Studies on the Effect of Low Acidified Phosphates on the Growth and Yield of Rice and Corn
Shih, T. L.
This study was attempted to explore the possibility of using low acidified phosphorus (LAP) to replace calcium superphosphate (CSP) in upland and paddy field. Fertilizer experiments were conducted in July 1983 to June 1985 at Ho-pi and Kuei-zen of Tainan Prefecture to valuate the effect of LAP on the growth and yield of rice and corn crops. Four treatments, i.e. no phosphate fertilizer (NPF); calcium (CSP); 75% LAP and 50% LAP, were used in a latin square plots with four replication. In rice, phosphate fertilizers increased 1.4~3.5% of yield in the spring crop and 1.3~2.1% in the fall crop and no difference in yield was observed among the three phosphate fertilizer treated. Results of the yield, phosphate content, absorption of P2O5, and available phosphate indicated that 75% and 50% LAP can be used to replace CSP in rice cultivation. In the fall crop of 1983, the three phosphate fertilizer also increased 5.0~6.6% of corn grain yield, and the best yield was observed in the plots with 50% LAP. In the fall crop of 1984, phosphate fertilizers also increased 4.5~5.3% of corn grain yield, and no difference was observed as yields between phosphate fertilizers and non-treated control. In general, 50% LAP can be used to replace CSP as phosphate source in rice and corn production.
Accepted for publication: April 20, 1991.