Didik Wisnu Widjajanto
The United Graduate School of Agricultural Science, Kagoshima University,
Korimoto 1-21-24, Kagoshima City 890-0065, Japan
Kozo Matsushita
The United Graduate School of Agricultural Science, Kagoshima University,
Korimoto 1-21-24, Kagoshima City 890-0065, Japan
Terumasa Honmura
The United Graduate School of Agricultural Science, Kagoshima University,
Korimoto 1-21-24, Kagoshima City 890-0065, Japan
Nobufumi Miyauchi
The United Graduate School of Agricultural Science, Kagoshima University,
Korimoto 1-21-24, Kagoshima City 890-0065, Japan
ABSTRACT
Nitrogen derived from water hyacinth and recovered in rice crops was measured by employing 15N-labeling techniques. Either 15N-labeled water hyacinth or 15N-ammonium sulphate was incorporated into soil separately. Derived N was significantly detected in shoot of rice at all stages (Tillering Stage, TS; Panicle Initiation Stage, PIS; Heading Stage, HS; and Harvesting Stage, HVS), while there was non-significant difference between treatments in derived N to root throughout the growth season. On the other hand, N was significantly recovered in shoot of rice at TS and PIS only. There were no significant differences between treatments in recovering N at all stages in root of rice crop. About 8.2 - 39.6% and 30.2 - 38.9% of N from water hyacinth and fertilizer, was recovered from the shoot of rice, respectively, whereas, only 1.1 - 5.7% and 2.2 - 5.9% from root of rice crop. It was proved that fertilizer derived more N than that derived by water hyacinth. N recovery of water hyacinth in rice crop in early stage was lower than that of fertilizer, however, in the late stages the figure was similar between the two.
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How to cite this article
Didik Wisnu Widjajanto, Kozo Matsushita, Terumasa Honmura and Nobufumi Miyauchi, 2001. Studies on the Release of N from Water Hyacinth Incorporated into Soil-Crop Systems Using 15N-labeling Techniques. Pakistan Journal of Biological Sciences, 4: 1075-1077.
DOI: 10.3923/pjbs.2001.1075.1077
URL: https://scialert.net/abstract/?doi=pjbs.2001.1075.1077
DOI: 10.3923/pjbs.2001.1075.1077
URL: https://scialert.net/abstract/?doi=pjbs.2001.1075.1077
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