CONSERVATION PRACTICES FOR TOBACCO LANDS 23 



In the string method all rows located in intervals or sections that nar- 

 row toward the outlet are laid out parallel with the upper terrace; 

 those rows in sections which widen toward the outlet are laid out 

 parallel with the lower terrace (fig. 14) . 



The String Method 



In the string method a guide row is first laid out for each interval 

 between terraces, and all other rows parallel this guide row. The 

 method of laying out the guide row is described in the following 

 paragraphs. 



The diagram in figure 14 shows a terrace interval which requires 

 a single guide row. This covers the normal changes in terrace widths ; 

 namely the narrowing and widening sections between terraces which 

 drain in the same direction. 



1. Starting point : The guide row is started directly below the highest 

 point in the upper terrace. It should be the first row below the terrace 

 at this point. 



2. Guide row crew : The guide row is laid out by a crew of three men, 

 using a ball of twine and stakes. One man follows the channel of the 

 upper terrace and holds the ball of twine. Another man takes the 

 end of the string and moves along the channel of the lower terrace. 

 The middle man holds the string at the point where the guide row is to 

 begin and holds this point on the string throughout the entire opera- 

 tion (fig. 15). The string line should always be kept perpendicular 



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Figure 15. — Establishing the guide row between two terraces, 



method." 



