Materials and methods
This study was carried out in Village number 4, Banpraw Sub-district, Banna District in Na-khon Nayok province. Twenty seven rice-paddy fields owned by 20 farmers, taken from the re-cords of Banna district Agricultural Extension were surveyed and recorded GPS data. Then, the soil, rice, and water samples were collected from each paddy field (Figure 1).
Materials and methodsThis study was carried out in Village number 4, Banpraw Sub-district, Banna District in Na-khon Nayok province. Twenty seven rice-paddy fields owned by 20 farmers, taken from the re-cords of Banna district Agricultural Extension were surveyed and recorded GPS data. Then, the soil, rice, and water samples were collected from each paddy field (Figure 1).
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