6 BULLETIN 222, U. S. DEPARTMENT OP AGRICULTURE. 



not have been the very best obtainable for that section, but by using 

 the same variety in all of the methods under study uniformity in this 

 factor has been obtained. 



Uniformity in rate, time, and manner of seeding has been observed 

 on all plats at the same station. There is naturally some variation 

 between the different stations. Differences in climatic conditions 

 have been recognized in differences in the rate of seeding, but at the 

 same stations it has been uniform. The usual rate of seeding has 

 been 6 pecks of hulled barley and 3 pecks of hull-less. Both the 6-rowed 

 and the 2-rowed barleys are hulled varieties. 



There is considerable variation in the time of seeding for the differ- 

 ent field stations throughout the area, it being about a month earlier 

 in the southern than in the northern portion. At some of the sta- 

 tions the time of seeding is about the same as that of wheat and 

 oats. At others it is a little later. All seeding has been done with 

 a drill. Some stations, on account of the type of soil, have used the 

 press drill in order to firm the soil around the seed. At other stations 

 a drill without a press attachment has been used. 



For a comparative study of the effect of environment and for 

 securing data on production, certain parts of the work are made 

 uniform at all stations. This results in the attempted growth of bar- 

 ley and other crops in sections to which they are not adapted and in 

 their growth at certain stations by methods not adapted to the con- 

 ditions obtaining there. 



Considering the fact that no two stations can have exactly the 

 same combination of soil and climatic factors and that the combi- 

 nation resulting from any two seasons is not the same, it is evident 

 that the consequent effects of the different tillage methods will not be 

 the same. Therefore, the results obtained from different methods 

 at each station are given separately. 



In this bulletin a table divided into two parts is presented for each 

 station. The first part shows the yields that have been obtained 

 each year by each of the different methods under which barley has 

 been grown, considering only the treatment during the one year imme- 

 mediately preceding the crop. Where more than one plat has been 

 grown under the same treatment for the previous year, only the aver- 

 age yield of the whole number of plats so grown is given. Column 2 

 shows the number of plats so averaged. In the presentation of 

 yields, the column headed " Treatment and previous crop" indicates 

 the method of preparation, whether fall plowed, spring plowed, listed, 

 subsoiled, disked, green manured, or summer tilled. Some of these 

 are again subdivided, to show the previous crop. In the last column, 

 where the average appears under the heading "Average," the calcu- 

 lation is from the left. For a rough comparison of seasons, the bot- 



