Formation of symbiotic apparatus and nitrogen fixing activity within lucerne when applying various forms of nitrogen fertilizers

摘要

Vegetative experiments have shown that the application of 0.25 of nitrogen normal of carbon-ammonium salts (CAS) stimulated nodule formation by 5 to 7 days comparing with the variant of ammonium saltpeter. It has been found that in comparison with the similar variant with NH_4NO_3, the use of 0.25 or 0.5 concentrations of the normal, essentially increased the quantity and the mass of lucerne root nodules as well as 1.6 to 4 times raised nitrogen fixing activity during vegetation up to the stage of flowering initiation. The use of 0.25 nitrogen normal of CAS resulted in 10 to 19.5 % reliable addition of lucerne green mass yield.