34 
to know whether they tend to become more available on remaining 
in the soil. Tests were accordingly conducted, using acid phosphate, 
bone meal, floats, and 10 guanos. The effects of these materials 
added to the soil six weeks before planting were compared with those 
of the same materials added to the soil immediately before planting. 
Both red clay soil and river sand were used. Detailed results are 
given in Tables XII and XIII, and a summary in Table XIY. 
For the test described in Table XII, millet was grown in river sand 
No. 213 (45 pounds dry soil per pot with a water content of 18 per 
cent), 30 plants per pot being grown from October 12 to November 
23, 1915, with a basic fertilizer consisting of 8.4 grams sodium nitrate, 
6 grams ammonium sulphate, and 8 grams potassium sulphate per 
pot given in two applications. 
For the test in Table XIII, millet was grown in red clay, 38 pounds 
dry soil per pot with a moisture content of 33 per cent. The plants, 
28 to the pot, were grown from May 10 to June 26, 1916, with an 
application immediately before planting of a basic fertilizer con- 
sisting of 6.3 grams sodium nitrate, 4.5 grams ammonium sulphate, 
and 6 grams potassium sulphate per pot. 
