benoticed that the highest pulp reject (12.3%) and lignin content of the produced pulp (4.6%) were for J. procera samples which may be due to its high lignin content (28%). The highest screened pulp yield of wheat straw (46.4%) without rejected pulp could be attributed to its low lignin content (17.5%) and low density (170 kg m3 ) which makes it easy to cook as compared to other two materials. This result can also be confirmed by the inverse relationship between density and screened pulp yield as illustrated in Fig. 2. Increasing the density of the raw materials resulted in decrease in the screened pulp yield, while the total pulp yield was increased. The density of WS was 170 kg m3 , while the mean value of J. procera was 630 kg m3 . The small percentage of rejected pulp and kappa number of date palm midribs and wheat straw indicated that the soda-AQ pulping process effective to defibibrate and produce pulp from the raw materials. Fig. 3 depicts that there was significant correlation (P < 0.01) between the total pulp yield and specific wood consumption with a negative coefficient (r = 0.87). This suggests that more wood was needed to produce the same weight of pulp in the case of wheat straw, compared to either DPM or J. procera. Such finding is also in agreement with those determined by Sable et al. [25] and Francis et al. [31]. It appears that the major drawback to commercial use of wheat straw and date palm is their low basic density. Therefore for a given digester volume J. procera chips with average density of 630 kg m3 would produce more pulps by weight as compared to either date palm midribs or wheat straw. Tab