612 



IOWA DEPARTMENT OF AGRICULTURE. 



table world in order to exist, and in existing uses such products to produce 

 heat and to increase the body growth. In using these substances carbon 

 dioxide is given off from the lungs of the animal and becomes a part of the 

 atmosphere. When wood or coal is burned the same product is produced. 

 Everywhere where vegetable matter is being used for food, fuel or similar 

 purposes There is being added constantly large quantities of carbon 

 dioxide to that already present in the air. The trees and plants make use 

 of this product to produce material of value to man. When wood is used 

 for fuel an ash remains consisting largely of the plant food that the 

 roots have brought for the use of the tree. The chemical composition of 

 some of the different woods and their ashes may be shown by the fol- 

 lowing results: 



ASH CONSTITUENTS OP DIFFERENT WOODS. 



AIR-DRY WOOD CONTAINS 



$K 



THE ASH CONTAINS 



Ash, wood 



Chestnut, bark 



Chestnut, wood 



Dogwood, bark 



Dogwood, wood 



Hickory, bark 



Hickory, wood 



Magnolia, bark 



Magnolia, wood 



Maple, bark 



Oak leaves, mixed". . . 



Oak post, bark 



Oak post, wood 



Oak, red, bark 



Oak, red, wood 



Oak, white, bark — 

 Oak white, wood ... 



Pine burr 



Pine, Georgia, bark . 

 Pine, Georgia, wood 

 Pine, old field, bark 

 Pine, old field, wood 

 Pine, straw, mixed . . 

 Pine, ypllow, wood . . 

 Pine, black, wood ... 

 Sycamore, wood? 



10.00 

 10.00 

 10.00 

 10.00 

 10.00 

 10.00 

 10.00 

 10.00 



10. oo 



10.00 



10.00 

 10.00 

 10.00 

 10.00 

 10.00 

 10.00 



10.00 

 J 0.00 

 10.00 

 10 00 



io'oo 



10.00 

 10.00 



0.32 

 3.51 

 0.16 

 ,9.87 

 0.68 

 3.97 

 0.48 

 2.98 

 0.36 

 9.49 

 4.70 

 12.10 

 0.77 

 8.29 

 0.57 

 5.95 

 0.26 

 1.09 

 0.37 

 0.33 

 1.94 

 0.18 

 1.65 

 0.23 

 0.21 

 0.99 



0.012 

 0.114 

 0.911 

 0.140 

 0. 0.=)7 

 0.0(51 

 0.058 

 0. 095 

 0.032 

 0.421 



0.149 

 0.278 

 0. 029 

 0.341 

 0.190 

 0.141 

 0.138 

 ii. 192 

 0.071 

 1.197 



0.116 

 0.070 

 0.103 



aofio 



0.074 

 0.025 



0013 

 0.012 

 0.095 

 0.007 



o.'oio' 



0.009 

 0. 121 



0.249 

 0.169 

 0.179 

 0.140 

 0.125 

 106 



0.024 

 050 

 0.077 

 0.008 



'6'045 

 0. 030 

 0.230 



0.60 

 0.01 

 2.11 

 1.40 

 6.80 

 2 59 

 10.04 

 4.89 

 8.05 

 3.25 



0.65 

 6.88 

 1.81 

 5.38 

 1.62 

 3.43 



'2.45 

 6.25 

 3.10 

 6.54 



"3." 20 

 0.50 

 0.62 



In addition to the above results the analysis of ashes from other sources 

 may be useful. 



COMPOSITION OF COMMERCIAL FERTILIZING MATERIAL. 



2 



Ashes (anthracite coal). .. 

 Ashes (bituminous coal) .. 



Ashes (lime-kiln) 



Ashes (wood, leachedV 

 Ashes ( wood, unleached ) . 



Cotton-hull ashes 



Seaweed ashes 



15.45 



30. 22 



12.50 



7.80 



1.47 



48.50 



28. 08 



34.00 



9.60 



6.06 



2 60 

 2.66 

 3.40 

 10.75 

 4.37 



0.14 

 '2.' 98 



6.60 



