868 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 15x15 ecm. nor more widely than 20x20 em. 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. 
| 
| | Area required to plant— 
Planting reais | Seedlings |- —— —— 
distance. | place. | Per hectare. | 1 999.009 | 1,680,000 | 2,160,000 
seedlings, | seedlings. | seedlings. 
cm. sq. Mm. sq. m, sq. m. 
10 by 10 1 1, 000, 000 12, 000 16, 800 21, 600 
12.5 by 12.5 1 640, 000 18, 750 26, 250 83, 750 
12.5 by 12.5 2 1, 280, 000 9, 375 18, 125 17, 885 
15 by 15 5 444, 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 38, 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 18, 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 38, 865 4, 970 
25 by 25 4 640, 000 18, 750 26, 250 33, 750 
25 by 25 8 1, 280, 000 9, 875 13,125 | 16,875 
25 by 25 16 2, 560, 000 4, 687 6, 561 8, 437 
25 by 25 20 38, 200, 000 8, 750 5, 250 6, 750 
30 by 30 6 666, 666 18, 166 25, 432 82, 400 
30 by 30 12 1, 338, 888 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 ITI. 
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 
