Promoting the use of agricultural waste is one of the newly prepared water and environment
friendly agriculture strategies in the Kingdom of Saudi Arabia (KSA). The objective of this
research was to study the efficiency of cultivating oyster mushroom (Pleurotus ostreatus) on date
palm wastes mixed with other agricultural wastes available in KSA. Four agricultural wastes were
mixed with date palm leaves at different ratios, with two supplements and three spawn rates were
used. Wheat straw mixed with date palm at ratio of 25 (date palm): 75 (agro-waste) showed the best
results in most of the parameters measured. Corn meal was superior over wheat bran as a
supplement in all treatments. Parameter values increased with the increase of the spawn rate of
P. ostreatus. Treatments with date palm leave wastes contained higher carbohydrates and fibers.
No significant differences were found among the fruiting bodies produced on the different agrowastes
studied for the different proximates analyzed. Analyses of metal concentration showed that
potassium was the highest in all the treatments tested followed by Na, Mg, Ca, and Zn. This is the
first study that reported the success of growing oyster mushroom on date palm leaf wastes mixed
with other agro-wastes obtainable in KSA.