There will be undoubtedly reduced decomposition of rice straw in soil treated with NaCl, simply because of the arrestation  in microbial activity , unless soil is naturally saline . In such saline soils , there will be  seggregation in microbial diversity ( Preponderance of one microbial community over other microbial community when soil environment changes from normal soil condition to saline soil condition  ) ,characteristic of saline soils . So , such microbes from saline soil conditions probably could be more effective to trigger the decomposition of rice straw.

In my opinion, for hydrolyzing one must ensure a pH disturbance in the medium. When water is dissociated, it releases H+ and OH- ions. These ions are responsible for causing decomposition of something/substrate.

NaCl is a neutral salt of HCl and NaOH. It does not trigger radicals imbalance.

I do not know the consequences, but your hypothesis may include an alkaline salt such as NaHCO3. 

This may further solubilize silica portion in rice straw and ease degradation.

Regards,

MKD 

Dear Dr. Reddy,

(1). Salinity effect on straw decomposition has been found to depend on soil water content. Applying two levels of water (17% and 25% w/w) in a soil, the  effect (of salinity) was found to be greater at low (17%) and smaller at high (25%) water content.

(2). The effect of salinity on straw decomposition also depended on the decomposition phase. Compared with non-saline soil, salinity decreased straw decomposition during first 1-3 days, increased during 4-32 days and caused variable effect thereafter.

(3). Then type of salinity, viz. chloride and sulfate salinity, differed in their effect on straw decomposition.

I hope you find this information useful.

Reference:

Xiaogang Li et al. (2006) Biol. Fertil. Soils 42(4):366-370

The below mentioned researcher has many articles on rice straw. Happy new year.

https://www.researchgate.net/profile/Yehia_Fahmy