MA&UME& 263 



greater after-effect. The phosphoric acid and potash are 

 not present in a readily available form. 



To find sufficient quantities of farm-yard manure for 

 the maize crop is quite out of the question and under 

 actual conditions it is considered preferable to use coufri 

 for maize, and to reserve the whole of the cattle manure 

 for cotton. As far as the maize and cereal crops are 

 concerned coufri exercises' a more marked effect, and it is 

 becoming more fully recognised that farm-yard manure 

 is employed to greater advantage on the cotton crop and 

 there is an increasing tendency to apply less of it to maize 

 and other crops. 



The question arises as to the relative values of coufri 

 employed as such, and nitrate of soda and sulphate of 

 ammonia employed in quantities containing an equal 

 amount of nitrogen. It is impossible to decide except by 

 direct experiment what percentage of the total nitrogen 

 in the coufri is recovered as increased crop, compared 

 with nitrate of soda or sulphate of ammonia, and which 

 manure may therefore be employed with the greatest 

 advantage. In making a comparison with coufri and 

 soluble nitrogenous manures no value has been attached 

 to the phosphoric acid and potash which coufri contains, 

 but on the other hand, the salt content of the latter must 

 not be lost sight of, for even in the case of those mounds 

 which are not absolutely injurious it is advisable to restrict 

 the amount applied, for cultivators are fully aware of the 

 fact that to continually apply coufri often results in 

 deterioration of the land. 



The considerable accumulation of phosphoric acid and 



