58 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



Similar results have been obtained on the large scale on 

 the Dholi estate in Bihar where in 1918 the best yield of 

 Pusa 12 was given by the plot to which one inch of broken 

 tiles had been added to the soil. At Quetta, the crop 

 experimented on was lucerne. The increase due to the use 

 of the various aerating materials is given in Table IV. 



Table IV. 



The effect of diluting Quetta soil with inert aerating materials. 



That such results are possible can only be explained in one 

 way, namely, that the aeration of both soils is defective. 

 The increased yield is due to the increase in oxidation which 

 follows the improvement in the porosity of the soil. 



The existence of the soil aeration factor furnishes the 

 explanation of the low yields of poor quality which always 

 follow over irrigation on silt-like soils. The texture of 

 these soils deteriorates after being flooded with water. As 



