53 



The percentages of potash in the straw from each plat have 

 greater differences than those of the other ingredients, as remarked 

 before. The plants which produce a greater amount of straw and 

 grain contain a lower percentage of potash, and the actual amount 

 of potash is also found to be smaller in the rice crop that gives a 

 better yield. Thus the ratios of these ingredients shows the greatest 

 differences in the " Potash " column of Table 46. 



A somewhat similar fact can be seen by examining the results 

 of the manure experiments by W. P. Kelley and Alice R. Thompson, 

 (Hawaii Agr. Expt. Stat. Bull. No. 24). The complete fertilizer 

 plat was treated with 60 Ibs. of nitrogen, 45 Ibs. of phosphoric acid 

 and 60 Ibs. of potash, per acre, derived respectively from Ammonium 

 sulphate, superphosphate and potassium carbonate. The nitrogen 

 plat was treated with 60 Ibs. of nitrogen from ammonium sulphate. 

 The following tables are prepared and elaborated from Kelley and 

 Thompson's figures. 



Table 47, Nitrogen, Phosphoric Acid, Potash 

 and Dry Matter. 



