Mexican scientists have developed a non-polluting bio-fertilizer suitable for crops such as corn, sorghum, wheat, and onions, and began mass production after two years of trials. Scientists from the National Center for Nitrogen Fixation at the Autonomous University of Mexico stated that application of this biological fertilizer can increase the yield of crops but will not pollute the soil. This fertilizer is bred from a strain of bacteria that promotes the growth of crops. At present, scientists are guiding manufacturers to scale production. It is reported that in 1999 Mexican scientists applied this fertilizer to 50 hectares of corn and wheat fields. The corn and wheat grown on these fields increased by an average of 26%. Last year, they expanded the area of ​​the farmland where this fertilizer was applied to 150 hectares, and they also obtained a good harvest.