— 11 — 



Land flat; surface soil 0.7 m about; sub-soil underneath. 



Surroundings: The plot is open on the south and east. On the 

 west and north, Shirakashi (Quercus myrsinae folia) and Sugi trees 

 grow and make a wood at the distance of some 15 m. The plot is 

 exposed to sunshine all the year round. 



(2) Shady plot. 



Land even with surface soil measuring 0.6 m. 



Surroundings: The plot is open on the east and north. On the 

 south, big Keyaki (Zelkowa acuminata) and Shirakashi, 14 m high, are 

 found at a distance of 7 m; on the west, Shirakashi and norway spruce 

 (Picea excelsa) make a perfect screen so that excepting in summer no 

 direct sunshine falls on the place. 



(3) Wet Plot. 



Land sloping to east; surface soil 0.6 m deep; subterranean water 

 at a depth of 1 m causing dampness throughout the year. 



Surroundings: The place is open in every direction exposed to full 

 sunshine all the day long. 



(4) Dry Plot. 



Land sloping somewhat to the north. Subdivided into three plots : — 

 No. 1. Previous to this trial, the place was used as a field, with 



the soil 0.5 m deep. 

 No. 2. The same as No. 1, except that the soil was enriched with 



humus to a depth of 0.6 m. 

 No. 3. The surface soil was entirely removed leaving only the 



subsoil beneath. 

 Surroundings : Open . in every direction and exposed to sunshine 

 throughout the year and all day long. 



In April, 1905, well grown Sugi seedlings were planted 1.5 m apart 

 on the spots above mentioned. Except weeding the trees were left to 

 grow naturally. The growth was as follows: — 



Those marked manured were given night soil in the spring of 1906 

 and 1907; not manured received no manure. 



