Effect of P, Cu and Zn Application on the Availability of Zn, Cu, Fe, Mn and P and Their Uptake by Rice in Waterlogged Soil I-Availability in Soil

A laboratory incubation experiment was conducted to study the effect of application of varying levels of P (0, 100 ppm), Cu (0, 5 ppm) and Zn (0, 10 ppm) in a waterlogged rice soil on the changes in the availability of the above elements as well as of Fe and Mn in soil. The results showed that application of P decreased the content of DTP A-extractable Cu, Zn and Fe but increased that of Mn. Application of Zn increased the content of all the elements studied, whereas that of Cu reduced the content of extractable Zn and available P, but increased that of extractable Fe and Mn in soil. Application of P, Cu and Zn, obviously increased the extractable content of these elements. The interactions of Zn×P, Zn×Cu, Cu×P and Zn×Cu×P showed varying effects on the availability of Zn, Cu, Fe, Mn and P in soil.