370 
The Philippine Journal of Science 
1916 
very ordinary, but they show the possibilities of the rice plant. 
The number of plants which produce exceptional yields in any 
variety is small. Supposing it possible to increase the aver- 
age production of the varieties as a result of proper planting 
and selection so as to approach the yields recorded in Table VI, 
the total yields would immediately be doubled or tripled. 
Table VII. — Showing 'potential possibilities of the rice plant? 
[250,000 plants per hectare.] 
Yield. 
Frequency 
of yield. b 
Yield. 
of yield. b 
Per 
plant. c 
Per 
hectare. 
Per 
plant, c 
Per 
hectare. 
9. 
Cavanes. 
9 • 
Cavanes. 
i 
26.5 
154 
61 
10.5 
61 
i 
23.5 
136 
55 
9.5 
55 
2 
20.5 
119 
49 
8.5 
49 
5 
18.5 
107 
43 
7.5 
43 
5 
17.5 
101 
87 
6.5 
37 
7 
16.5 
96 
32 
5.5 
32 
10 
15.5 
90 
9 
4.5 
26 
26 
14.5 
84 
2 
3.5 
20 
36 
13.5 
78 
2 
2.5 
14 
51 
12.5 
72 
1 
1.5 
8 
66 
11.5 
66 
a Jacobson, H. O., Phil. Agr. Rev. 7 (1914) 346 to 351, furnished the data from which 
the above table was formed. 
b Under the column heading “Frequency of yield” the numbers represent cultures of 100 
plants each grown on 4 square meters of ground. 
c Based upon 100 plants grown on 4 square meters. 
In the experiment from which the above results were obtained 
the rice plants were placed 20 by 20 centimeters apart, one 
in a place, ample room being provided for the optimum produc- 
tion of the individual plant. Nine varieties were used in the 
experiment. 
From the point of frequency it will be noticed that 83 per 
cent of the cultures produced a yield which, calculated on the 
hectare basis, exceeded 40 cavanes per hectare and 54 per cent 
exceeded 60 cavanes per hectare. 
A comparison of the average production of the plants recorded 
in Table V with the average production of plants given in 
Table VII warrants the statement that the practical possibilities 
of the rice plants are not obtained by the ordinary Filipino 
methods. 
The exceptional yields obtained in the experimental plots given 
in Table VI when 250,000 plants were grown on a hectare, in 
contrast to from 2,000,000 to 4,000,000 plants, the usual num- 
