From Maximization to Optimization: A Paradigm Shift in Rice Production in Thailand to Improve Overall Quality of Life of Stakeholders

Table 3

Properties of soils of the Thai paddy fields and the Tochigi fields in Japan.

Site		pH	Water-extractable; N (mg/kg dry soil)		Water soluble phosphorus	Electrical conductivity	Soil organic matter
Country	Province or district		NH4-N	NO3-N	(mg P/Kg dry soil)	Micro- S/cm	(% dry soil-basis)
Thailand	Maesai	5.6	0.672	trace	trace	40	6.9
	Maechai	6.2	5.04	trace	trace	44	5.2
	Pong	6.2	16.5	trace	trace	50	6.0
	Kampang	6.4	1.13	trace	trace	80	5.1
	Sukhothai	6.6	4.77	trace	trace	86	5.0
	Kao Liao	6.5	1.25	trace	trace	108	9.6
	Chumsaeng	7.1	11.1	trace	trace	206	6.8
	Phayuhakiri	6.8	6.79	trace	trace	84	6.1
	Chainat	6.8	8.75	trace	trace	102	4.6
	Ladlumkaew 1	6.3	52.0	6.05	0.398	474	8.3
	Ladlumkaew 2	5.8	40.0	trace	trace	456	11.6
Japan	Tochigi, Japan 1	5.4	29.9	169	0.504	664	21.5
	Tochigi, Japan 2	6.1	9.31	55.0	0.525	750	19.1