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Showing 5 results for Chlorophyll Index
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Volume 8, Issue 32 (3-2017)
Abstract
In order to investigate the effect of superabsorbent polymer on yield and some physiological characteristics of spring maize under water deficit tension, this experiment was conducted as split plots in a randomized complete blocks design with three replications in a field located in Hamidieh. Experiment treatments included irrigation intervals (60, 90 and 120 millimeter evaporation from evaporation pan class A) in the main plots and different amounts of superabsorbent (zero, 75 and 150 kilogram per hectare) in subplots. The results showed that the effect of irrigation intervals and superabsorbent was significant on grain yield, yield components, chlorophyll index and relative content of leaf moisture. The highest grain yield and yield components and chlorophyll index was obtained from treatment of 60 millimeter evaporation and 150 kilogram per hectare of superabsorbent. The highest grain yield by an average of 606 gram per square meter was obtained from treatment of 60 millimeter evaporation. Drought tension caused a significant decrease in chlorophyll index and leaf relative water content. In general, the consumption of 75 kilogram per hectare superabsorbent under mild tension conditions resulted in compensation for damage caused by tension.
, , ,
Volume 8, Issue 32 (3-2017)
Abstract
In order to investigate the yield, yield components, growth and physiological indices of maize hybrids in response to Nitroxin bio fertilizer application containing inoculant Azotobacter choorcoccum and Azospirillum brasilenese bacteria, in addition to the amounts of nitrogen fertilizer, this experiment was performed as split plots based on randomized complete blocks design with four replications. Main plots consisted of combining four levels of fertilizers treatment (100 percentage chemical fertilizer, 75 percentage chemical fertilizer + 100 percentage bio fertilizer, 50 percentage chemical fertilizer + 100 percentage bio fertilizer and 25 percentage chemical fertilizer + 100 percentage bio fertilizer) and sub plots included maize hybrids (Single Cross 704 hybrid, Mobin hybrid and Karoun hybrid). Results showed that maximum biological yield, grain yield, one thousand grain weight and ear length were belonged to combined use of 50 percent nitrogen fertilizer plus 100 percent Nitroxin bio fertilizer in Karoun hybrid. Single Cross 704 hybrid in the amounts of 100 percent chemical fertilizer application, had the highest number of grain per ear, number of grain per row, inoculation percentage and lowest length of ear without grain and percentage of ear without grain. The maximum length of ear without grain and percentage of ear without grain was obtained from treatment 75 percent nitrogen chemical fertilizer application plus to 100 percent bio fertilizer and Mobin hybrid. The investigation of results showed no significant difference among fertilizer treatments, as well as hybrids in terms of chlorophyll index. However, Karun hybrid had a higher chlorophyll index than two other hybrids.
Sajad Mosavi, Saeed Zakernejad,
Volume 12, Issue 45 (4-2020)
Abstract
In order to investigate the effect of nitrogen management on morphophysiological traits, yield and yield components of corn hybrids, the present experiment was carried out in a split plots arrangement in a randomized complete blocks design with three replications in a field located in Ahvaz city during the crop year 2016-2017. Experimental treatments consisted of nitrogen fertilizer management at three levels of 100 percent urea, 100 percent Nitrokara and 50 percent urea and 50 percent Nitrokara in main plots and different maize hybrids at three levels including Karon, Mobin and Single Cross 704 in sub plots. The results showed that nitrogen consumption management had a significant effect on plant height, ear length, yield, seed number per row, one-thousand grain weight and chlorophyll index and nitrogen consumption efficiency. Also, the studied hybrid type was significantly different in plant height, yield and yield components and nitrogen consumption efficiency. Among the investigated hybrids, Single Cross 704 was superior to other investigated hybrids, so that in terms of plant height, grain yield, number of seeds per row, weight of one thousand seeds and efficiency of nitrogen consumption was allocated the highest rate. In examining the interaction effect of nitrogen consumption management and corn hybrids, grain yield was significant at one percent probability level. The highest grain yield with an average of 6.3 tons per hectare was related to 50 percent urea treatment and 50 percent Nitrokara and Single Cross 704 cultivar. Regarding the results, it seems that the combination of chemical fertilizer with bio fertilizer could increase the yield on hybrid Single Cross 704 and Mobin hybrid had less fertility.
Seyed Mohammad Amin Sobhani, Mojtaba Alavifazel, Mohammadreza Ardakani, Adel Modhej, Shahram Lak,
Volume 14, Issue 53 (4-2022)
Abstract
Present study was carried out to evaluate the effects of different amounts of nitrogen, biochar and mycorrhiza on yield and some morphophysiological traits in wheat in 2016-17 and 2017-18 crop years in Omidiyeh city insouthwestern of Iran. The experiment was conducted as a factorialin a randomized complete block design withfour replications. Experimental factors was included using of pure nitrogen amount at four levels of urea fertilizer (46% nitrogen), respectively, no fertilizer, 50, 100 and 150 kg N ha-1, mycorrhizal fungi at two levels including use and non-use of Glomus intradiaces and biochar obtained from plant biomass and agricultural wastes as soil modifiers at three levels of non-use and 4 and 8 ton ha-1. Triple interaction of different amounts of nitrogen with biochar and mycorrhiza on biological yield, grain yield, radicle length, stem length, chlorophyll index and carbohydrate percentage were significant at 1% probability level. In this study, biochar application with nitrogen fertilizer in plants inoculated with mycorrhizal fungi had better effects on all traits than biochar application, nitrogen fertilizer and mycorrhiza alone. The highest grain yield (27%), carbohydrate (15%), chlorophyll index (34%) and stem length (28%) were obtained from application of 150 kg N/ha with 4 and 8 t ha-1 biochar and mycorrhizal application. The results showed that the highest percentage of protein was obtained from mycorrhiza application, which showed a significant increase of 5% compared to control plants. Generally, based on the results, application of 150 kg N/ha and 4 ton/ha biochar in plants inoculated with Mycorrhiza was selected as the best experimental treatment.
Mr Raouf Seyed Sharifi, Mi Saber Seifamiri, Mr Hamed Narimani,
Volume 14, Issue 55 (1-2023)
Abstract
Drought stress is one of the most severe environmental stresses which is a significant role to yield reductions in arid and semi arid. In this regard, the application of silicon in combination with microelements such as iron is a recent, innovative strategy to overcome the damaging effects of drought. So, in order to study the effect of nanoparticles foliar application (iron and silicon) on yield, grain filling components and some physiological traits of safflower under rained and supplementary irrigation conditions, an experimental as factorial was conducted based on randomized complete block design with three replications at the Agricultural Research Station of Ardabil (Alarouq) in 2021-2022. The experimental factors were included irrigation levels (no irrigation or rainfed condition as control, supplementary irrigation at 50% heading-bud and flowering stages according with 55 and 65 BBCH code respectively) and nanoparticles foliar application (foliar application with water as control, foliar application of 1 g.L-1 nano iron oxide, 50 mg.L-1 nano silicon, foliar application 0.5 g.L-1 of nanoiron oxide and 25 mg.L-1 nano silicon). The results showed that nanoparticles foliar application of iron and silicon under supplementary irrigation conditions at the heading-bud stage increased chlorophyll index (35.44%), relative water content (44.25%) and stomatal conductance (32.93%), rate and grain filling period (7.47 and 36.33% respectively), the number of grain per bud (45.06%), 1000 grains weight (53.06%) and grain yield (43.77%) in comparison with no foliar application of nanoparticles under rainfed conditions. Based on the results of this study, it seems that foliar application of nanoparticles and supplementary irrigation could be utilized as a rapid, easy and effective approach to reduce drought-induced damages on safflower under rainfed conditions due to improving of grain filling components and some physiological traits (such as chlorophyll index, relative water content and stomatal conductance).
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