142 



The incr«i«e attril)iiUi])le to 100 pounds of acid pbos- 

 l>liato was 4.42 bnshols, wliicli mado the use of this 

 iiiiiicral fertilizer <l(M'i(le(lly jtiofitable for corn on very 

 poor wliite sandy s'ti^l, when used in connection with a 

 lar<;e mass vi' licli vc«;ctal)le matter. On the other 

 hand, on a spot about 100 j^ards distant, where the 

 soil was le.ss sandy and in better condition, phosphate 

 did not increase the yield of corn when added to pea 

 vines plowed under. (See page 140.) 



Immediate Fertilizing Effect on Sorghum of Cowpea 



AND Velvet Bean Vines and of Cowpea and 



Velvet Bean Stubble. 



The soil on which the following experiment was made 

 is a sandy loam, containing many small flint stones, and 

 underlaid bv a stififer subsoil. 



In 1898 eight uniform plots were planted, 2 plots 

 with velvet beans, 5 with Wonderful cowpeas (most 

 plots broadcast), and 1 with drilled Orange sorghum. 

 The growth of the several plots was either cured for hay 

 or used as a fertilizer, as indicated in the next table. 



March 9, 1899, all plots were plowed and in due time 

 sorghum was planted in drills on all plots, and the two 

 cuttings of this crop at the proper season were cured 

 for hay. 



The yields per acre of sorghum hay at two cuttings, 

 the first growth having become too coarse, but the sec- 

 ond being of good quality, averaged as follows : 



First year effects on sorghum of stnhhle or vines of coiv- 



peas or velvet beans. 



