home: mixed fertilizers. 



143 



If the potatoes are to be grown on sod land and a good stub- 

 tie of clover or mixed grasses with the aftermath has been 

 plowed under, or if stable manure is used, much of the organic 

 nitrogen needed for the crop will, as shown in the table on page 

 138 be supplied by either of these materials. Under such con- 

 ditions a formula containing nitrate and only a small amount of 

 other nitrogen would doubtless give good results. Some such a 

 formula as the following could be used : 



FORMULA (NO. 3) EOR 300 BUSHELS POTATOES, TO BE USED ON SOD 

 LAND WHERE A GOOD STUBBLE AND AETERMATH HAS BEEN 

 PLOWED UNDER, OR IN CONNECTION WITH EARM MANURES. 

 EOR ONE ACRE. 



1 



Phosphoric acid. 



1 



® 





CI . 



■8" 





M^ 



»-* ^ 



X'O 



P a 



•3 a 



cS s- 



+3 3 



5 s 



.3 3 





> a 



O O 



Zft 



<p. 



Eh P. 



00 



a- a 



Nitrate of soda 



Screened tankage 



Acid phosphate 



Sulphate of potash 



Total 



Percentage composition 



16 







11 



15 



32 





39 



42 



27 



54 



74 



3.4 



6.8 



9.2 



100 



100 

 12.5 



The tankage in the above will be sufficient to keep the fertili- 

 zer in good mechanical condition without the use of a filler. 



CORN. 



Corn is a crop that uses a large amount of nitrogen. It is 

 usually grown upon sod land, or with farm manure, or both. 

 Indeed, it is doubtful if under ordinary conditions it would prove 

 a profitable crop to be grown on somewhat exhausted soil with 

 commercial fertilizers alone. Experiments at the Massachusetts 

 Station indicate that it does best with an excess of potash. 

 Three formulas are suggested for use on sod land and in con- 

 junction with farm manure. In the first of the following 

 formulas the materials will not of themselves make a good dry 



