612 
Philippine Journal of Science 
1920 
DISCUSSION OF RESULTS 
Relative dry yields of tops . — The triangular diagram show- 
ing the relative dry yields of tops (fig. 2) brings out some 
interesting relations between the proportions of the salts 
supplied to the soil and the resulting plant growth as indicated 
by the production of dry tops. In this diagram the area of high 
yields (denoted by small crosses) occupies the right-hand corner 
of the triangle, areas of medium yields occupy the central re- 
Fig. 3. Relative yields of rice grain. Area of low yields indicated by small circles ; area of 
high yields, by small crosses. Highest yield indicated by a large cross ; lowest, by large 
circles. 
gion, and the area of low yields (denoted by circles) embraces 
the whole of the left-hand margin of the triangle. 
The area of high yields includes the cultures characterized 
by the highest proportions of ammonium sulphate, and it will 
be seen that no high yields were obtained when this salt made 
up less than 0.4 of the total osmotic value of the salt mixture. 
Culture R2C7 is apparently exceptional, since it gave only a 
medium yield, although it lies in a region where a high yield 
