STUDY ON AGRICULTURAL GEOECOLOGY OF DONG MO THONG SUB-DISTRICT, BAN MUANG DISTRICT, SAKON NAKHON PROVINCE

Abstract

The objective of this research is to study the agricultural geoecology of water sources and soil fertility in the area of Dong Mo Thong Sub-district Ban Muang District Sakon Nakhon Province to prepare the agricultural development plan. The sample groups were selected specifically from farmers in sharing area of water usages including 4 villages; Ban Khilek, Moo 1 Ban Dong Huai Puea, Moo 5, 7 and 11. The data was collected by community meeting for sharing knowledge of surface water resources, analysis of water quality and soil fertility. The results represented 22 surface water sources, water quality analysis 4 sources and soil fertility analysis 18 sources. Total amount of water storage capacity is 6,092,195 m³ with amount of 2,405,720 m³ for stored water in dry season (March 2019). The demand of water usage for agriculture was approximately 18,884,309 m³/year. Therefore, water demand for 4 villages are higher than the water storage capability. The water quality in dry season was not less than the surface water quality standard. The water can be consumed for both agriculture and household usages. Soil fertility was analyzed between low and medium. Soil has very low to moderate cation exchange capacity (CEC), organic matter (O.M.) and available phosphorus (P) content.Soil salinity was low to moderate level. Soil pH was slightly acidic to strongly alkaline. Useful potassium was low to high level. Meanwhile, nitrogen content was low. Biofertilizer was suggested to supply into soil. Chemical fertilizer should be supply appropriately to promote growth and development and improve yield.