جستجوی مقالات مرتبط با کلیدواژه « zinc sulfate » در نشریات گروه « منابع طبیعی »

The use of low irrigation regimes by saving water consumption can help as a water management solution to increase the cultivated area and also determine the optimal cultivation pattern. The importance of oil products such as safflower has increased in recent years in the world. In general, safflower is produced in relatively dry marginal lands with low input. Efforts are being made to improve the yield and seed quality of this plant through the development of new genotypes and agricultural practices around the world. But the fact is that drought also affects the growth and performance of this plant. Zinc plays an important role in seed and biomass production, chlorophyll production, pollination process and even plant germination.

The purpose of this experiment was to investigate different levels of irrigation regime and foliar application of zinc and manganese sulfate in the research farm of Saravan Education Complex as a split plot in a randomized complete block design with three replications. The main plot included full irrigation, cut-off of irrigation at the stem stage and cut-off of irrigation at the flowering stage, and the sub-plot included three levels of foliar application with zinc sulfate (three per thousand), manganese sulfate (three per thousand) and without foliar application (control). The harvest was done manually, depending on the time of full processing, from the end of May to the beginning of June 2019. In order to evaluate the yield, the plants were harvested after removing the margins and after beating and separating the seeds, the yield was measured. The dry matter of plant leaves was also measured by collecting the leaves of three plants in each plot; Thus, by placing the collected leaves in an oven at 75°C for 48 hours and calculating the average leaf weight of three plants, the leaf dry matter was obtained. Analysis of data variance was done using SAS software (9/1 version) and mean comparisons were done at the five percent probability level using the LSD test.

The results showed that the cut-off of irrigation in the stem and flowering stages reduced number of days up to heading, number of days up to 50% flowering and the number of days up to maturity irrigation than full irrigation. Also, interruption of irrigation in stem and flowering stages compared to full irrigation conditions significantly reduced RWC and significantly increased electrolyte leakage. Foliar application with zinc sulfate compared to manganese sulfate and no foliar application caused a significant increase of 0.53 and 2.31 percent in number of days to heading, 1.71 and 2.54 percent in number of days up to 50% flowering and 0.52 and 1.64 percent number of days up to maturity, respectively. Foliar application of zinc sulfate and manganese sulfate significantly increased RWC and decreased significantly electrolyte leakage compared to no foliar application. At each level of irrigation regime, foliar application significantly increased seed yield, which was more effective in zinc sulfate treatment than manganese sulfate.

In general, full irrigation and foliar application of zinc sulfate is recommended for safflower cultivation in Saravan climate. In general, the cut-off of irrigation in the stages of stem growth and flowering caused a sharp decrease in grain yield in safflower plants compared to full irrigation conditions. Considering the high ambient temperature in the study area, it seems that the risk of under-irrigation in safflower cultivation in this area is very high and therefore it is recommended to carry out full irrigation in safflower cultivation in this area. Also, due to the alkalinity of the soil in dry areas and the non-absorbability of zinc and manganese elements by the plant and the positive effects of these elements in relation to the defense and photosynthesis system of the plant (especially zinc sulfate), foliar spraying with zinc sulfate for safflower in conditions Saravan weather is recommended.

In order to investigate the effect of foliar application on some physiological indicators of growth of barley cultivars, a study in the form of split plots in the form of complete randomized block design with three replications was performed at Kabutar Abad Agricultural Research Station in Isfahan in 2017-2018 cropping year. Treatments included five levels of foliar application ie: no foliar application, zinc sulfate, potassium sulfate, salicylic acid and superoxide dismutase in the tillering phase with an interval of seven days and in three turns, in the main plots and cultivar factor including Goharan, Mehr and Armaghan were placed in the sub-plots. Irrigation was complete and limited. The results showed that foliar application of zinc sulfate increased the leaf area index (50%), relative growth rate (11%), leaf area ratio (54%) and grain yield (18%) compared to the control and the highest leaf area index and leaf area ratio were obtained by the Armaghan cultivar. The highest total dry matter (1027 g.m-2) content and crop growth rate (24.17 g.m-2.day-1) were obtained by salicylic acid and the highest net absorption rate (10.99 g.m-2.day-1) was obtained by control solution. During the growing season, the highest amount of total dry matter, crop growth rate, net absorption rate and relative growth rate were produced by Goharan cultivar compared to other cultivars, which indicates the optimal use of environmental conditions and higher yield production.

In order to study effects of seed priming and foliar application of nano particle and zinc sulfate on yield and yield components of safflower, an experiment was carried out  based on RCBD  with four replications in Islamic Azad University, Arak branch, in  during 2013. Treatments composed of  without priming (control) and eleven  treatment compound as seed priming, foliar application, seed priming along with foliar application of  zinc sulfate and nano particle of zinc and seed priming with distillate water . The results showed that seed priming with distillate water and different sources of zinc increased the number of capitulum per plant as compared to control. Seed priming with distillate water and different methods of zinc sulfate application could be increased the 100 seed weight compared to nano particle of zinc. The maximum of number of grain per plant was obtained from seed priming with zinc sulfate treatments alone or along with foliar application and seed priming with 300 mg.L-1 nano particle of zinc. Seed priming with nano particle and zinc sulfate alone or along with foliar application increased grain yield compared with control. The maximum of grain yield equal to 2853.3 kg.ha-1 was observed from seed priming with 600 mg.L-1 along with 2 g.L-1 zinc sulphate.In general, the results showed thatseed priming with 300 mg.L-1 nano particle  or seed priming with 600 mg.L-1 along with 2 g.L-1  zinc sulphate can obtain acceptable product