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Technique for Bulk Production and Application of Quick Effective Straw Decomposing Bacteria for Liquid State Fermentation

Sheng-Chi Chu

Miaoli District Agricultural Research and Extension Station,

Council of Agriculture, Executive Yuan, R.O.C.(Taiwan)

Tel:886- 37-991025 ext.30

      The paddy rice is the most important cereal crop in Taiwan region, with a total planting area of 260,000 ha., and output of 1.41 million MT straw. The rice farmers used to burn the straw in the open air, resulting in severe air pollution. The dense smoke harms human health and severely disturbs the driving safety in nearby areas. Later on, a fine between NT$ 5000 and NT$ 100,000 is imposed on those burning straws in open areas, in accordance to Article 31 and Article 30 of the Air Pollution Control Act. The straw decomposing bacteria is a solution to the above problem for farmers.

      Miaoli District Agricultural Research and Extension Station identified the most effective straw decomposing bacteria (MLBv19-3) from more than 200 strains of bacteria over a research period of five years. The bacteria can produce fiber decomposing enzyme, which decomposes the thick haulms completely within 7 days. The decomposition time is shortened by 50% in comparison to traditional solid state decomposing fertilizer, rendering the use of bacteria labor saving and convenient. The MLBv19-3 decomposing bacteria are developed into liquid digest, which is dripped at the water inlet of paddy field to diffuse the decomposing bacteria uniformly, at a rate of 5-10 min per 66.67㎡. The solid state decomposing fertilizer requires 30-40 min for manual spreading, the time is shortened 3-4 times. The straw is decomposed in situ, while saving manpower and expenses. The organic content in soil can be increased by 0.5-0.8%, and the basal fertilizer and labor cost for next soil preparation are reduced by NT$3,000-4,000. In addition, the test proves the output of paddy rice is increased by 3-5%. Decomposing the straws in the field provides 5-10 kg of total nitrogen, 3-6 kg of phosphoric anhydride, 8-11 kg of potassium oxide, and mains the pH at 5.8-6.3.


     The decomposing bacteria (MLBv19-3) can accelerate the decomposition of straw, while saving manpower and cost for soil preparation. The usage is very convenient, thus increasing farmers' willingness to decompose and bury the straw in situ, and reducing the air pollution and environmental burden.



一、Treatment procedure of liquid decomposing bacteria

Step 1: the straw is cut into 5-7 cm by harvester during the harvest of paddy.

Step 2: The chopped straw is evenly laid on the field.

Step 3: The field is watered immediately, the straw absorbs water thoroughly, the water level in the field is kept at 3-5 cm.

Step 4: The liquid decomposing bacteria are dripped into the field through the water inlet as per 200 L per hectare.

Step 5: The water is supplied continuously, the water level in the field is kept at 5-10 cm within 7 days, the field end shall be supplied with sufficient water.

Step 6: After 7 days of treatment, the straw is softened, browned and rotten.

二、Highly active decomposing liquid VS solid state decomposing fertilizer

  • Liquid digest, dripped at the water inlet of paddy field to diffuse the decomposing bacteria uniformly, at a rate of 5-10 min per 66.67㎡.

  • The liquid digest decomposes rice straw within 7 days.

  • The solid state decomposing fertilizer is spread manually, which is time and labor consuming, at a rate of 30-40 min per 66.67㎡. Using the decomposing bacteria can shorten the time 3-4 times.

  • Solid state decomposing fertilizer needs 14 days.

三、Advantages of applying probiotic decomposing liquid

1. No straw burning, no fine for air pollution, the in-situ straw decomposition can save manpower and expenses effectively.

2. The coarse fiber of straw in the upper soil layer is reduced by 8% after treatment, the haulm hardness is reduced by 80-100 g.

3. The organic content in the soil per hectare is increased by 0.5-0.8%, and includes 5-10 kg of total nitrogen content, 3-6 kg of phosphoric anhydride, 8-11 kg of potassium oxide, while keeping the pH at 5.8-6.3.

4. The production is increased by 3-5% in the first year after treatment.

5. The basal fertilizer is not required for next soil preparation. The basal fertilizer cost and labor cost per hectare can be reduced by NT$3000-4,000.