Effect of biochar from coconut and rice husk on the growth of brassica rapa linn. (pechay tagalog)/ Gerald S. Lachica, Dianne T. Mejorada, Rizelle Aleli M. Tongcua, amd John Joshua M. Torres.--

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Lachica, Gerald S [author]

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BTH RB 37 L33 2025

Dissertation note: College Of Science.-- Bachelor of applied science in laboratory technology: Technological University of the Philippines, 2025. Summary: The aim of this study was to investigate the effects of biochar derived from coconut (Cocos nucifera L.) and rice (Oryza sativa L.) husks on the growth of Brassica rapa L., commonly known as Pechay Tagalog. Biochar was synthesized through pyrolysis, with coconut husk biochar (CHB) produced at 325°C for 3 hours and rice husk biochar (RHB) at 550°C for 30 minutes. The biochar was then activated using phosphoric acid to enhance its porosity and nutrient retention capabilities. The activated biochar was mixed with different soil types-loam, clay, and silt-at concentrations of 5%, 10%, and 15% (w/w). Pechay seeds were planted in these biochar-amended soils and monitored for 30 days. The results showed that the application of biochar significantly improved soil conditions and nutrient content, leading to enhanced plant growth parameters. Pechay plants in biochar-treated soils exhibited greater height, with the highest growth observed in clay soil treated with coconut husk biochar and 5% loam soil treated with combined biochar, both reaching up to 9.5 cm. The optimal concentration for plant growth was determined to be 5% combined biochartreated loam soil, which provided the best balance of nutrient availability and resulted in plants that were 9.5 cm tall. These findings suggest that biochar derived from coconut and rice husks can substantially improve soil fertility and plant productivity.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Date due	Barcode
Bachelor's Thesis COS	TUP Manila Library	Thesis Section-2nd floor	BTH RB 37 L33 2025 (Browse shelf(Opens below))	c.1	Not for loan		BTH0006344

Bachelor's thesis

College Of Science.--
Bachelor of applied science in laboratory technology: Technological University of the Philippines,
2025.

Includes bibliographic references and index.

The aim of this study was to investigate the effects of biochar derived from coconut (Cocos
nucifera L.) and rice (Oryza sativa L.) husks on the growth of Brassica rapa L., commonly known
as Pechay Tagalog. Biochar was synthesized through pyrolysis, with coconut husk biochar (CHB)
produced at 325°C for 3 hours and rice husk biochar (RHB) at 550°C for 30 minutes. The biochar
was then activated using phosphoric acid to enhance its porosity and nutrient retention capabilities.
The activated biochar was mixed with different soil types-loam, clay, and silt-at concentrations of
5%, 10%, and 15% (w/w). Pechay seeds were planted in these biochar-amended soils and
monitored for 30 days. The results showed that the application of biochar significantly improved
soil conditions and nutrient content, leading to enhanced plant growth parameters. Pechay plants in
biochar-treated soils exhibited greater height, with the highest growth observed in clay soil treated
with coconut husk biochar and 5% loam soil treated with combined biochar, both reaching up to
9.5 cm. The optimal concentration for plant growth was determined to be 5% combined
biochartreated loam soil, which provided the best balance of nutrient availability and resulted in
plants that were 9.5 cm tall. These findings suggest that biochar derived from coconut and rice
husks can substantially improve soil fertility and plant productivity.

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