Plant growth promoting activities of phosphate solubilizing bacteria isolated in the Ricefield of Rizal, Nueva Ecija [manuscript]
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Date
2020
Authors
Rodel B. Cabali
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Abstract
The study aimed to isolate, characterized and identify the phosphorus solubilizing bacteria on the rice field of Rizal, Nueva Ecija. Using the Randomized Complete Block Design (RCBD), three isolates with plant growth promoting activities were tested in rice using the following treatments: T1-Uninoculated (Control), T2- Inoculated with Pectobacterium corotovorum, T3- Inoculated with Serratia marcescens , T4- Inoculated with Yersinia frederiksenii, T5- Recommended rate of inorganic fertilizer (N,P,K), T6- 50% Phosphorus with Pectobacterium carotovorum + (Full recommended rate of N.K), T7-50% Phosphorus with Serratia marcescens + (full recommended rate of N,K) and T8- 50% Phosphorus with Yersinia frederiksenii + (Full recommended rate of N,K), and T9- 50% Phosphorus alone.
Seventeen P solubilizing bacteria were isolated from the rice field of Rizal, Nueva Ecija. Three potential isolates with growth promoting activities were identified, namely: Pectobacterium carotovorum, Serratia marcescens and Yersinia frederiksenii. Said isolates were tested for their growth-promoting activities in rice using seedling vigor and pot experiment.
Result of the seedling vigor showed that the uninoculated plants produced highest root and shoot length compared to the plants inoculated with Pectobacterium carotovorum, Serratia marcescens, and Yersinia frederiksenii. In the pot experiment, the inoculated with 50% Phosphorus with Pectobacteriaum carotovorum + (full recommended rate of N, K), T7- 50% Phosphorus with Serratia marcescens + (Full recommended rate of N,K), T8- 50% Phosphorus with Yersinia frederiksenii + ( Full recommended of N,K), produced root and shoot weight that are comparable with those applied with inorganic fertilizer and inoculated with Pectobacterium carotovorum, Serratia marcescens and Yersinia frederiksenii only.