AGRICULTURE AND DENDROLOGY. 
11 
CONCLUSIONS. 
The foregoing may be condensed into the following 
points:— 
1st A complete fertilizer, the elements of which are properly 
proportioned to the needs of the plants, or to complement 
the defects of the soil, gives the best result. 
2nd Of partial manures nitrogen, in the form of ammonia, 
appears to be most effective on irrigated rice. 
3rd Nitrogen increases the yield by stimulating the plants 
to throw up shoots from the roots, thus increasing the 
number of seed bearing culms, and not by increasing the 
size of the panicle or the weight of the grain. 
4th If nitrogen is applied in excess of the wants, individual 
grains do not attain normal size and weight. 
5th Nitrogen increases the percentage of straw to that of grain 
more than other manures. 
6th Phosphoric acid does not largely affect the yield, but it 
increases the size and weight of individual grains, and it 
increases the percentage of grain to that of straw. 
7th Potash is intermediate in its effect between nitrogen and 
phosphoric acid: that is, it affects the yield more than 
phosphoric acid, but less than nitrogen ; and it increases 
the percentage of grain to that of straw less than phos¬ 
phoric acid, but more than nitrogen. 
