598 



EEPORT OF THE COMMISSIONEE OF AGRICULTURE. 



pea is a most valuable substitute. In one respect, tliat of flourishing 

 in soil too ]>oor to produce a crop of clover, it has tlie advantage of the 

 latter. It is not only through the growth above ground that a green 

 crop improves and enriches the soil, but also through the roots. It has 

 been estimated that after the removal of a crop of clover and other 

 plants, there remained in the soil the amount of roots shown below : 



Table sliowhitj the qit an tit i; of roots left in the ground after harvesting the crojjs . 



amount of nitrogen and ash. 



«/so the 



Roots of— 



Stubl.lo 

 and roots 

 (dry), per 

 acre, to a 

 depth of 

 lOi iiicliGS. 



■Nitrocen, 

 per aero 



Asli IVno 



from cur- 



boiiic acid, 



per acre. 



Liieerne 



Itf d clover 



Kv" 



Swedish clover 



();U.s 



Lupine 



Wheat 



Eiigli.sh peaa .. 

 B;uley 



Pounds 

 9, C7»^. 1 

 f<,92l.6 

 b,2Vyi G 

 5, 01'4, H 

 3,331.9 

 3, 5l!0. 9 

 3,470.0 

 3, 222. 5 

 1,901.4 



Poumls. 

 130. < 

 191. ( 



Co.: 

 102. ! 



20. 1 



ti'2. ; 



2."). I 



Po 



iindn. 

 1, 201. C 

 1, 9i9. 9 

 1, 747. 8 

 974.6 

 1,444.7 



u:^o. 



1,089.8 

 070,7 

 3U1.1 



A crop of cow-peas would probably have a similar amount of roots 

 and 24 tons of tops in the green state. 



The following analyses were made by Prof. A. B-. Le Doux, as chemist 

 of the State board of agriculture of North Carolina : 



Analysis of the ash of cow-pea vines. 



Constituents. 



Ash 



Potash 



Soda 



Magnesia 



Lime 



Phosphoric acid 



Constituents. 



Sulphuric acid 



Silica 



Chlorine 



Oxide of iron . 

 Carbonic acid. 



Percent. 



