جستجوی مقالات مرتبط با کلیدواژه « Sumac (Rhus coriaria L.) » در نشریات گروه « کشاورزی »

In this study, the effect of microwave drying method (at five power levels: 200, 400, 600, 800 and 1000 watts) on drying time, color change, amount of organic acids and vitamin C of sumac fruit (Rhus coriaria L.) was investigated. The experiment was conducted in a completely randomized design with three replications and the response surface methodology (RSM) was used to find the optimum points for the minimum drying time and color changes or the maximum organic acids and vitamin C during drying. The results showed that microwave drying had significant effect on the color, the amount of organic acids and vitamin C at 5% probability level but it had significant effect on drying time at 1% probability level. Among the different microwave powers, the highest and lowest organic acids were obtained at 1000 and 600 watts with values of 1.46 and 1.11 mg/100 g, respectively, and the highest and lowest vitamin C was obtained at 600 and 1000 watts with values of 0.40 and 0.26 mg/100g, respectively. The best situation for microwave drying (with the lowest drying time and color variations and the maximum phytochemicals) was obtained at 815 watts. Finally, the lowest color changes and the highest amount of organic acids and vitamin C were observed in the shade drying method.

Sumac (Rhus coriaria L.) has been naturally spread in Arasbaran forest (especially Horand region) and a remarkable amount of its fruits are exploited traditionally every year. This research tried to recognizing the habitat requirements of Rhus coriaria and the most important effective factors on its distribution. For this purpose, 36 circular samples (100 m2) in north, east and west aspects (each, 12 samples) were selected using 100 × 100 m grid by systematic sample method in natural sumac stands. The results showed that DBH, main collar diameter, height, crown diameter and crown cover means in the north aspect were significantly more than those of other aspects. Rhus coriaria included about 98% of individuals recorded in the samples. Seed origin individual’s percentage of sumac in North aspect was significantly more than east and west aspect. Slope and altitude have significant effects on quantitative and vegetative characteristics of Rhus coriaria but they don’t have any effects on origin and integrity. The average fruit weight per tree in the north aspect was significantly more than those of other aspects. Generally the results showed that northern aspect, class of height above sea level 1000-1200 m and class of slope 40-60% present better conditions to Rhus coriaria growth.