How many kilograms of nitrogen can 1 mu of soybeans fix? A full analysis of nitrogen fixation capacity

1. How much nitrogen can 1 mu of soybeans fix?

Field trials have determined that 1 mu of soybeans can fix about 8 kilograms of nitrogen, equivalent to applying 18 kilograms of urea. Because soybeans have symbiotic nitrogen-fixing rhizobia, through the action of rhizobia they can fix gaseous nitrogen from the air, so generally no nitrogen fertilizer needs to be applied. It is estimated that the rhizobia of one mu of soybeans can each year convert nitrogen gas from the air into nitrogen elements usable by plants, roughly equivalent to the nitrogen in 30 kg of ammonium sulfate.

2. Application techniques for soybean rhizobia

Using rhizobia in soybean production is a mature and widely used technique that can greatly increase the nitrogen fertilizer needed in soybean production and supply sufficient nitrogen elements. Soybean rhizobia come in two types, liquid and solid. Solid rhizobia are used by seed dressing or soil application, while liquid rhizobia are used by clean seeding. Soybean rhizobia can also be added during seed coating, but care must be taken that the coating agent and the rhizobia strain match each other, and the activity of the rhizobia must not be inhibited by the pesticide effect of one planting season. For many years, we have consistently treated the use of rhizobia in soybeans as a key technique for resisting continuous cropping and increasing yield, and certain results have been achieved.