Liming and coper application on rice yield in peat soils and factor affecting organic matter decomposition
1994
Benjaporn Chakranon
The sample of a peat soil (Narathiwat series) from Narathiwat province was used to study the effect of liming, trace element (Cu, Zn, B) application and mineral soil dressing on growth and yield of rice. The decomposition of organic matter in this soil was also investigated. The studies comprise of 3 experiments. Experiment I. The pot experiment was conducted to study the effect of liming, trace element (Cu, Zn, B) application and mineral soil dressing on the growth and yield of rice on Narathiwat soil. The results showed that the mineral soil dressing gave the highest grain yield. Liming and trace element application ranked the second highest grain yield. The sterility was lowered due to trace element application. There was no yield obtained in the controlled plot. Copper application had relatively beneficial effect as compared to Cu, Zn and B addition. Experiment II. The pot experiment was further investigated on the level of water, liming and copper application which would be suitable for rice production on a peat soil. The chemical kinetics of soil solution was also studied. The result showed that liming increased pH and decrease in Fe, Mn, Cu, Zn and Al was obtained. Liming also increased the organic carbon and phenolic compound in the soil solution. The highest grain yield was obtained with higher rate of liming and low level of copper addition. The sterility decreased appreciably, though not significantly when high level of copper was applied. In the case of low rate of liming, addition of copper resulted in higher unfilled grain. Flooded condition resulted in higher grain yield compared to keeping 10 cm water level below soil surface. Experiment III. The effect of moisture, pH and temperature on organic matter decomposition in a peat soil investigated in the laboratory. The soil was incubated for 4 months with 3 levels of moisture, 2 levels of temperature, with and without liming. Carbon dioxide was determined every 10 day interval using KOSAKA's method. The results showed that organic matter decomposition was highest in soil with low moisture content at 40 deg C in a limed soil.
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