Vol. 10, Issue 12 (2021)

Author(s):
VG Salvi, RS Mane, Sayali Biradar and Bhakti Raut

Abstract:
A field experiment was conducted during Kharif season of 2019 at Central Experiment Station, Wakawali, Dr. Balsaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, Dist. Ratnagiri to study the effect of inorganic fertilizers and organic manure on microbial population, CO2 evolution and their correlation with yield of yam bean in lateritic soils of Konkan region of Maharashtra. There were thirteen treatments which were replicated thrice in randomized block design. The treatments consisting three levels of nitrogen (80,100,120 kg ha^-1), phosphorous (40, 60, 80 kg ha^-1), FYM (10, 15, 20 t ha^-1), a constant dose of potassium (100 kg ha^-1) and an absolute control treatment. The results of the experiment revealed that the application of different levels of inorganic fertilizers and organic manure exhibited significant increase in microbial population as well as CO2 evolution in soil. Significantly, superior bacterial (200.33 × 105 cfu g^-1 soil), fungal (31.33 × 103 cfu g^-1 soil) actinomycetes (113.33×105 cfu g^-1 soil) population and CO2 evolution (71.87 mg 100 g^-1 soil 24 hr ^-1) was recorded at 60 days of sowing as compared to 30 days of sowing and at harvest due to the treatment receiving the highest level of inorganic fertilizers and organic manure application @120:80:100 N:P2O5: K2O kg ha^-1 + 20t FYM ha^-1. As far as the yield of yam bean tuber was concerned, the total tuber yield and marketable tuber yield showed significant positive relationship with bacteria (r = 0.96**, 0.90**), fungi (r = 0.97**, 0.92) and actinomycetes (r = 0.98**, 0.90**) population as well as CO2 evolution (r = 0.88**, r = 0.81**) in soil, respectively.