6o8 



Journal of Agricultural Research 



Vol. VI, No. 16 



EFFECT OF MAGNESIUM AND CALCIUM IN SULPHATES, CHLORIDS, AND 

 CARBONATES UPON WHEAT AND SOYBEANS IN SAND (SERIES L AND M) 



When calcium and magnesium were applied in sulphates, chlorids, 

 and carbonates the smaller applications gave the highest yields. As 

 recorded in Table XIV, o.i per cent of magnesium in the carbonate 

 inhibited germination and permitted no growth, whereas this quantity 

 in the sulphates and chlorids gave considerable growth; however, the 

 chlorids were more detrimental than the sulphates, while at lower concen- 

 trations, such as o.oi and o.ooi per cent of magnesium, the carbonates 

 gave the best growth, the chlorids being the most detrimental. In the 

 case of soybeans all the chlorid treatments permitted practically no seed 

 formation, while treatment with smaller quantities of carbonates gave 

 considerable seed. The root formation was relatively the same as the 

 top growth, the detrimental effect accompanied short thick roots which 

 appeared brownish or reddish brown. Plate LXXXVII shows this 

 comparative root growth. Plate LXXXVIII, figure i, shows the 

 comparisons of wheat when grown in extracted sand and in dolomite. 

 Figure 2 shows the retarded growth of wheat due to the chlorids of 

 magnesium. 



TABLE XIV. Yields of -wheat and soybeans (in grams per pot on the water-free basis) in 

 the sulphates, chlorids, and carbonates of magnesium and calcium series L and M 



