The best replacement for sodium nitrate is sodium nitrite.

The best alternatives to sodium nitrate are rated as following:
★★★★★  sodium nitrite
★★★★  potassium nitrate
★★  celery juice
★  nitrite
★  sodium phosphate
★  sodium nitrate
★  sodium chloride
  ammonium nitrate
  sodium citrate

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Speaking about sodium nitrate, one probably shouldn't forget about potassium chloride.

Other search terms related to sodium nitrate and their ratings are:
★★★★★ potassium chloride
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sodium nitrate
sodium nitrite
potassium nitrate