ระบบการปลูกข้าวที่เหมาะสมในแหล่งที่มีการระบาดของข้าววัชพืชในจังหวัดอุตรดิตถ์

Abstract

Study on rice crop planting system in an outbreak of weedy rice infested area was conducted in the 2010s in Amphor Pichai, Uttaradit Province, where rice cultivations were done 3 times a year. The research aimed to approach a suitable rice crop planting system that gave productive results in reducing cost of total production, obtaining the total highest profit and the remarkable in controlling weedy rice infestation effectively. Primary data of rice yield and weedy rice population in farmers’ fields representing each type of planting system were collected. The common rice crop planting systems could be classified into 9 patterns; PGSB-PGSB-PGSB, PGSB-PGSB-MT, HT-PGSB-PGSB, MT-HT-PGSB, HT-PGSB-HT, HT-HTPGSB, MT-MT-PGSB, MT-MT-MT and HT-HT-HT. Cost of production of each planting method in the 2010s, total income, total benefit and economic return on the increased investment were used for economic consideration for assessing the suitable planting system in weedy rice infested area by descriptive statistics. The results indicated that HT-HT-PGSB rice crop planting system gave the highest yield (2,438 kg./rai/year), whereas the total cost was minimized (11,053 Baht/rai/year), the highest total benefit obtained (13,717 Baht/rai/year) and the highest economic return (4,466 Baht/rai/year). Apart from that, it could control weedy rice population effectively. Only 19 stems of weedy rice/m2 left in the field for all 3 crops. The PGSB-PGSB-PGSB rice crop planting system not only used the lowest cost (9,111 Baht/rai/year), but it also gave the lowest total yield (1,603 kg./rai/year) and no effective in controlling weedy rice population that showed the 926 stems of weedy rice / m2 left in the field for all 3 crops. MT-MT-PGSB was another planting system that should be considered in case of labor shortage for hand transplanting.