جستجوی مقالات مرتبط با کلیدواژه "کائولین" در نشریات گروه "زیست شناسی"

Teh present study was conducted in order to evaluate teh TEMPTEMPeffects of kaolin particle film on teh quantitative and qualitative characteristics of important commercial varieties of apple trees (Golden Delicious and Red Delicious) in teh orchards of Bonab and Shahr Jadid Sahand, East Azerbaijan. dis experiment was factorial in teh form of a randomized complete block design wif 4 replications at 4 levels of thin membrane (control, 2, 4, 6%) on 2 apple varieties in 2 locations for two years. Teh year was done. Teh measured indicators included sunburn percentage, photosynthesis rate, total chlorophyll, chlorophyll b and chlorophyll a, fruit surface temperature, fruit firmness at harvest, leaf calcium and phosphorus levels, and yield. Teh results showed dat wif increasing levels of kaolin concentration in both regions and cultivars, teh amount of damage, burn percentage and fruit surface temperature decreased. Teh lowest temperature limit (37.16 degrees Celsius) in teh treatment wif 4% concentration and teh highest limit Teh temperature (40.25 degrees Celsius) was observed in teh control. Teh highest percentage of burn damage was related to teh control treatment (19.95%) and teh lowest was related to teh 4% kaolin treatment (14.2%). Total chlorophyll, chlorophyll b and chlorophyll a indices, fruit firmness at harvest, fruit calcium content, photocenter intensity and yield increased significantly wif increasing kaolin levels. Teh highest amounts of chlorophyll b and a were observed in 2% and 4% treatments, respectively, 0.97 and 1.95 mg/g of chlorophyll, and teh lowest levels of these plant pigments were observed in teh control (chlorophyll b and a, 1.28 and 58, respectively). / mg/g fresh weight). Teh highest amount of photosynthesis related to teh treatment of 6% kaolin (9.44 micromoles of CO2/m2/s) and teh lowest amount of photosynthesis was observed in teh control treatment .

In order to investigate the effect of plant density and foliar application of kaolin on rainfed wheat cultivars, a factorial-split plot study was conducted in a RCBD with four replications under rainfed conditions in Koohdasht. Plant density factor viz. 350, 500, 650 and 800 plants per square meter and cultivar factor including three dryland wheat cultivars Karim, Kuhdasht and Qaboos as factorial in main plots and kaolin foliar application in two levels of non-application and application of Kaolin was placed in sub-plots. The results showed that with increasing plant density, the amount of polyphenol oxidase and peroxidase antioxidants (26.2% and 9.1%, respectively) and grain carbohydrates (11.9%) increased, but the amount of grain protein (4.3%) decreased, at the highest density compared to the control. The amount of nitrogen, potassium and iron in the grain decreased with increasing plant density. The highest amount of phosphorus, zinc and grain protein belonged to Qaboos cultivar, so that in Qaboos cultivar the amount of phosphorus was 6.4% and 1.9%, respectively, the amount of zinc was 4.6% and 1.3%, respectively, and the amount of protein was 2.5% and 0.3%, respectively, more than Karim and Kuhdasht cultivars. Foliar application of kaolin increases the uptake of all essential elements studied in the shoot and the amount of nitrogen, phosphorus, iron, zinc and carbohydrates in the grain; but reduces the antioxidants of the shoot and the amount of potassium and protein in the grain compared to the non-use of kaolin. In total, Qaboos cultivar at a density of 500 plants per square meter with the use of kaolin was recommended as the best treatment for grain production and enrichment at Kuhdasht region.

In an orchard experiment, the effects of foliar application of kaolin, potassium, phosphorus and their different combinations were examined on photosynthesis parameter 8-years-old pistachio trees cv.Kalle-ghouchi in 2016. There were ten treatments, including two rate of P (1 and 2%), two rates of K (1.5 and 3%), kaolin 5%, kaolin 5%+ P 1%, kaolin 5%+P 2%, kaolin 5%+ K 1.5%, kaolin 5%+ K 3% and control (use of distilled water). Foliar application of above treatment were performed in mid Jane when embryo growth is started (the maximum demand for photoassimilates). Photosynthetic parameters (photosynthesis and transpiration rate, stomatal conductance and sub stomatal CO2 concentration), chlorophyll fluorescence parameters (Fv/Fm and PI), photosynthetic pigments (chlorophyll a, b and total and total carotenoids) were measured in 5 stages (the first stage was one day after treatment and the others  were performed with one week interval). The results showed that non of treatments could improve photosynthesis parameters expect Ci while chlorophyll fluorescence parameters were improved by kaolin treatments and photosynthetic pigments were increased by most of experimental treatments. The result also showed that photosynthesis and transpiration rate and stomatal conductance were increased with time and sub-stomatal C02 concentration was decreased. Chlorophyll fluorescence indices and photosynthetic pigments were also increased with time. Totally, the effect of experimental treatments on photosynthetic parameters was under our expectation.