home; mixed fertilizers. 



137 



fruit, seeds, tubers, etc., are taken into account in the figures in 

 the table, but the plant food removed in the tops, straw, etc., is 

 considered as well. 



THE APPROXIMATE AMOUNT OE NITROGEN, PHOSPHORIC ACID AND 

 POTASH CONTAINED IN THE TOTAL YIELD OE DIFFERENT CROPS, 

 INCLUDING STRAW, VINES, ETC., FROM ONE ACRE IN ONE YEAR. 



Kind of Crop. 



Yield per 

 Acre.f 



rt =0 



p B 



if 



p 



2 -o 

 ■2 a 



m B 



c-c O 



. £§ 1 



03 



~2 

 0- 1 





40 bush. 



30 bush. 



60 bush. 



30 bush. 



60 bush. 1 



12 tons. ) 



300 bush. 



700 bush. 



600 bush. 



3 tons. 



3 tons. 



3 tons. 



40 bush. 



74 

 53 



60 

 62 



84 



55 

 80 

 110 

 123 

 69 

 84 

 100 



23 

 21 

 22 

 20 



32 



25 

 52 

 40 

 27 

 27 

 21 

 40 



68 





60 





50 



Wheat 



26 







Corn f odd er, green 



34 





85 





180 





190 



Clover hay* 



132 



Timothy and red top 



58 



Mixed hay (some clover] 



93 





70 







* Legumes that under favorable conditions derive a large part of their nitrogen 

 from the air. 



t Larger yields than the average are purposely given, but no larger than should 

 be striven for as an average. 



PLANT FOOD IN THE SOIL AND SOD. 



The amount of available plant food in the soil has a very- 

 important bearing upon what should be applied. There is a 

 wide spread belief that a chemical analysis of a soil will serve 

 as a guide to the selection and use of fertilizers. While in a 

 rare and occasional instance a chemical analysis will throw light 

 upon the question of soil fertility, such an analysis is, unfortu- 

 nately, of very little help in determining the needs of the soil 

 for crop growing. The chemist can tell how much of each 

 ingredient the soil contains, but cannot tell whether it is in avail- 



