Rice straw incorporation and integrated use of inorganic, organic and biofertilizers for sustainable lowland rice production

Date

6-2025

Abstract

Field and laboratory experiments were conducted to evaluate the decomposition rate of rice straw using Trichoderma compost activator (TCA) and assess the agronomic, soil, and economic responses to integrated nutrient management strategies. Two field trials were conducted in Quezon Province, representing irrigated lowland (Tumbaga 1, Sariaya) and rainfed lowland (Pili, Sariaya) conditions during the 2023- 2024 dry and Wet seasons. Laboratory incubation studies confirmed that Trichoderma significantly enhanced rice straw decomposition, as supported by higher COz evolution rates until day 7. Field experiments demonstrated that Trichoderma technologies combined with 75% recommended fertilizer rate achieved optimal performance in both locations, producing 4.42-4.50 t/ha yields in irrigated conditions and 3.13 t/ha in rainfed conditions while reducing synthetic fertilizer dependency by 25%. Trichoderma technologies combined with 50% recommended fertilizer rate also showed promising results. This treatment represents an excellent compromise for farmers seeking to minimize input costs while maintaining good productivity. Integrated nutrient management using 50% recommended rate plus Bio N also showed high economic returns. The study concluded that combining Trichoderma technologies or Bio N with reduced fertilizer rates (50-75% RR) maintains competitive yields while improving soil health, reducing input costs, and promoting sustainable rice production systems suitable for both irrigated and rainfed lowland conditions.

Document Type

Dissertation

Degree

Doctor of Philosophy in Soil Science

College

Graduate School (GS)

Adviser/Committee Chair

Pearl B. Sanchez

Committee Member

Jocelyn D. Labios, Michelle C. Quimbo, Pompe C. Sta. Cruz

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

En – AGROVOC descriptors

TRICHODERMA; RICE STRAW; DEGRADATION; INORGANIC FERTILIZERS; ORGANIC FERTILIZERS; BIOFERTILIZERS; IRRIGATED LAND; LOWLAND; RAINFED FARMING; CROP PRODUCTION; INTEGRATED PLANT NUTRIENT MANAGEMENT

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