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 



Treatment. 



None 



None 



Percentage of magnesium in magne- 

 sium sulphate plus calcium sul- 

 phate : 



Percentage of magnesium in magne- 

 sium chlorid plus calcium chlorid: 



Molecu- 

 lar ratio 

 of cal- 

 cium 

 to 

 magne- 

 sium. 



Wheat, series L. 



Pot No 



Percentage of magnesium in magne- 

 sium carbonate plus calcium car- 

 bonate : 



5:4 

 5 = 4 

 5:4 

 5:4 

 5:4 

 5 : 4 



5:4 

 5 : 4 

 5 : 4 

 5 : 4 

 5:4 

 5 : 4 



5 : 4 

 5 : 4 

 5^4 

 5'-4 



219 

 220 



203 

 204 

 205 

 206 

 207 

 208 



209 

 210 

 211 

 212 



213 

 214 



21S 

 216 



217 



218 



Tops. 



5-8 

 2. 1 



2.4 

 3-3 

 3-8 



4.4 



5-i 

 3-8 



1.6 



i-5 



3- 1 

 3-5 

 5-2 

 8.8 



6.8 



3-3 

 6.8 

 4. 2 



Roots. 



3-0 



1.4 



1. 1 

 1. S 



i-3 

 i-7 

 1.6 



•7 

 .6 



i-3 

 1.6 



2-5 



4-7 



4.0 



i-5 

 7.8 

 2.6 



Soybeans, series M. 



Pot No 



237 

 238 



221 

 222 

 223 

 224 

 225 

 226 



227 

 228 

 229 

 23O 

 23I 



233 

 234 

 235 

 236 



Tops. 



i-3 



2.0 



3-2 

 2.6 



5-5 

 4.9 



3-6 



4. o 



2.9 

 7.8 



6-3 

 7.6 



Roots. 



°-3 



.6 



