Evaluation of a local rock phosphate on a tropical acid soil in Southern Thailand
1996
Chairatna Nilnond | Aitken, L.R. | Wichai Pantanahiran | Charassi Nualsri (Dept. of Earth Science. Prince of Songkla University, Songkhla Thailand)
Glasshouse experiment was conducted to evaluate the effectiveness of local rock phosphate the effectiveness of local rock phosphate as P source for plant growth using acid sandy clay loam soil (Paleustults) from Klong Hoi Khong. A factorial experiment was use with two sources of phosphorus, Ban Pru rock phosphate (RP) and monocalcium phosphate (MCP), applied at a range of rate from 0 to 1600 kg P/ha and 0 to 800 kg P/ha, respectively, factorially combined with five rates of lime (0, 200, 400, 800 and 1200 kg/ha) and three replications. Maize was used as the test species. Results showed that in the absence of lime maximum yields were obtained at rates of 800 kg P/ha as MCP and RP. However, maximum yields obtained in the presence of lime and MCP were significantly higher (P0.01) than those obtained when lime and RP were combined. Soil pH was raised from 4.25 to 7.01 when RP was raised from 4.25 to 7.01 when RP was applied at a rate up to 1600 kg P/ha and up to around 8 when lime and RP were applied in combination. The maximum pH values obtained with lime and MCP were around 6 to 6.5. Applications of suitable rates of this local RP could be expected to ameliorate acid soil and supplied P for plant growth.
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