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To prevent the occurrence of nematodes, the substrata should be constantly changed-it should never be older than six months to one year. The straw must be carefully selected and should be disinfected thoroughly before use. 100 gms of potassium permanganate, or 20 ml of formalin should be sprayed on the bags if the disease should appear.
We put the soil samples in the tulgren funnel and observed the arthropods that fell into the beaker under a compound microscope. We also observed some preserved specimens of microarthropods. 15th November: Pounded 100 gms of soil sample and then sieved each soil sample through 5 sieves. Then weighed the soil in each sieve and noted this down. 16th November: Did sieving of soil in the morning.
If only one drop of water comes out, then the moisture content is correct. Polythene or polypropylene bags are now required to fill the straw into. The bags should be approximately 35 x 50 cm and should weigh 150 gms each. Before using them, they should be washed with savlon or dettol or formalin. Four strings should be tied together at one end which should be placed at the bottom of the bag.
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