Friday, March 29, 2024

How to prepare the seedlings for transplanting

When choosing the appropriate nursing system, consider the availability of sunlight, water, labor, land, and agricultural implements.

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[restab title=”Wet-bed” active=”active”]

Use this method in areas with sufficient water supply. Allot 1/10 of the field for the seed bed area, and prepare 40 kg of seed to transplant 1 ha of land.nursery-wetbed

  1. Prepare beds at 1 m wide by convenient length. Raise the soil to 5−10 cm height.
  2. Broadcast pre-germinated seeds in thoroughly puddled and leveled soil.
  3. Construct drainage canals for proper water removal.
  4. Add organic manure (decompose) and a small amount of inorganic fertilizer as basal dressing. This increases seed vigor and allows easier uprooting for transplanting.
  5. Transplant seedlings at 15−21 days old.

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[restab title=”Dry-Bed”]

Prepare the nursery in dry soil conditions. Ensure that the site is free of shade and has access to irrigation facilities. Allot 1/10 of the field for the seed bed area, and prepare 60−80 kg of seed to transplant 1 ha of land.nursery-drybed-with-seedlings

  1. Prepare beds at 1 m wide by convenient length. Raise the soil to 5−10 cm in height.
  2. Distribute a layer of half burned paddy husk on the nursery bed to facilitate uprooting.
  3. Prevent moisture stress by irrigation. Without appropriate moisture, roots may be damaged during pulling.
  4. If nutrient supply is low, apply basal fertilizer mixture and incorporate it between rows.
  5. Transplant seedlings at 15−21 days old. 

Seedlings raised in dry-bed are short, strong, and has a longer root system than those raised in wet-beds.

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[restab title=”Dapog”]

Dapog or mat method is most appropriate for growing short duration varieties, as seedlings experience less transplanting shock. 

Compared to other methods, this requires less labor, and has minimal root damage.

Prepare dapog nurseries where a flat firm surface is available and water supply is very reliable. Allot  100 m2/ha or 1% of the field  for the seedbed, and prepare 40−50 kg of seed per ha.nursery-dapog-method

  1. Mark out 1 m wide and 10−20 m long plots.
  2. Cover the surface with banana leaves, plastic sheets, or any flexible material from penetrating the bottom layer of the soil. Cemented floors may also be used as base. Form the boundary with bamboo splits or banana sheath.
  3. Cover the seedbed with about 1 cm of burned paddy husk or compost.
  4. Sow pre-germinated seeds on the seedbed. Maintain a thickness of 5−6 seeds (1 kg per 1.5 m2).
  5. Sprinkle water to the seeds after sowing, and then press down by hand or with a wooden flat board. 
  6. Prevent water stress by irrigation.
  7. Transplant seedlings at 9−14 days old.

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[restab title=”Modified Mat Nursery”]

The modified mat nursery uses less land and requires fewer seeds and inputs (i.e., fertilizer and water). Allot 100 m2/ha for the seedbed, and prepare 18−25 kg of good quality seeds.nursery-modified-mat

  1. Cover the surface of 4 cm layer soil mix with banana leaves, plastic sheets, or any flexible material from penetrating the bottom layer of the soil. 
  2. Sow pre-germinated seeds on the seedbed, then sprinkle with water. Maintain a thickness of 2−3 seeds.
  3. Water the nursery 2 times a day for 5 days.
  4. Transplant seedlings at 15−21 days old, when seedlings reach the four-leaf stage.

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Source of Article: http://www.knowledgebank.irri.org

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