ABDEL-TAWWAB, M., ABDEL-GHANY, A., EL-AYOUTY, Y., EL-ESSAWY, A. (2002). EFFECT OF DIFFERENT DOSES OF INORGANIC FERTILIZERS ON WATER QUALITY, PRIMARY PRODUCTIVITY AND PRODUCTION OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) IN EARTHEN PONDS. Egyptian Journal of Agricultural Research, 80(4), 1891-1907. doi: 10.21608/ejar.2002.316881
MOHSEN ABDEL-TAWWAB; ALI E. ABDEL-GHANY; YASSIN M. EL-AYOUTY; ABDEL-FATTAH A. EL-ESSAWY. "EFFECT OF DIFFERENT DOSES OF INORGANIC FERTILIZERS ON WATER QUALITY, PRIMARY PRODUCTIVITY AND PRODUCTION OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) IN EARTHEN PONDS". Egyptian Journal of Agricultural Research, 80, 4, 2002, 1891-1907. doi: 10.21608/ejar.2002.316881
ABDEL-TAWWAB, M., ABDEL-GHANY, A., EL-AYOUTY, Y., EL-ESSAWY, A. (2002). 'EFFECT OF DIFFERENT DOSES OF INORGANIC FERTILIZERS ON WATER QUALITY, PRIMARY PRODUCTIVITY AND PRODUCTION OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) IN EARTHEN PONDS', Egyptian Journal of Agricultural Research, 80(4), pp. 1891-1907. doi: 10.21608/ejar.2002.316881
ABDEL-TAWWAB, M., ABDEL-GHANY, A., EL-AYOUTY, Y., EL-ESSAWY, A. EFFECT OF DIFFERENT DOSES OF INORGANIC FERTILIZERS ON WATER QUALITY, PRIMARY PRODUCTIVITY AND PRODUCTION OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) IN EARTHEN PONDS. Egyptian Journal of Agricultural Research, 2002; 80(4): 1891-1907. doi: 10.21608/ejar.2002.316881
EFFECT OF DIFFERENT DOSES OF INORGANIC FERTILIZERS ON WATER QUALITY, PRIMARY PRODUCTIVITY AND PRODUCTION OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) IN EARTHEN PONDS
1Central Laboratory for Aquaculture Research, Agricultural Research Centre, Ministry of Agricultural, Dokki, Giza, Egypt
2Faculty of Science, Zagazig University, Egypt
Abstract
Earthen ponds (surface area 155 m2 each) were used to study the effect of different doses of inorganic fertilizer on water quality and fish production. Each pond was stocked with 150 fish of Nile tilapia; Oreochromis niloticus (25-30 gifish). The ponds received inorganic fertilizer (20:20:5 N:P:K) with doses of 0, 20, 40, 60 and 100 kg/fed/mth. The obtained results revealed that there were no significant differences in water temperature, dissolved oxygen, pH value, free ammonia water conductivity, nitrate concentration, total hardness, and total alkalinity due to the effect of different doses of inorganic fertilizer. Only Secchi disk reading, orthophosphate concentration and total nitrogen were significantly affected by treatments. Chlorophyll 'a' content over all the rearing period was increased by increasing the applied doses and the highest one was obtained with using 100 kg/fedirnth. The optimum production of Nile tilapia was obtained with the dose of 60 kglfed/mth. Data of carcass proximate analysis showed that there were no significant differences in dry matter, while crude protein total lipids and ash contents differed significantly by different doses.
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