EXPERIMENT ON SOIL IMPROVEMENT. 149 



fodder, and soy beans. The arrangement of the plots and the 

 method of fertilizing each plot are shown in the diagram be- 

 low. 



Arrangement of plots and method of fertilizing in experiment 

 071 soil improvement, igoi . 



Plot K. "Complete" fertilizer, 800 lbs. per acre. 



Plot P. Stable manure, 8 tons (3.4 cords) per acre. 



Plot AL Clover or other letrume for irreen nianurinc 



PI t- N i Mineral fertilizers, 700 lbs. per acre, and rye for green 

 \ manuring:. 



,,, Ti \ Mineral fertilizers, 700 lbs. per acre, and clover or other 

 1 lot P. -^ , r • 



( legume for green manuring. 



The plots contain one-eighth acre each, and are separated by 

 .strips 3.3 feet wide. These strips between the plots and similar 

 strips at the ends and sides of the field are planted the same as 

 the plots, but no fertilizer is applied on them and the growth 

 on the strips is harvested before that on the plots and not in- 

 cluded in the experiment. 



The piece of land on which these plots are laid out is contig- 

 uous to that used for the special nitrogen and soil test experi- 

 ments. The slope on this field is even greater than that on 

 the others, and the inaccuracies due to washing of the soil by 

 rains may be greater. It is believed, however, that they have 

 not interfered very seriously with the results of this experi- 

 ment. 



Plot K is supplied with a liberal amount of complete chem- 

 ical fertilizer, and plot L, with a liberal amount of mixed stable 

 manure. It is intended that the pecuniary value of the fer- 

 tilizer used on plot K shall be approximately the same as that 

 of the stable manure on plot L, estimating the fertilizer ac- 

 cording to the system of valuation followed by the New Eng- 

 land Experiment Stations, and valuing the manure at $3 per 



11 



