Food for no t a dd to, b u t rather diminish the quantity of alkali 

 ans in the soil, for the associated gypsum and acid phos- 

 f 74 phate loosen heavy clay soils which need improvement 

 in texture. 



In this connection, it is important to observe that 

 care must be exercised, in soils containing black alkali, 

 to avoid materially increasing the content of carbonate 

 or bi-carbonate of lime, since this would help promote 

 the destruction of humus. It is, therefore, suggested 

 for these particular soils, that the large and constant 

 use of lime be avoided. When lime is needed, have 

 your soil examined by an expert, and do not put on any 

 more lime in any form than advised for your particular 

 case. In other words, take good care to preserve your 

 humus. Do not destroy it by excessive liming on any 

 account. Neither wetness nor stickiness will result 

 from the rational use of Chilean Nitrate. The pro- 

 ductivity of all soils may be increased by the right use 

 of it. 



All arid soils lack nitrogen on account of having 

 but little natural humus in them, so the application 

 of Chilean Nitrate gives good crop increases. 



What Burbank Says: 



"After testing a great variety of fertilizers on my 

 orchard and experimental grounds, I find that the 

 Nitrate of Soda and Thomas slag phosphate have 

 given the best results at the least expense, and I shall 

 not look further at present, as my trees, bulbs, plants, 

 flowers and fruits have been, by the use of about 150 

 pounds each per acre, nearly doubled in size and beauty 

 in almost every instance. The above-named fertilizers 

 have more than doubled the product of my soil at a very 

 small outlay per acre. 



Where the Nitrate of Soda is used, I find a greatly 

 increased ability in trees to resist drought, and lack of 

 cultivation." 



" Luther Burbank is the greatest originator of new 

 and valuable forms of plant life of this or any other 

 age," says David Starr Jordan, President of Leland 

 Stanford Junior University, California. 



