mohammad ali esmaili; Hbibollah Ranjebar; Hemmatollah Pirdashti; Mortaza Nasiri
Abstract
The field experiment has been conducted as a split split plot based on a randomized complete block design with three replicaitons at Rice Research Institute of Mazandaran Province, Amol, in 2017. In this experiment, the seeds are sown in seedling box with different six bed treatments. These beds include ...
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The field experiment has been conducted as a split split plot based on a randomized complete block design with three replicaitons at Rice Research Institute of Mazandaran Province, Amol, in 2017. In this experiment, the seeds are sown in seedling box with different six bed treatments. These beds include S1: sulfur bed with 50% rice bran, S2: sulfur-free soil with 25% rice bran, S3: sulfur bed with 25% rice bran, S4: sulfur bed with Thiobacillus and 50% rice bran, S5: sulfur-free bed with wood compost and 25% rice bran, and S6: sulfur bed with Thiobacillus with 25% bran rice. After some measurements, the seedling is transplanted in the main field. In the field, different beds in box, seedling number per hill (3 and 5) and planting space (20×20 cm, 30×14cm) are assigned to the main plot, sub plot, and sub sub plot, respectively. The results of main cultivation show that the highest grain yield (5043 kg.ha-1) and biological yield (12319 kg.ha-1) are obtained from the treatment of bed soil with sulfur with 50% bran. Planting arrangement treatment in ratoon cultivation on number of hollow seeds (4.1), grain yield (1617 kg.ha-1), number of plants per hill treatment on number of tillers (10.3), leaf area (10.6 cm2), panicle length (20.4 cm) and grain yield (1613 kg.ha-1), and seedling type treatment on tiller number (10.4) show a statistically significant difference. Seedling grown in sulfur with 50% rice brain display the best performance in terms of yield and yield components in both main and ratoon cropping.
Khadijeh Shahsavarpour Lendeh; Hemmatollah Pirdashti; Esmaeil Bakhshandeh
Abstract
In order to investigate the effect of a native plant growth promoting bacteria (Enterobacter sp.) on some vegetative characteristics and paddy yield of rice(cv. ‘Tarom Hashemi’), a field experiment was carried out in Babol (Aghamalek village) at 2016. This experiment was arranged in split ...
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In order to investigate the effect of a native plant growth promoting bacteria (Enterobacter sp.) on some vegetative characteristics and paddy yield of rice(cv. ‘Tarom Hashemi’), a field experiment was carried out in Babol (Aghamalek village) at 2016. This experiment was arranged in split plots based on a randomized complete block design with three replications. Six levels of potassium sulfate fertilizer (PSF: 0, 25, 50, 75, 100 and 125 kg ha-1) were used as the main plots and four levels of inoculations (non-inoculation as control, seed inoculation in the seedbed condition, seedling root inoculation before transplanting time and combined both previously methods) served as the sub-plots. The results indicated that various methods of inoculation increased plant height (1.25-2.54%), tillers number per hill (TNH; 11.7-16.5%), total leaves number per hill (TLN; 12.5-14.2%), leaf area index (LAI; 7.16-17.9%) and paddy yield (PY; 14.6-19.8%) of rice and the occurring of anthesis stage were about one day sooner as compared to the control condition. In this experiment, the studied traits significantly influenced by PSF and various methods of inoculation, but the interaction effect between them were not significant. Among inoculation methods, the combined method was better than others. In addition, the values of all studied traits such as PH, TNH, TLN, LAI and PY (18.2% more than the control) increased as PSF increased from zero to 125 kg ha-1. Consequently, the application of Enterobacter sp. and PSF through improved the vegetative characteristics, particularly in LAI, TNH and TLN, resulted to increase in the radiation interception capacity, photosynthetic efficiency and improved PY of rice.
Shahriar Kazemi; Esfandiar Farahmand; Hemmatollah Pirdashti; Mojtaba Mahmoudi
Abstract
In order to evaluate the effects of mycorrhiza-like fungi, Piriformospora indica, and mycorrhiza fungi, Glomus mosseae, symbiosys on corn (Zea mays L. cv. SC 704) grain yield and water use efficiency under different limited irrigation regimes and phosphorus, a field experiment was conducted as split ...
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In order to evaluate the effects of mycorrhiza-like fungi, Piriformospora indica, and mycorrhiza fungi, Glomus mosseae, symbiosys on corn (Zea mays L. cv. SC 704) grain yield and water use efficiency under different limited irrigation regimes and phosphorus, a field experiment was conducted as split factorial based on a randomized complete block design at two stations of Gharakhil and Bayekola during growing season of 2015. Treatments were different irrigations at three levels (100, 75 and 50% ofcrop water requirement) in main plots, four levels of inoculation (control, Pi inoculation, Gm inoculation and Pi + Gm inoculation) and three levels of phosphorus (control, 50 and 100 % of crop requirement) in sub plots as factorial. According to the results, simultaneous inoculation of Pi and Gm induced significant increase in grain yield in both regions (8.6 and 6.3 % for Gharakhil and Bayekola stations, respectively). In both regions, symbiotic fungi incolationimprovement of productivity of water use obtained when Pi and Gm were inoculated (especially simultaneous inoculation), in all irrigation treatments. The most of the positive effects of coexistence were observed in both area under irrigation 50% (4.33 and 4.15 Kg/ha, respectively). Overall, the inocolation, results represented a synergistic effect of two applied fungi for ameliorating the corn water use efficiency, especially under limited irrigations.
Nahid Fathi; Hemmatollah Pirdashti; Morteza Nasiri; Esmaeil Bakhshandeh
Abstract
This study aimed to investigate the effect of different local climates on grain yield (GY) and yield components (YC) of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GY and YC with the average of weather temperature ...
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This study aimed to investigate the effect of different local climates on grain yield (GY) and yield components (YC) of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GY and YC with the average of weather temperature (T, °C) and solar radiation (SR, MJ m-2 d-1) during the growing season of rice. Three field experiments were conducted separately based on the randomized complete blocks design with four replications, at the paddy fields of Babolsar, Amol and Polesefid cities in northern Iran in 2014. The results indicated that the effect of different local climates were statistically significant on GY, the number of panicles, length of panicle, weight of panicle, total number of grain in each panicle and the number of filled grain (P < 0.01). In all traits, the values related to Polesefid were lower than both Amol and Babolsar which can be resulted in lower T and SR during the rice growing, especially in the reproductive stage. Decline in T and SR due to increasing in the above mean sea level were cased a decrease in GY and biological yield of both cultivars (about 10-25 percent, depending on the cultivar). In addition, GY was affected by decrease in T more than SR. Consequently, the results shown that we simply can quantify the variation in GY in both cultivars under different local climates and also can calculate a possible reduction in GY due to the delay in transplanting.
Hemmatollah Pirdashti; Behrouz Mahmoudi; Mohammad Yaghubi
Abstract
A field experiment was conducted to investigate the spatial distribution of weeds at the Sari Agricultural Sciences and Natural Resources University in 2011. Field was divided into 42 grids (1.5×1.5 feet) then all samples were taken from grids intersection points before corn planting, after harvesting ...
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A field experiment was conducted to investigate the spatial distribution of weeds at the Sari Agricultural Sciences and Natural Resources University in 2011. Field was divided into 42 grids (1.5×1.5 feet) then all samples were taken from grids intersection points before corn planting, after harvesting and ear emergence stage. Weed maps and semi variance analysis carried out using RW99 and Gs+ softwares. The results showed that the highest amount of weed population belongs to prostrate pigweed, nutsedge and redroot pigweed, respectively. There was a strong and moderate spatial correlation as spherical and exponential variograms model at all stages of sampling. The seed banks were patches with different sizes and densities. Seed bank patchy pattern at the beginning of season was in accordance with seed bank at the end of season. Knowing the seed bank density, we can forecast weed seedling density during crop growing season.
Mohammad Yazdani; Hemmatollah Pirdashti; MOhammad ALi Esmaeili; MOhammad ALi Bahmanyar
Volume 11, Issue 2 , November 2009, , Pages 83-92
Abstract
In order to investigate the residual effect of different tobacco cultivars on germination and seedling growth of rapeseed, an experiment was conducted at laboratory and glasshouse during 2007 as factorial based on completely randomized design with four replications. Extracts of root and shoot from two ...
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In order to investigate the residual effect of different tobacco cultivars on germination and seedling growth of rapeseed, an experiment was conducted at laboratory and glasshouse during 2007 as factorial based on completely randomized design with four replications. Extracts of root and shoot from two different types of tobacco (Virginia and Basma) and different concentrations of extracts (0, 40 and 80%) were the treatments. Results showed that germination percentage and rate, shoot and root length in rapeseed (Hayola 401) in laboratory experiment and root and shoot length and ratio, shoot to root dry weight ratio, leaf area, seedling emergence and vigor and chlorophyll contents were significantly affected by different tobacco root and shoot extracts. According to results root extract of Virginia and shoot extract of Basma had the highest and the lowest effect in terms of mentioned traits, respectively. Among studied characters, germination rate had highly correlation with germination percentage and seedling vigor.