Organic and bio-fertilizers on rice sheath blight severity and economics of their use By:Sinohin, Alfredo M., 1951

Date

4-1995

Abstract

Field experiments were conducted to compare the effect of organic and bio-fertilizers on rice sheath blight severity, agronomic character, grain yield and yield components of two rice varieties, BPI Ri-10 and PSB Rc-4. Likewise, the production cost and return of rice farming using different fertilizer treatments were compared. The experiments were conducted under irrigated lowland condition during the dry season (DS) and wet season (WS).

Regardless of the season and variety, all fertilizer treatments did not influence disease severity, tiller count and plant height.

All fertilizer treatments, except Azospirillum T1 and Biogreen, increased grain yield of BPI Ri-10 during the DS. All treatments did not affect the grain yield during the WS. With PSB Rc-4, Azospirillum T1 - treated plants outyielded Azolla - Azospirillum T2 - Biogreen treated plants and the untreated control during the DS. Azospirillum T1 - Azospirillum T2 - and inorganic fertilizer treated plants outyielded the untreated control during the WS.

Inorganic fertilizer, Azospirillum T2, Biocore and Compost increased the panicle count per hill of BPI Ri-10 during the DS, while only inorganic fertilizer influence the panicle count during the WS. On the other hand, Azolla inorganic fertilizer, Compost and Biogreen increased the panicle count per hill of PSB Rc-4 during the DS. During the WS, all treatments increased the panicle count. Azospirillum T1 produced the highest count.

Dry season planting of BPI Ri-10 indicated the profitability of using Biocore, Biogreen, Azospirillum T2 and Azolla with the computed ROI of 42.02% , 37.60% and 32.26%, respectively. The entreated control gave the highest ROI (47.34%). During the WS, PSB RC-4 showed to be more profitable to plant regardless of the fertilizer treatment.

Generally, the result indicated that organic and bio-fertilizers are techically feasible and economically viable comparable to inorganic fertilizer despite their slow-acting nature. In the long-run, substituting organic and bio-fertilizers for chemical/inorganic fertilizer implies social benefits through reduced pollution from run-off and improvement in soil quality and crop productivity.

Document Type

Dissertation

Degree

Doctor of Philosophy in Plant Pathology

College

Graduate School (GS)

Adviser/Committee Chair

Delfin B. Lapis

Committee Member

Blanda R. Sumayao, Manolo B. Castillo, Romulo G. Davide

Language

English

LC Subject

Rice sheath blight

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 1995 P57 S56

Notes

Doctor of Philosophy (Plant Pathology)

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