338 



NATUEE AND PROPERTIES OF SOILS 



Table LXXVIII 



Crop 



Na^SO^ 



Na^COa 



NaOl 



Total 

 Alkali 



Grapes 



Oranges 



Pears 



Apples 



Peaches 



Rye 



Barley 



Sugar Beet . . 



Sorghum 



Alfalfa 



Saltbush 



40,800 



18,600 



17,800 



14,240 



9,600 



9,800 



12,020 



52,640 



61,840 



102,480 



125,640 



7,550 



3,840 



1,760 



640 



680 



960 



12,170 



4,000 



9,840 



2,360 



18,560 



9,640 

 3,360 

 1,360 

 1,240 

 1,000 

 1,720 

 5,100 

 5,440 

 9,680 

 5,760 

 12,520 



45,760 

 21,840 

 20,920 

 16,120 

 11,280 

 12,480 

 25,520 

 59,840 

 81,360 

 110,320 

 156,720 



consequently toxic. High moisfture should, therefore, b)e 

 maintained at least as long as the crop is upon the soil. 



The distribution of the alkali at different depths may have 

 an important bearing as to its effect on plants. Young plants 

 and shallow-rooted crops may be entirely destroyed by the 

 concentration of alkali at the surface, while the same quantity 

 evenly distributed through the soil, or carried by moisture to 

 a lower depth, would have caused no injury. A loam soil, by 



1 ABLE 1j JxJ|3l1Jx. 



Peecentagb of 



Peeoentage of 





Total Salts m 



Black Alkali 



Crops 



Soil 



IN Soil 





.00— .20 , 



,00 .05 



All crops grow 



.20 .40 



.05 .10 



All but most sensitive 



.40 .60 



.10 .20 



Old alfalfa, sugar beet, sorghum, 

 barley 



.60 1.00 



.20— .30 



Only most resistant plants 



1.00 3.00 



above .30 



No plants 



