rafael castro-fuentes department of physiology, school of medicine, university of la laguna, 38320 tenerife, spain. rosario socas-pérez department of cognitive psychology, school of psychology, university of la laguna. 38205 tenerife, spain.

k. zarafshani agricultural extension and education, agricultural and natural resource faculty, razi university, kermanshah, islamic republic of iran. sh. ghasemi agricultural extension and education, agricultural and natural resource faculty, razi university, kermanshah, islamic republic of iran. e. houshyar department of biosystems and engineering, jahrom university, jahrom, p. o. box: 74135-111, islamic republic of iran. r. ghanbai department of rural development, college of agriculture, lorestan university, lorestan, islamic republic of iran. s. van passel centre for environmental sciences, hasselt university, belgium. hasselt university, belgium. h. azadi centre for environmental sciences, hasselt university, belgium.

Azita TAJADDINI, M. ZERAFAT ANGIZ L.,