Physiological effect of nitrogen application on aromatic rice

Abstract

A comparison experiment with one non-aromatic and three aromatic varieties of rice under no nitrogen and nitrogen application showed that nitrogen application increased photosynthesis and respiration rates and nitrogen content of rice plants. However, the increase in photosynthesis the rate was not very significant. In comparison, the promotion of leaf respiration by nitrogen application of Ratna, non-aromatic rice, was significantly larger than that of HKR228, an aromatic rice variety. The respiration rate and nitrogen content of rice plants dropped remarkably during panicle initiation and heading periods. After heading the nitrogen contents of various parts of rice plants were arranged as follows: blade >panicle >sheath >culm . Basmati 370 had a small culm and a relatively higher plant height. The increase in plant height of this variety by the application of nitrogen was significantly larger than that of the other three varieties. This was one of the major physiological causes of difficulty in a further increase in the yield of scented rice of Basmati type.