132 



('(»\vim:a \'i\i:s, Effixt ox Following Cotton Tuop 



OF 18Di). 



Oil ii reddish loam ui)laiid soil of I'air quality drilled 

 Wond(M*fiil cowpisis an<l cotton, similarly fertilized were 

 «^i<>\Mi ill 1S<)S. Tli(^ i)eas were picked, yielding- 11.8 

 Imsliels ]>er acre, and the vines were i)1o\v(h1 under the 

 next sprin*;, when hotli areas were planted with cot- 

 ton. The corrects 31 eld of cotton in 18D9 was 367 

 pounds, or 32 ])er cent, greater on the area where the 

 jieavines had Ix^^n plowed in than on the plots where the 

 [UiMcding crop had been cotton. 



Coicpea vines, residual fertiJiziny effect on second 

 crop, i:iz., oats grown in 1900. — Burt oats were sown in 

 February', 1900, on the same plots as above to test the 

 residual or second-year effects of cowpea vines. On 

 some plots the oats received no nitrogenous fertilizer, 

 on others TG ix)unds of nitrate of soda was used per 

 acre. 



The yields of oats, in bushels per acre, were as fol- 

 lows : 



FeriiliziiKj effects on oats of coicpeas grown two years 



before. 



In this case we have an increase of 9.7 bushels, or 79 

 per cent., as the effect of cow"pea vines on oats grown 

 as the second crop after cowpeas. So strong was this 



