162 



TILTH AND TILLAGE 



sections conservation of moisture and aeration are sometimes 

 questioned, because different results have been attained under 

 different conditions. A few of these results are of interest. 



In Illinois. On the common corn-belt soil of Illinois (brown 

 silt loam) the following nine-year averages in corn were obtained : 



Method of cultivation 



Yield per acre 



(a) Land plowed, seed bed prepared, weeds allowed to grow 

 (6) Land plowed, seed bed prepared, no cultivation, weeds 



kept down by scraping with hoe 

 (c) Land plowed, seed bed prepared, cultivated 3 times 



7.4 bushels 

 48.9 bushels 



H 

 43..S bushels 



In Minnesota, during a dry year, the following corn yields 

 were secured on a " black loam soil containing considerable sand": 



Method of cultivation 



Yield per acre 



(a) When all weeds were allowed to grow 



(6) When weeds were cut with hoe without stirring soil 



(c) When cultivated 6 tunes (3 times each way) 



0.4 bushels 

 45.8 bushels 

 50.6 bushels 



In Wisconsin. On a heavy silt loam (Miami) the following 

 results were secured during a year in which no beneficial rain fell 

 during the period between July 3 and August 12: 



During a dry summer following a wet spring (1916), the follow- 

 ing results were obtained in growing soybean hay in rows on sand 

 at Hancock, Wisconsin. Very little rain fell between June 30 

 and August 15. 



