ارزیابی اثر غشاء نازک کائولین بر ویژگیهای کمی و کیفی ارقام سیب (Malus domestic).

The present study was conducted to evaluate the effects of kaolin particle film on the quantitative and qualitative characteristics of important commercial varieties of apple trees (Golden Delicious and Red Delicious) in the orchards of Bonab and Shahre Jadide Sahand, East Azerbaijan. This experiment was randomized complete block design with 4 replications at 4 levels of thin membrane (control, 2, 4, 6%) on 2 apple cultivars (Golden Delicious and Red Delicious) in 2 locations for two years. The 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. The results showed that with increasing levels of kaolin concentration in both regions and cultivars, the amount of damage, burn percentage and fruit surface temperature decreased. The lowest temperature limit (37.16 degrees Celsius) in the treatment with 4% concentration and the highest limit. The temperature (40.25 degrees Celsius) was observed in the control. The highest percentage of burn damage was related to the control treatment (19.95%) and the lowest was related to the 4% kaolin treatment (14.2%). Total chlorophyll, chlorophyll b and chlorophyll an indices, fruit firmness at harvest, fruit calcium content, photosynthesis rate and yield increased significantly with increasing kaolin levels. The highest amounts of chlorophyll b and a were observed, respectively, 0.97 and 1.95 mg per gram of fresh weight, and in the treatment of 2% and 4%, and the lowest amount of these plant pigments was observed in the control (chlorophyll b and a, respectively, 1.28 and 58/mg/g fresh weight). The highest amount of photosynthesis related to the treatment of 6% kaolin (9.44 mM CO2 m^-2 g^-1 ) and the lowest amount of photosynthesis was observed in the control treatment (7.92 mM CO2 m^-2 g^-1 ). The highest amount of calcium, phosphorus and yield (respectively 55/ 1 mg/kg, 0.154 mg/kg, 80.62 mg/kg) in the 4% kaolin treatment and the lowest of these values in the control (1.55 mg/kg, 0.154 mg/kg respectively) per kg, there was 67.67 kg) and there was no significant difference between the two regions and cultivars in this respect. [ABSTRACT FROM AUTHOR]