Republic of the Philippines CAMIGUIN POLYTECHNIC STATE COLLEGE Institute of Agriculture Tangaro, Catarman, Camiguin Name: _______________________________Date Performed: __________________ Course and Year: ______________________Date Submitted: __________________ SOIL SAMPLING Laboratory Exercise No. 1 I. Introduction II. Objectives: 1.Identify the sampling unit based on the crop grown 2.Demonstrate how to collect soil samples accurately, and explain the importance of proper sampling III. Materials Needed Hand shovel/ hoe/ soil auger Cellophane Ruler Soil siever IV. Methods Soil Sampling Procedure: 1.In sampling a large tract of land, divide the entire field into sampling areas to include soil appearance, topography, drainage, past treatment and crop cultivated. 2.Choose 15 to 20 sites in a given area, and scape away the surface litter preparatory to taking soil samples. 3.With the use of spade or soil auger, take representative samples from chosen site in each sampling area, 6 inches deep. Hence you will have 15 to 20 sub- samples from chosen sites in each sampling area. Hence you will have 15 to 20 sub-samples for each area. Mix these sub-samples thoroughly to make a composite sample for the area. 4.Air dry the collected samples in a well-ventilated room that is free from obnoxious gases. Spread the collected samples evenly on a piece of paper. Break clods. 5.Pass the samples through a 2 mm sieve and keep them in mason jar or in polyethylene bags which are properly labeled. 6.Get from 1 to 2 kg of a well-mixed composite soil sample for the various soil analyses.
Preparing the Soil Sample for Analysis: Place the soil samples on s large piece of paper and quarter it. Cone the soil sample at the corner of the paper, flatten the cone and divide it into quarter. Remove the two diagonal opposite quarter and return them to the sample container. Again mix the soil materials in the two remaining quarter and continue the process of quartering and rejection of two diagonally opposite quarters until the same sample is reduced to the desired amount (approximately 2.5 g). Soil Sample Entry Form a. Place where sample was collected b. Date of Sampling c. Previous crops grown d. Crop or crops to be grown e. when the field was limed and the rate of application f. whether the field will be manured for the crop being grown g. depth of plowing h. soil type, series, or management group i. whether drainage is good, poor or intermediate j. whether irrigation is to be used k. special problems and conditions V. Guide Questions: 1. What are the areas/ spots that should be avoided in collecting soil samples? Why? 2. Why are the soil samples collected at random? 3. Is it advisable to sun-dry soil samples? Explain 4. Why is it important to take a good soil sample? 5. What are the factors to be considered to have a good soil sample? Results Discussion
Conclusion and recommendations References
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