Abstract
This experiment was conducted at the Department of Agriculture, Ceylon in 1962 to 1963 during the author's stay there, to investgate the growth and yield of indica rice. The results obtained are summarized as follows:
1. Application of urea as compared with ammonium sulphate in acid lateritic paddy field significantry out yielded.
2. In general effect of nitrogen application to the acid lateritic soil in low cation exchange capacity on the yield of rice have a little response, particularly acid nitrogenous fertilizers have a very little response due to the root rot by the presence of sulfides in the soil. While the acid lateritic soil in high cation exchange capacity have a good response.
3. By application of ammonium sulphate in strong acid lateritic soil and ground water podzolic rice soil, physiological activity of roots considerably decreased in the presence of sulfides. Moreover, absorption of nitrogen was retarded and metabolism of carbohydrate became abnormal.
