Home>Legowo System for Fish-Rice Intercropping

Legowo System for Fish-Rice Intercropping
Cooperating agency for this topic:
Assessment Institute of Agricultural Technology (AIAT), Ungaran, Indonesia, 2001-02-01

Adaptability of Technology

This technology is best suited to small and medium sized farms.

Advantages of the Technology

The advantages of rice-fish inter cropping with the "Legowo System" are as follows:

  • It provides more space for fish, which makes possible a higher population of fish which are larger in size;
  • Weeding, fertilizing, and disease control for the rice can be carried out easily;
  • It saves manpower;
  • It increases soil fertility.

Rice-fish intercropping based on the "Legowo System" can be carried out in 2, 3, or 4 strips or rows ( Fig. 1(968)). Farmers in Indoneisa commonly use a two-row "Legowo System". In this cropping system, two strips are planted in rice, while two strips are left empty. The layout of the Legowo System is shown in the diagram.

The area chosen for the "Legowo System" should:

  • Have enough water all the time, and be free from flooding;
  • Be in a fertile area;
  • Be near to the community.

1. Preparing the Field

  • Prepare the rice field with a bank around the edge. The bank should be 60 cm high, and 60 cm wide at the bottom and 30 cm wide at the top.
  • Dig a ditch (parit) 30-60 cm wide, and 40-50 cm deep. The interval between ditches should be 10-15 cm.
  • Prepare inlet and outlet holes for the water, using a bamboo or PVC tube 5-8 cm in diameter.

2. Planting and Fertilizing the Rice

  • Select a high-yielding variety of rice which is resistant to floods and diseases.
  • Plant rice in the field 25-35 days after germination, at intervals of 25 x 12.5 cm between hills.
  • Use a planting density of 2-3 plants per hill.
  • Adjust the water depth to 10-15 cm.
  • Apply fertilizer three times, i.e., two days after planting with 50 kg urea, 150 TSP and 62.5 kg KCl; 20 days after planting with 50 kg urea and 62.5 kg KCl; and 50 kg urea at 40 days after planting.

3. Introducing the Fish

  • Select carp (Cyprinus carpio), Nile perch (Mosambica nilotica) or gouramy (Oreochromis gouramy) for fish-rice intercropping;
  • Introduce the fish into the rice field 5-7 days after planting for rearing purposes, and 30 days after planting for consumption purposes. The depth of water should be 5 cm if fish are for rearing, and 10-20 cm if the fish are for immediate consumption.
  • Maintain a fish density of 30,000 fish per ha for fish 1-3 cm length, 15,000 fish per ha for those which are 3-5 cm length, and 7,500 fish per ha for those which are 5-8 cm length.

4. Harvesting

  • The fish can be harvested at 40-50 days after introduction, depending on the purpose of the rearing.
  • Rice harvesting can be carried out in the same way as rice planted in a monoculture technique ( Fig. 2(1177)).

Note: Agricultural technologies are highly location specific. For this reason, please try new technology first on a small scale to see if it works well in your own field.

Index of Images

Figure 1 Diagram of &Quot;Legowo&Quot; System<BR>

Figure 1 Diagram of &Quot;Legowo&Quot; System

Figure 2 &Quot;Legowo&Quot; Field with Rice Almost Ready for Harvest

Figure 2 &Quot;Legowo&Quot; Field with Rice Almost Ready for Harvest

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