The response of rice varieties to applied nitrogen under swamp cultivation in Sierra Leon
1973
Das Gupta, Njala University College, University of Sierra Leone, P.M.B., Freetown, Sierra Leon
A field experiment was carried out at Rokupr in Sierra Leone during the dry season of 1967 to study the effect of N application on the growth and yield of an upland rice variety Anethoda, and two swamp rice varieties Taichung Native 1 and Taichung 65. In all the three varieties, N application caused a significant increase in grain yield and its components. The response to N application was more pronounced in the two Taichung varieties than in Anethoda. Percentage increase in grain yield was 92'2, 57_0 and 31_0 in Taichung Native I, Taichung 65 and Anethoda respectively. There was an increase in relative growth rate and N content of the three rice varieties, the increase in N content being higher in the Taichung varieties than in Anethoda. Grain yield was positively related to the number of panicle-bearing tillers, number of filled-grains in 100 grains and N content of panicle. The number of filled grains was positively related to N content of panicle. The time of N application for a higher grain yield in the three varieties has been suggested.
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