml water)-1 for laboratory experiment to determine their effects on motility and mortality of second-stage juveniles (J2). In pot experiment, 0.02, 0.01, 0.005, 0.0025, 0.00125 and 0.0007% (w/w) of nano-silver and nano-titanium were applied to examine effects on nematode activity and plant growth components of tomato (Solanum lycopersicum). Results showed 100% J2 immobility and mortality in treatments of 800, 400 and 200 mg ml-1 of AgNP; the LC50 for AgNP was 100 mg ml-1. J2 mortality was 48, 16 and 7.3% in 100, 50 and 25 mg ml-1 of AgNP, respectively. J2 mortality was 4.3 and 2% in 800 and 400 mg ml-1 of TiO2NP, respectively. No J2 mortality was seen in all other treatments after 24 h exposure. In a pot experiment, all treatments of AgNP and 0.02% TiO2NP completely controlled M. incognita. Treatments of 0.02, 0.01 and 0.005% of AgNP as well as 0.02% of TiO2NP were toxic to tomato plants and significantly reduced tomato root and stem length and fresh weights in comparison to control. © 2013 Koninklijke Brill NV, Leiden.


Khaj H.,Agricultural and Natural Resources Research Center of Iran
Advances in Environmental Biology | Year: 2014

In recent years, Iran has had significant growth in aquaculture as well as some activities on propagation and breeding of native fish have been conducted. Hygiene principles, development of diagnosis methods, prevention and cure of diseases are necessary. Otherwise, sooner or later, aquaculture industry may be jeopardized and suffered by heavy and irreversible losses. Parasitic diseases are one of the dangerous and important diseases among fish and aquatic organisms. Chilodonella is one parasite that infects skin and makes disease. This study aimed to investigate outbreak of Chilodonella in fish pods of Sistan region, located in south of Iran, and their prevention and cure. To implement this project, studying Chilodonella in Sistan ponds including warm and cold water was carried out in the early autumn of 2010 in collaboration with the Fishery office of Sistan region. It lasted about a year and a half. In the beginning, Zahak station was studied for reproduction of warm water fish. 200 pieces of 17 ponds in Zahak consists of carp, grass carp, silver carp, bighead and Russian fed were caught alive and transferred to the laboratory in order to conduct this study. Initially bioassay of fish had been done and then their characteristics were recorded in special forms prepared for this goal. Subsequently, the parts of fish body such as skin, gills and fins were prepared and parasites were observed by microscopes. Although there are a large number of parasites in Sistan region, the results of this study showed that there was found no Chilodonella among fish in experimental ponds. © 2014 AENSI Publisher All rights reserved.


Hassanpanah D.,Agricultural and Natural Resources Research Center of Iran
Biotechnology | Year: 2010

This experiment performed according to the factorial design and on the base of completely randomized design in three replications in 2007. Factor A included four levels of osmotic pressure (0, -1, -2 and -3 bar) and factor B included seven advanced potato cultivars (Agria, Savalan (397007-9), Satina, Caesar, Kennebec, Marfona and Sante). The PEG 6000 was used for exerting the water deficiency stress on the plantlets. The attributes such as germinating ability and root producing was measured. In this stage the cultivar that produced the roots, had moved to the greenhouse. The plantlets were planted in soil bed with mixed of Punce and Biolan with 1:1 v/v. The applied experimental design was factorial on the base of completely randomized design in three replications. Factor A has four levels of osmotic pressure and factor B included seven advanced potato cultivars. After two months, was harvested the mini-tubers and the attributes was measured such as mini-tuber average size, mini-tubers weight and number per plant. The variance analysis results showed that significant difference between osmotic pressure levels, cultivars and their interaction as attributes mini-tubers number and weight per plant and mini-tubers average size in 1% probability. The Caesar and Savalan cultivars had the most number and weight of mini-tuber per plant in -1 bar and Caesar and Kennebec cultivars in -2 bar osmotic pressures. The MP, GMP, STI and MSTI selected Caesar as better cultivar in normal and stress conditions. Results of cluster analysis showed that cultivars grouped in three clusters. The first cluster included Agria, Sante and Marfona (susceptible cultivars), the second cluster Satina, Savalan and Kennebec (moderately tolerance cultivars) and the third cluster Caesar (tolerance cultivar). © 2010 Asian Network for Scientific Information. © 2010 Asian Network for Scientific Information.


Faraji A.,Agricultural and Natural Resources Research Center of Iran
International Journal of Plant Production | Year: 2012

Oil concentration (OC) in canola (B. napus L.) is determined during seed filling period (SFP), and the variation in OC is greatly related to environmental conditions during that period. To determine factors affecting OC in canola, 12 field experiments were conducted at Agricultural Research Station of Gonbad, Iran, during 2000-07. The experiments were carried out under different growing conditions. The regression functions were fitted to the data of each group of genotypes, over years and experiments. Increasing SFP was a determinant factor for increasing OC. Oil concentration was affected by the duration of SFP, which was maximized when plants of both genotypes (open pollinates and hybrids) were exposed to lower temperatures. There was a linear negative relationship between air temperature during SFP and OC. High temperatures, accelerated the rate of plant development, lowered the length of SFP, and reduced OC potential. In both group of genotypes, the variation of OC was explained by rainfall during SFP, and temperature and radiation interactions during the period, as showed by photothermal quotient (PTQ). There was a positive logarithmic relationship between PTQ during SFP and OC. The relationships of OC with duration of SFP, and temperature, PTQ and rainfall during SFP over years, sowing dates and genotypes showed that these variables are generally applicable in canola OC determination.


Arabzadeh N.,Agricultural and Natural Resources Research Center of Iran
Asian Journal of Plant Sciences | Year: 2012

Soluble carbohydrates (sugars) are considered as important metabolites in plants under drought stress. In order to study the trend of changes of this osmolyte when encountering with dryness, the seeds of two species of Haloxylon persicum and Haloxylon aphyllum were planted in vase and their grown twigs underwent drought stress after a one year care and a one month compatibility with the greenhouse environment. The study of changes of this osmoiyte in branchlet and roots of the twigs of these two types of haloxylon was planned within the format of a completely randomize design with two treatments of species and fifteen tension treatments (lack of irrigation of twigs). The Two Species of Haloxylon persicum and Haloxylon aphyllum and the levels 0 (control), 2,4.and 28 days of lack of irrigation were determined as treatments of experiment. The analysis of data in two sides analysis variance was conducted and the averages were compared by using Duncan's test. The study of data of branchlet and root showed that with the possibility of 99%, the effect of drought stress on the increase of the rate of soluble sugar of branchlet and root of both types of haloxylon was meaningful. In addition, between these two species at the same level of reliability, there was a difference. The study of the effect of drought stress on changes of the quantities of total soluble sugars showed that the changes of this factor are of more similarity with changes of soluble sugar of root and they almost obey the same model. The increase of rate of branchlet soluble sugars, root and total soluble sugars were in proportion with the intensity of tension. © 2012 Asian Network for Scientific Information.

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