368 
The Philippine Journal of Science 
1915 
Basing our opinion on our experience we would say that too scanty 
spacing induces more weed growth which in turn becomes an item of 
expense in its control, therefore, with most varieties, spacing the hills 
not closer than 15 x 15 cm. nor more widely than 20 x 20 cm. will insure 
good results. 
As to the optimum number of plants to a hill, we have arrived 
at certain conclusions which a study of the following tables will 
make self-evident: 
Table IV. — Showing the area required for transplanting the seedlings pro- 
duced from 1 cavan of seed. 
Planting 
distance. 
Plants 
per 
place. 
Seedlings 
per hectare. 
Area required to plant— 
1,200,000 
seedlings. 
1.680,000 
seedlings. 
2,160,000 
seedlings. 
cm. 
sq. m. 
sq. m. 
sq. m. 
10 by 10 
i 
1. 000, 000 
12, 000 
16, 800 
21, 600 
12. 5 by 12. 5 
i 
640, 000 
18, 750 
26, 250 
33, 750 
12. 5 by 12. 5 
2 
1, 280, 000 
9, 375 
13, 125 
17, 885 
15 by 15 
1 
444, 444 
27, 000 
3,780 
48, 600 
15 by 15 
2 
888, 888 
13, 500 
1, 890 
24, 300 
20 by 20 
1 
250,000 
48, 000 
6,720 
86, 400 
20 by 20 
2 
500, 000 
24, 000 
3,360 
43, 200 
20 by 20 
4 
1, 000, 000 
12, 000 
16, 800 
21,600 
20 by 20 
8 
2, 000, 000 
6, 000 
8,400 
10, 800 
22. 5 by 22. 5 
4 
790, 120 
15, 186 
21, 260 
27, 337 
22. 5 by 22. 5 
8 
1, 580, 240 
7, 593 
10, 630 
13, 668 
22. 5 by 22. 5 
16 
3, 160, 480 
3, 796 
5,314 
6, 834 
22. 5 by 22. 5 
22 
4, 345, 660 
2, 761 
3,865 
4, 970 
25 by 25 
4 
640, 000 
18, 750 
26, 250 
33, 750 
25 by 25 
8 
1, 280, 000 
9, 375 
13, 125 
16, 875 
25 by 25 
16 
2, 560, 000 
4, 687 
6, 561 
8,437 
25 by 25 
20 
3, 200, 000 
3, 750 
5,250 
6, 750 
30 by 30 
6 
666, 666 
18, 166 
25, 432 
32, 400 
30 by 30 
12 
1,333, 333 
9,000 
12, 600 
16, 200 
30 by 30 
18 
1, 999, 998 
6, 000 
8, 600 
10, 800 
The three numbers of seedlings given in the column headings 
represent the quantities which may be produced from the three 
groups of seeds established in Table III. 
From Table IV it is very evident that the area possible to 
transplant with the seedlings produced from 1 cavan of palay 
depends upon the transplanting distance, the number of plants 
per place, and the number of seedlings produced from a cavan. 
The transplanting distances given represent nearly all possi- 
ble variations. Given the transplanting distance and the desired 
number of seedlings per hill, then it is very easy with the aid 
of this table to calculate the approximate area required for any 
given number of seedlings. In actual practice the number of 
