Utilization of Community Wastewater in Rice Cultivation, RD 31 (Pathum Thani 80)

Abstract

Utilization of community wastewater in rice cultivation is alternative solution for wastewater
management and water shortage in agriculture. The objective of this study aims to investigate the utilization
of community wastewater in rice variety RD 31 (Pathum Thani 80) cultivation. The wastewater
characteristic of Valaya Alongkorn Rajabhat University has shown slightly alkaline (pH 7.88) and high
organic components (TS, BOD, TN and TP). It was feasible to use the wastewater in 132 days of rice
cultivation and non-toxic. Use of the wastewater with chemical fertilizer 16-20-0 of 35 kg/rai (219 kg/ha)
and 46-0-0 of 15 kg/rai (94 kg/ha) productions cultivated in Ongkharak soil series, that had slightly acid
soil (pH 6.22) and moderate nutrient. This research was an experimental design (CRD) with 5 treatments
and 4 replications. Result of the wastewater use with chemical fertilizers treatment was better height in
growing stages (high, booting, heading and harvesting stages), larger amount of biomass, numbers of
panicles per messy clump and yield than only green manure and only wastewater and tap water treatments,

respectively. Result of the wastewater use with chemical fertilizers treatment showed that grain weight
(27.0 grams/1,000 kernels) was similar to irrigated rice (28.9 grams/1,000 kernels). However, pollutant
residues in plant, yield, and soil ecosystem from wastewater utilization in rice cultivation will be considered
in long-term.