47 



Lbs. 



Average yield of seed cotton per acre, tmferti ized 620 



Increase of seed cotton when catton seed meal was added: 



To unfertilized plot 144 



To acid phosphate plot — 62 



To kainit plot 19 



To acid phosp'^ate and kainit plot 50 



Average increase tvith cotton seed meal '. 38 



Increase of seed cotton per acre when acid phosphate was added: 



To unfertilized plot 136 



To cotton seed meal plot — 70 



To kainit plot — 35 



To cotton seed meal and kainit plot — 4 



Average increase ivith acid 'phosphate 7 



Increase of seed cotton per acre when kainit was added: 



To unfertilized plot 49 



To cotton seed meal p'ot — 76 



To acid phosphate plot — 122 



To cotton seed meal and acid phosphate plot — 10 



Average increase with kainit — 40 



(?HiLTON County^ 2 Miles West of Verbena. 



J. H. WiLi.ouGHBY, 1905-G-7-8. .(See Table, p. 49.) 



Gray mndy soil irith a red suJjsoil. 



Every year this test was made on soil that had been long 

 in cnltivation. In each of the fonr years the complete ferti- 

 lizer (plot 9) afforded a larger yield than the mixture of any 

 two fertilizers. In every test the complete fertilizer afford- 

 ed the largest net profit. AVhen the chemicals were used 

 separatelv or by twos their effect was variable, but when all 

 3 were combined each chemical in this mixture increased 

 the yield more than enough to pay its cost. 



