1 Noy., 1899.] QUEENSLAND AGRICULTURAL JOURNAL. 493: 
The results of the manuring experiments carried owt om 12 stools of 
Louzier, at the station, seem somewhat in confliction, but the best results seem 
to have been obtained from those manured with a mixture of organic nitrogen, 
from dried blood (ammonieal nitrogen), from ammonium sulphate and nitric 
nitrogen, from sodium nitrate. 
Soluble phosphate acid has given better results than insoluble phosphoric 
acid. 
————————— 
Vorestry. 
FOREST CONSERVANCY, No. 5. 
' By A. J. BOYD. 
I wave in previous papers on the subject of the conservation of the forests of 
this colony indicated the reasons which render it imperative that the present 
system, or rather want of system, of dealing with one of our most valuable 
assets and heirlooms of posterity—the timber trees—should be placed upon an 
entirely different basis. In those articles I have shown the value of forests, not 
only as the source of our eyer-increasing requirements for various industries. 
and for public and private works but also in their indirect utility, as they affect 
climate, rainfall, preservation of the integrity of the land during heavy rains: 
and floods, and their powerful agency in preserving and increasing the nutritive 
power of the soil. 
Experts in forestry have shown that evaporation in a forest is only about 
two-fifths of that in the open country. For instance, from eareful observations 
made in Germany (Bavaria and Prussia) by Dr. Ebenmayer, the following con- 
clusive results were obtained :— 
| Quantity of Water Evaporated from a Free Surface | Less in Forest, 
of Water. Height in Inches. Ste in per’ 
" | cent, of the 
Stations, ——— tes 3 ——_— “ Total Rossi 
- : ted in the 
| In the Open. | In Forest. Less in: Vorest. eu San OGert 
Tas Tange es Os eee aoa ees a 
Bavaria 23°53 | 8°61 = 14:92 el a 
Prussia | 13°16 5:98 ee a7 ek8, — 55 
Mean * ae 18°34 | 7:29 | — 11°05 = fds) 
| | 
* Dr. W. Schlich, Manual of Forestry. 
Another very important point was elucidated by Dr. Weber, and that is the 
balance of rainfall over evaporation according to elevation. The following 
table shows clearly that the balance of water retained by the soil increases 
rapidly with altitude, and that the evaporation in mountain forests may be 
reduced to about 10 per cent. of the rainfall :— 
} Excess of Rainfall over Evaporation Percentage of Rainfall which 
| in Inches. .vaporated. 
Altitude of Stations in 
Feet. = es: oF ae 
In the Open. In Forest. Ta the Open. | In Forest. 
: | / | 
0—328 | 12°02 12°32 | 37 
828—G56 | 12°69 13°84 | 80 
984—1,312 12°2 17°65 25 
1,969—2,297 | 36°96 80°79 13 
2,540 | 47°10 43°08 9 
3,050 56°77 : 46°34 11 
