The soil must be well ventilated to supply nitrogen for the nitrogen-fixing germs and oxygen for the nitrifying germs.
nitrogen-fixing bacteria also add to the stores of nitrogen compounds.
Such plants as are hosts for the nitrogen-fixing bacteria are planted early in the season.
This they do not of their own power but through the aid of very minute plants called bacteria or nitrogen-fixing germs.
To do their work well the nitrogen-fixing germs and the nitrifying germs require certain conditions.