New Finding in Agriculture: 5 (42)

Open Access Article

1 - The effects of drought stress on seed germination and some of morphological and physiological traits in Trachyspermum ammi
A. Baghizadeh M. Afroushte, B. Fakheri

In order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germin More

In order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germination of ajowan seeds was investigated to different levels of drought stress include osmotic potential of zero (control), - 1.5, -2, -2.5 and -3bar that prepared by PEG6000. The second experiment was same first, but in this experiment, morphological and physiological characters of ajowan in different level of drought stress were evaluated. Results of Anova at our data showed that drought stress has significant effect (p≤0/01) on germination characters such as germination percentage, germination rate, height of plumule, length of radicle, dry weight of radicle and plumule. Mean comparison of treatments showed, with increase in drought stress, all the above characters have been reduced. Morphological traits such as leaf area, fresh and dry weight of shoot and root and shoot dry weight ratio to root decreased under drought stress. Manuscript profile

Open Access Article

2 - Interaction of solarization time and plastic color on germination of Amaranthus retroflexus and Sinapis arvensis
M. H. Baeshtiagh F. Mohajeri

In order to evaluate the effect of solarization time and plastic color on germination of Amaranthus retroflexus and Sinapis arvensis in Estahban region, this study was carried out in a factorial arrangement based on RCBD with three replications. Factors were selected as More

In order to evaluate the effect of solarization time and plastic color on germination of Amaranthus retroflexus and Sinapis arvensis in Estahban region, this study was carried out in a factorial arrangement based on RCBD with three replications. Factors were selected as solarization duration at 0, 15, 30, 45 and 60 days, and plastic color at Transparent, non-transparent and dark levels. Result showed that by increasing solarization duration, the percentage of germination of the seeds of Amaranthus retroflexus and Sinapis arvensis, decreased. The lowest germination rate was observed in 60 days treatment and the highest germination percentage was observed in control treatment. Also, with increasing color plastic dullness, the germination percentage of the weed seeds decreased. According to the results of this experiment, the increase in extreme temperature under the plastic substrate caused a severe reduction in the grain, so that the use of late plastic coating caused most of the plants to disappear at these levels. Manuscript profile

Open Access Article

3 - Study of interaction of Titanium Dioxide nanoparticles and water management on weeds, physiological and biochemical characteristics of Corn (Zea mays L.)
E. Jalili F. Gangabadi M. S. Valiahdi M. Ghavami,

This experiment was conducted in Karaj as split plot in a RCBD with 3 replications in 2017. The experimental treatments included irrigation management at three levels: irrigation with surface brush, sub surface (15 cm depth), and atmospheric and backyard in the main plo More

This experiment was conducted in Karaj as split plot in a RCBD with 3 replications in 2017. The experimental treatments included irrigation management at three levels: irrigation with surface brush, sub surface (15 cm depth), and atmospheric and backyard in the main plot and irrigation management at three levels: 50, 100 and 150 mm evaporation from the pan in subplots and application of titanium dioxide nanoparticles in three levels: zero (control), 2 and 4 mg/lit in sub-sub plots. The results of this study indicated that divergence method (sub surface type) can be used to optimize the use of water resources to reduce irrigation losses and achieve high yield in corn production. Application of irrigation management of subsurface ribbon barrels along with titanium dioxide nanoparticles of four milligrams per liter in corn fields reduced 85% of weeds. Result showded that corn and weed competition reduced tissue texture and allocated photosynthetic sources to seed more than stems and corn leaves. Also, the use of titanium dioxide nanoparticles increased the activity of antioxidant enzymes and corn yields. The highest yield in this treatment was obtained at 10450 kg/ha. Manuscript profile

Open Access Article

4 - Effect of drought stress and salicylic acid on some of growth traits, photosynthetic pigments and yield essential oil of peppermint (Mentha piperita L.)
S. Fattahi Siahkamari H. Azad Ghujebigloo, A. Salehi Sardoei H. Motamedi Sharak, KH. Babaei

The current research was conducted with the aim to investigate the effect of salicylic acid on the growth traits, photosynthetic pigments and the amount of essential oil in Mentha piperita under drought stress. The factorial experiment was carried out in the form of ran More

The current research was conducted with the aim to investigate the effect of salicylic acid on the growth traits, photosynthetic pigments and the amount of essential oil in Mentha piperita under drought stress. The factorial experiment was carried out in the form of randomized complete block design and with three repetitions. Factors included irrigation round at four levels (90 (control), 75, 45, and 20% field capacity) and salicylic acid at two levels (zero (control) and 60 ppm). The investigated traits included the plant height, number of lateral branches, length of lateral branches, number of nodes, fresh and dry weight of the plant, fresh and dry weight of the stem, chlorophyll a, b and total carotenoids, and essential oil percentage and yield. Results from this experiment showed that the effect of drought stress on all studied traits was significant at the statistical level of 1%. The mutual effect of drought stress on salicylic acid hormone for the length of lateral branches, fresh and dry weight of the plant,  chlorophyll  a, b and total and essential oil percentage and yield traits was significant. Stress caused a reduction in all traits except for fresh and dry weight of the stem; and the use of salicylic acid led to the reduced effects of stress such that the highest values of these traits were obtained from 60 ppm salicylic acid. Given the mutual effects, the highest values of essential oil percentage and yield obtained from 90% of field capacity and application of salicylic acid. Overall, the application of this hormone led to the improvement of qualitative and quantitative characteristics of Mentha piperita under drought stress. Manuscript profile

Open Access Article

5 - The effect of salinity on concentration of some elements of Rice (Oryza Sativa L.) tissues and biomass in different growth stage
E. Farahmandfar F. Moradi A. Fallah

Salinity stress causes change in absorption and transformation of nutrients in rice plants. In order to determine of salinity affect in different growth stages of rice crops on the concentration of sodium, potassium, calcium and magnesium ions of  roots, stems and More

Salinity stress causes change in absorption and transformation of nutrients in rice plants. In order to determine of salinity affect in different growth stages of rice crops on the concentration of sodium, potassium, calcium and magnesium ions of  roots, stems and leaves, was carried out pot experiment in the greenhouse of rice research institute of Iran(Amol) in 2014. The experiment as a split plot factorial in base of completely random design with three replicates, with two rice varieties, hybrid rice (Dialam) and PSBRC88 as main plots,  and three levels of salinity (0, 6, 12 ds.m-1 ) with three growth stages (Tillering, Stem elongation, Flowering) as sub-plots factorial. Hydroponic culture was done in pots with 6 L Yoshida solution. The content of sodium, potassium, calcium and magnesium ions of roots, stems and leaves were measured that salinity treatments were done about 20 days for each stage. The results showed that the content of potassium, calcium and magnesium ions of roots, stems and leaves were decreased with increasing of salinity level at each growth stage. In check treatment, the highest of ions concentration was at flowering stage and the ions content of roots was always less than stems and leaves. The concentration amount of potassium, calcium and magnesium were higher in PSBRC88 variety than hybrid rice (Dialam). Therefore, PSBRC88 variety had higher ions uptake efficiency of sodium, potassium, calcium and magnesium in slat stress and had more biomass. Manuscript profile

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