ASHTER

Salinity in the soil vary both spatial and vertical. Therefore, the measurement of adequate land must be made in both directions to obtain the exact results of the salinity in the particular field. Measurements made at high water that remains on the field will not show salinity levels in the soil. Salinity in the soil were measured at most in terms of DHL's solution to the land use DHL gauge, the units per decisiemens meters (ds / m) or millimhos per centimeter (mmhos / cm); both units is the equivalent.

Salinity in the soil can be measured through a variety of ways:

1. Saturated extracts: Use this method when laboratory facilities are available. Technique involves the measurement of DHL's solution is extracted from the pasta water saturated soil. Disuling water that is added to 200-400 g soil dry air - and stirred - until soil is completely saturated. Leave the sample at least 4 hours. Use filter penyedot (pressure plate) or centrifuge to extract water that is enough. Add 1 drops of 0.1% solution (NaPO3) 6 for each 25 mL extract. Measure tesebut extract from DHL. Measurement is abbreviated as DHLe (Electric Power Hantar extracts from). This method gives a more meaningful measure for the salinity in the soil and independent of soil texture, but requires more time.
 
2. Extract ground water: This method also requires laboratory facilities, but the method is easier than saturated extracts. Prepare a mixture of soil: water (1:5 by weight) using air dried soil and water that has been disuling. Shake for 1 hour (or when the shaker is not available, shake hands with the sample for 1 minute at least 4 times in interval of 30 minutes). Let the moment and filter lands larutannya. Add 1 drops of 0.1% solution (NaPO3) 6 for each 25 ml extract. Measure Electric Power Hantar solution of the land. Measurement depends on the texture of the soil. To convert units DHL1: 5 to DHLe; multiply by 23 (for sand, loam and loamy sand soil), with 14 (for sandy loam, light loam loamy sand), with 10 (for clay loamy, clayey silt and clay light sand), with 9 (for the sandy clay, silt, light and medium light), with 8 (for the clay are), and with 6 (for heavy clay).
   
3. Piezometers: This method is fast and can be used directly in rice fields with high water that remains. Metal or plastic pipes perforated or slit bercelah-inserted into the mire with a perforated zone which is adapted to the soil profile in which the salinity will be measured. Pipe must be long enough so that the top remain several centimeters above the high water in the rice field. Holes in the pipe must be sized small enough so that the only solution that can be ground through. When you ignore the land is a problem, pipes can be covered with cotton cloth secarik with the bottom closed. DHL's solution is to gather in the pipe can be measured using a gauge DHL.