Tillage Experiments with Potatoes. 195 



If crimson clover is o-rown it • will also o-ather iiitroo-en from the 

 atinospliere. (See Bulletin 185, p. 296.) 



As early in the spring as the land will work plow the area, but 

 not quite so deeply as recommended for the antunm plowing. At 

 intervals of eight to fifteen days, from the date of this early plow- 

 ing, till planting time, as the weather will permit, work the ground 

 thoronghly with spring-tooth harrow or cultivator, thus killing 

 several crops of young w^eeds, developing much plant food, and 

 preventing the loss of moisture by evaporation. Sometimes it 

 is an advantage to delay the planting that the land may receive 

 another thorough working before the seed is put in. 



This double working of the land — autunni and spring — coupled 

 with the growing of a catch crop, as circumstances permitted, is 

 believed to have contributed more towards securing such uiiusual 

 average yields on the Station grounds, than any other part of the 

 treatment the land has received. 



Compare this double worked land with an area that has been 

 worked but once, either autumn or spring, as circumstances make 

 convenient. 



No. 3. Early vs. late sjyring jplowing. — 



Plow an area as early in the spring as the land is fit to work and 

 treat it till planting time as in Xo. 2. Compare this Avith another 

 area plowed and fitted just before planting. 



No. Jf. Deep j)lanting and 

 harroioing hefore plants are 

 uj^vs. shalloio planting and 

 without working till plants 

 are well rip. — 



At planting time, whatever 

 the tools or machinerv used 

 in doing the work, endeavor 

 to secure the conditions that 



are obtained by the following plan : Open up with a double mould- 

 board or shovel plow, at appropriate distance (presumably at about 

 36 inches), furrows four or five inches below the general level, 

 throwing the earth up in ridges between the rows. Place the seed 



