การใช้ปุ๋ยเคมีตามค่าวิเคราะห์ดินเพื่อลดต้นทุนการผลิตข้าว

Abstract

Objective of chemical fertilizer application based on soil analysis is to focus on the comparison of many chemical fertilizer recommendations for effective nutrient management for crop growth and yield in order to reduce rice production cost. The three methods of chemical fertilizer recommendations are general recommendation based on soil texture, based on soil laboratory analysis, and soil & fertilizer management program (LDD-P2). The experiments were conducted with 2 activities of normal paddy soil, and problem soils (saline soil and acid sulfate soil) during October 2008 to September 2009. The results showed that there were not statistic different in all methods of nutrient management recommendations in normal paddy fields at Phitsanulok, Phatthalung, and Ratchaburi except at the site of Suphanburi which LDD-P2 gave significantly lower in yield than the other two methods. As the salinity paddy soil at Nakhon Ratchasima, yield which managed by using chemical fertilizer including with Sesbania rostrata and rice husk were higher in yield and lower production cost by which it showed slightly response at Ratchaburi. In conclusion, the suitable methods for farmers we need to consider the rice production cost and net benefit gained of each method. However, the results were fluctuated in acid sulfate soil due to the short period of soil preparation with lime that soil pH need longer time to increased to the appropriate level. Then chemical fertilizer application will be more effective increasing in yield.