Vol. 10, Issue 12 (2021)

Author(s):
B Prasanth Naik, Dr. A Lalitha Kumari, Dr. P Venkata Subbaiah and Dr. M Martin Luter

Abstract:
A field experiment entitled “soil nutrient transformations and performance of direct sown rice (Oryza sativa) as influenced by liquid biofertilizers” was conducted during kharif, 2019 at Agricultural College Farm, Bapatla, Andhra Pradesh. The results of the experiment indicated that application of different levels of fertilizers along with liquid biofertilizers significantly increased N, P and K status of the soil while their effect on soil organic carbon was non-significant. The highest organic carbon values (0.59, 0.58 and 0.56%) at maximum tillering, panicle initiation and harvest stages respectively was observed in T₆ (100% RDF + Azospirillum + PSB+ KRB). Among the different treatments, the highest available nitrogen contents (299 kg ha^-1, 290 kg ha^-1 and 278 kg ha^-1) at maximum tillering, panicle initiation and harvest stages respectively were recorded in the treatment T₆ (100% RDF+Azospirillum+PSB+ KRB) followed byT₄ (100% RDF +Azospirillum + PSB) and T₅ (100% RDF + Azospirillum + KRB) and these were on par with each other. The highest available phosphorus content (66.33g ha^-1, 62.42kg ha^-1 and 60.97 kg ha^-1) at maximum tillering, panicle initiation and harvest stages respectively was recorded in the treatment T₆ (100% RDF+Azospirillum+PSB+ KRB) followed by T₄ (100% RDF +Azospirillum + PSB) and T₅ (100% RDF + Azospirillum + KRB)) and these were on par with each other. Similar trend was noticed in the content of available potassium also. The lowest available nitrogen, phosphorus and potassium contents were recorded in the treatment T₁ (Control) at all stages.