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Examples

  • However, the level of 15N-labelled azolla in the internal organs gradually decreased, whereas the level of 15N-labelled azolla in the muscles greatly increased (Table 3).

    Chapter 6

  • There were high levels of 15N-labelled azolla in the internal organs of nile tilapia and low

    Chapter 6

  • After uptake of 15N-labelled azolla for 96 h, 15N recovery in the intestine, stomach, and liver decreased from 10.3% to 1.0%, 1.6% to 0.2%, and 2.4% to 0.7%, respectively.

    Chapter 6

  • The utilization of 15N from azolla in the rice-azolla-fish system is increased to 67.8% (Table 4); whereas, the rice-azolla treatment using 15N-labelled azolla as a top dressing at the maximum tillering stage had a utilization rate of 46.1%.

    Chapter 6

  • 15N-labelled azolla levels in the external organs at the start of the experiments.

    Chapter 6

  • Under these conditions, pure cultures of either species do not use azolla efficiently.

    Chapter 6

  • This reduction was probably due to the dilution of 15N from the azolla by the other nitrogenous matter excreted from the alimentary canal of the fish (which includes digestive juice, sloughed cells from the stomach, and azolla).

    Chapter 6

  • Observations from 1983 to 1986 indicate that the rice-azolla-fish system effectively suppresses weeds and rice pests (Table 7).

    Chapter 6

  • A glass aquarium (95 cm x 68 cm x 45 cm) held the soil (200 kg), rice plants (30 hills), fish (30), and azolla.

    Chapter 6

  • The rice-azolla-fish system provides an excellent growing environment for rice, fish, and azolla.

    Chapter 6

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