期刊名称：Walailak Journal of Science and Technology (WJST)
印刷版ISSN：2228-835X
出版年度：2011
卷号：8
期号：1
页码：33-40
DOI：10.2004/wjst.v8i1.9
语种：English
出版社：Institute of Research and Development, Walailak University.
摘要：The experiment was conducted in twelve 400 m 2 earthen ponds at Walailak University, Thailand, to investigate the effects of fertilizer application intervals on production performances of giant gourami and pond water quality. Fertilizer applications at 1, 2, 3 and 4-week intervals were replicated three times in a completely randomized design. Ammonium phosphate and ammonium sulfate were used at application rates of 9 kg N plus 4.5 kg P 2 O 5 ha -1 (N:P 2 O 5 = 2:1) as a source of nitrogen and phosphorus. Fish of an average weight of 2.2 ± 0.1 g were stocked at 1 fish/m 2 . After the 120 day trial was finished, the results showed that the survival rate was not significantly different ( p > 0.05) but final weights, growth rates and net productions were significantly different ( p < 0.05). Fertilizer applications at 4-week intervals showed the highest (average ± SD) final weights, growth rates and net productions which were 37.6 ± 3.4 g, 0.3 ± 0.03 gd -1 and 330 ± 2.5 kg/ha respectively. However, most water quality parameters were not significantly different ( p > 0.05) and were in the range for optimal growth of fish. In addition, the result from regression analysis showed that fertilizer application intervals gave a high positive correlation with fish productions (r = 0.76, p < 0.01). In conclusion, the results suggest that fertilizer applications at 4-week intervals could have practical use in the giant gourami ponds to produce fish ranging from 2.2 ± 0.1 - 37.6 ± 3.4 g size during the 120 day production.
关键词：Phosphorus, fertilizer, freshwater fish ponds, water quality, giant gourami, Osphronemus goramy Lacepede
