Anon Sooksavat และ Panat Suwanathada; Direk Intaprom. (1999) Influence of Phosphorus, Nitrogen and Organic Fertilizers on Rice Yield and Available Soil Phosphorus. <i>Thai Agricultural Research Journal</i>, <i>17</i>(2), 191-204.Anon Sooksavat และ Panat Suwanathada; Direk Intaprom. "Influence of Phosphorus, Nitrogen and Organic Fertilizers on Rice Yield and Available Soil Phosphorus". Thai Agricultural Research Journal 17 (1999):191-204.Anon Sooksavat และ Panat Suwanathada; Direk Intaprom. Influence of Phosphorus, Nitrogen and Organic Fertilizers on Rice Yield and Available Soil Phosphorus. Department of Agriculture:ม.ป.ท. 1999.