. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. Fig. 209. Tripod magnifier. shown in Fig. 209, costing twenty-five to fifty cents, is satisfactory. By spreading grass or clover seed thinly on a sheet of white paper and looking at it carefully with a lens, it is easy to detect the presence of any considerable amount of weed seeds or chafl[. The seeds used as adulterants are much more difficult to distinguish, and in all cases
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. Fig. 209. Tripod magnifier. shown in Fig. 209, costing twenty-five to fifty cents, is satisfactory. By spreading grass or clover seed thinly on a sheet of white paper and looking at it carefully with a lens, it is easy to detect the presence of any considerable amount of weed seeds or chafl[. The seeds used as adulterants are much more difficult to distinguish, and in all cases of sus- pected adulteration samples of the seed should be sent for examination to the state agricultural ex- periment station or to the Seed Laboratory of the United States Department of Agriculture. All seed should be practically free from weed seeds and chaff, and contain no adulterants. Clover and alfalfa should be bright and contain no brown or dodder Testing for germination. All the quick-germinating seeds, such as clover, timothy and grain, can be easily tested for ger- mination by any one with the simple tester shown in Fig. 210. Mix the seed thor- oughly and count out 100 or 200 seeds just as they come, mak- ing n© selection ex- cept to discard any weed seeds. Put them between a fold of canton flannel or some similar cloth that has been washed in boiling water, tak- ing care not to let the seeds touch one another. Lay the cloth on a plate, moisten it well but do not saturate it, cover with another plate and keep at a temperature of about 70° F. Every day count and take out the sprouted seeds. In four to ten days all of the good seeds will have sprouted, and the percentage of seed that will grow is known. Some of the grass seeds are more difficult to test, requiring more exact conditions and an alter- nating temperature. In all cases where seeds do not germinate well in the simple tester shown, it is best to send them away to be tested before dis- carding them.
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