16 FERTILISERS AS AN AID TO 



soluble phosphate ; that containing 35 per cent, 

 soluble is about the highest grade generally used 

 in this country. Whilst the higher grades are 

 somewhat more costly to produce proportionate- 

 ly, this is generally more than compensated by the 

 saving in carriage, cartage, and distribution, and 

 the resulting delivered price per unit costs less 

 than in the lower qualities. 



High-Grade Superphosphate is well worth the 

 attention of consumers. British people are 

 generally credited with recognising the fact 

 that it pays to buy the best quality obtainable 

 when purchasing any article, and the same 

 reasoning applies to the selection of fertilisers, 

 whether superphosphate or any other kind. 



It is an established fact that both water-soluble 



phosphates and those which are insoluble in 



water are taken up by plants, though 



Water- the former are assimilated much 

 more rapidly than the insoluble 



areTrefer* forms, which are of little value except 



able. on wet soils deficient in lime or of an 



acid nature. On normal soils, or 



soils containing a fair average amount of lime, 



water-soluble phosphate is alone of practical 



financial value. 



When superphosphate is applied, the first 

 rainfall, even a heavy dew or the natural mois- 

 ture in the soil, dissolves the water-soluble 

 phosphate and causes it to soak into the earth, 

 where it is arrested in a very finely divided 

 condition and thoroughly disseminated through- 

 out the soil. It is in a far finer state of division 



