Wastewater from washed rice water as plant nutrient source: current understanding and knowledge gaps

Abba Nabayi, . and Teh Christopher Boon Sung, . and Tan Ngai Paing, . and Tan Ali Kee Zuan, . Wastewater from washed rice water as plant nutrient source: current understanding and knowledge gaps. pp. 1347-1369. ISSN 2231-8526

A significant wastewater source in every household is washed rice water (WRW) because it contains leached nutrients (from washing the rice prior to cooking) that could be used as fertilizer. The paper reviewed the current understanding of the potential use of WRW as a plant nutrient source. WRW was shown to increase vegetables growth such as water spinach pak choy lettuce mustard tomato and eggplant. Different researchers have used various amounts of WRW and their results followed a similar trend: the higher the amount of WRW the higher the plant growth. WRW has also been used for other purposes such as a source of carbon for microbial growth. WRW from brown rice and white rice had nutrients ranging from 40-150 43-16306 51-200 8-3574 36-1425 27-212 and 32-560 mg L- of N P K Ca Mg S and vitamin B1 (thiamine) respectively. Proper utilization of WRW could reduce chemical fertilizer use and prevent both surface and groundwater contamination and environmental pollution. However only a few of the studies have compared the use of WRW with the use of conventional NPK fertilizer. The major drawback of WRW studies is that they lack depth and scope such as determining the initial and (or) final soil physico-chemical properties or plant nutrient contents. Considering the rich nutrient content in WRW it will impact plant growth and soil fertility when used as both irrigation water and plant nutrient source. Therefore it is recommended that studies on WRW effect on soil microbial population plant and soil nutrient contents to be carried out to ascertain the sustainability of WRW use as a plant nutrient source.

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Abstract

A significant wastewater source in every household is washed rice water (WRW) because it contains leached nutrients (from washing the rice prior to cooking) that could be used as fertilizer. The paper reviewed the current understanding of the potential use of WRW as a plant nutrient source. WRW was shown to increase vegetables growth such as water spinach pak choy lettuce mustard tomato and eggplant. Different researchers have used various amounts of WRW and their results followed a similar trend: the higher the amount of WRW the higher the plant growth. WRW has also been used for other purposes such as a source of carbon for microbial growth. WRW from brown rice and white rice had nutrients ranging from 40-150 43-16306 51-200 8-3574 36-1425 27-212 and 32-560 mg L- of N P K Ca Mg S and vitamin B1 (thiamine) respectively. Proper utilization of WRW could reduce chemical fertilizer use and prevent both surface and groundwater contamination and environmental pollution. However only a few of the studies have compared the use of WRW with the use of conventional NPK fertilizer. The major drawback of WRW studies is that they lack depth and scope such as determining the initial and (or) final soil physico-chemical properties or plant nutrient contents. Considering the rich nutrient content in WRW it will impact plant growth and soil fertility when used as both irrigation water and plant nutrient source. Therefore it is recommended that studies on WRW effect on soil microbial population plant and soil nutrient contents to be carried out to ascertain the sustainability of WRW use as a plant nutrient source.

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Item Type:	Article
AGROVOC Term:	Wastewater
AGROVOC Term:	Nutrients
AGROVOC Term:	Nutrient availability
AGROVOC Term:	Fertilizers
AGROVOC Term:	Wastewater irrigation
AGROVOC Term:	Soil nutrient content
AGROVOC Term:	Soil fertility
AGROVOC Term:	Plant growth substances
AGROVOC Term:	Soil microorganisms
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10125

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