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Gum ammoniacum (Dorema ammoniacum D. Don) is one of the most important food,   industrial and medicinal plants of Iran which is mainly distributed in   semi-arid and desert areas. It is endangered due to superfluous and   unsustainable harvesting methods. The objective of this study was to evaluate   the possibility of crop cultivation in terms of dryland farming and the best   operation method for collecting gum resin. For this purpose, the effects of   different scarification methods (traditional, concave and staircase) and   cut-off frequencies (5, 10 and 13 times) on gum yield of the five-year-old   plants were studied at Toroq farm in Mashhad. The treatments were studied   under a split plot structure in time experiment which was arranged in a   completely randomized design with three replications. The rate of the root   gum production and the rate of plant survival in the years after the   withdrawal were measured, and finally the data were analyzed. Results showed   no significant differences among cutting methods at p<0.05. The yield of gum   was affected by times of harvesting and the highest yield was observed   (p<0.01) in 13 cut-off times with 31.67 g/plant. The lowest gum yields were   seen in 5 cut-off times with 5.84 g/plant. The traditional cutting method   destroyed crown buds and caused the death of the plant (p<0.01). Reasonable   gum yields and plant regeneration rates were obtained with the use of stairs   method which is an easy method to be applied by the farmers or beneficiaries

The possibility of crop cultivation and utilization of edible gum from herb (Dorema ammoniacum D. Don) in dryland farming