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Collection of irrigation water samples for analysis.

 Common sampling tools and accessories 
  1. Clean Plastic or glass bottle of 500 ml capacity .
  2. cotton or nylon thread .
  3. water table recorder.
  4. Glass marking pencil .
  5. labels and tags


Sample collection procedure.
  1. The container must be thoroughly clean before the use.
  2. Bottle  should be rinsed 3 to 4 time with water from which the sample is drawn .
  3. care should be taken to collect sample only after continuous discharge of the source for 10 to 20 minute .
  4. if the source of irrigation water is tank channel or river  the sample should be drawn either away from the sides or from the mid stream.
  5.  the tubewell and hand pump are to be Run for about 10 to 20 minut prior to the sampling and for open well several buckets of water have to be thrown out first .
  6. About half litre of the sample is quite sufficient.
  7.  the water sample after labelling must be send laboratory immediately for testing in order to avoid any change or deterioration in its quality due to the chemical microbial activity .
  8. if delay is inevitable then 2 to 3 drops of pure toluene  may be added to prevent bacterial activity .
  9. filter the water sample To whatman filter paper If sediments are present.
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