Response of Super Bureau to varying concentrations of two strains of Azospirillium in Tarlac, Philippines.
1996
Aromin F.B. | Adion I. | Sebastian A. | Rasco E.T. Jr.
To verify initial findings on biofertilizer technology, on-farm trials were conducted for the second straight year to determine the effect of varying concentrations of two strains of Azospirillum (BSS 202 and SP-7) on the growth and yield of cv. Super Bureau under normal soil and lahar conditions in Tarlac [Philippines]. Super Bureau, the most popular variety in Tarlac at present, was previously reported as weakly responsive to Azospirillum. This study is a continuation of the series of trials on the effect of Azospirillum on sweetpotato production which was initiated in 1992. The growth and yield of Super Bureau was not significantly enhanced by the application of either strains of Azospirillum over the control. Likewise Azospirillum concentration did not significantly influence these parameters. In all cases, application of inorganic fertilizer produced more vigorous plants and numerically higher yield than the application of Azospirillum, even at the highest concentration. Positive effects of Azospirillum was more visible under conditions of sufficient soil moisture. It was recommended that future trials on the use of Azospirillum should focus on responsive varieties, such as 88WS623, and only in irrigated fields.
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