EXPERIMENT ON SOIL IMPROVEMENT. 1 53 



GENERAL SUMMARY AND CONCLUSIONS. 



The experiment on soil improvement in igoo was with pota- 

 toes and that of ipoT tvith oat and pea hay. In both years the 

 yield was largest on the plot with the complete fertilizer, hut in 

 proportion to the cost of fertilizing the two plots the yield on the 

 plot with the stable manure was fully as economically produced. 

 hi I goo the yield from the plot with clover for manure was next 

 in size to that from the plot with the complete fe^^tilizer, and the 

 yield from the plot with the minerals and clover for fertilizer was 

 practically the same as that from the stable manure. In igoi the 

 yields of oat and pea hay where a light groivth of vetch was plowed 

 U7ider, either alo7ie or in combijiation with the mineral fertilizers , 

 were much sfnaller than those where stable ma7iure was used. In 

 both years the yield 071 the plot where rye was plowed raider m. 

 addition to the minerals was less tha7i those fro7n the plots on 

 either side where the legumes were used. The results of both 

 years i7idicate a co7isiderable adva7itage i7i the use of legu77ies for 

 green ma7iure. On the zuhole, com7no7i red clover see77is to be the 

 best crop for the piopose of gree7i ma7iuri7ig when it must be 

 grown betwee7i the regular crops of a 7'otatio7i as z'« the expe7'i- 

 77ient here described. The experi77ient would rteed to be C07iti7iued 

 for several yea7's before the i^esults would warra7it a7iy reliable 

 conclusions regardi7ig the I'elative eco7i077iy of the various niethods 

 of fertilizi7ig for i7)ip}^oving the fe7'tility of the soil. 



