Response of Amended Melamine Phosphate with Different Levels of Fertilizers on Rhizobium Population and Soil Microbial Activity

The experiment was conducted under field conditions at Instructional cum Research Farm, College of Agriculture, Raipur (Chhattisgarh) during kharif season 2011-12. The data revealed that at 45 and 60 DAS treatment T2 (11.01 and 7.16 x10(3)) was recorded significantly highest rhizobium population which was at par with T9 (10.6 and 6.86 x10(3)) and T7 (9.99 and 6.24 x10(3)). However at harvest stages Treatment T2 (4.66) was observe significantly highest rhizobium population among all the treatments but it was recorded significantly at par with T9 (4.35 x10(3)), whereas lowest rhizobium population was recorded under treatment T1(Absolut control) at all the growth stages. Result recorded that Response of amended melamine phosphate on rhizosphere soil respiration was found significantly higher in treatment T9 among all the treatments, but it was found significantly at par with treatment T2 (0.367 CO2/hr/100g soil) and T7 (0.356 CO2/hr/100g soil), however lowest rhizosphere soil respiration was recorded in treatment T1 (0.183 CO2/hr/100g soil) (Absolute control) at 45 DAS. At 60, 90 and at harvest stages treatment T2 (0.523,0.467 and 0.423 CO2/hr/100g soil) was recorded significantly highest among all the treatment in soybean field. Response of amended melamine phosphate on rhizosphere soil dehydrogenase activity at different stages recorded significantly higher at 45 DAS in T9 (22.0 mu g/TPF/h/g soil) followed by T2 (20.6 mu g/TPF/h/g soil) but treatment T2 was recorded significantly at par with T7 (19.9 mu g/TPF/h/g soil). At 60 and at harvest stage treatment T2 (45.2, 28.3 mu g/TPF/h/g soil) was recorded significantly highest dehydrogenase activity among all the treatments followed by treatment T9 (44.4, 26.5 mu s/TPF/h/g soil), however, at 90 DAS dehydrogenase activity T2 (42.4 mu g/TPF/h/g soil) was recorded significantly highest among all the treatments.