tree and crop and lessen the risk of loss by winter 

 waste waters. 



Acidulated forms should always be applied just 

 before an irrigation or rain, for then the water will 

 carry the soluble portion to the deepest roots, 

 wherever, in fact, water can go. There reversion to 

 insolubility may and probably does occur in a few 

 days, but the phosphoric acid is where the roots can 

 act on it directly. 



Nitrate of soda should not be applied in late fall 

 or winter months while growth is dormant, as it 

 would probably be leached away before the tree could 

 take it up. Organic forms should be applied in 

 January or before. 



AMOUNT TO APPLY. 



As to the quantity to apply, no one can tell this 

 without careful experiment. Much depends upon the 

 character of the soil, the condition and age of trees, 

 and variety of fruit in question. The most vigorous 

 growth requires the most food. Each grower must 

 be his own authority. 



A pound of high grade fertilizer to each year of 

 age of the tree is the amount usually recommended 

 for navel orange trees in full bearing. Orchards other- 

 wise well cared for, supplied with this amount, 

 increase their yield each year. Usually, however, 

 where two pounds per year of age of tree is used, the 



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