PLATE XX 



Fig. I. — Clover plants, showing influence of sulphates on growth, i, Check; 2, 

 nitrogen, phosphorus, potassium; 3, nitrogen, phosphorus, potassium, plus sulphur as 

 sodium sulphate; 4, nitrogen, phosphorus, potassium, plus sulphur as calcium sul- 

 phate; 5, sodium sulphate only; 6, calcium sulphate only; 7, elemental sulphur 

 only. 



Fig. 2. — Radish plants, showing influence of sulphates on growth, i, Check; 2, 

 nitrogen, phosphorus, potassium; 3, nitrogen, phosphorus, potassium, plus sulphur 

 as sodium sulphate; 4, nitrogen, phosphorus, potassium, plus sulphur as calcium 

 sulphate; 5, sodium sulphate only; 6, calcium sulphate only; 7, elemental sulphur 

 only. 



Fig. 3. — Radish plants, showing influence of sulphates on growth, i. Check; 2, 

 nitrogen, phosphorus, potassium; 3, nitrogen, phosphorus, potassium, plus sulphur as 

 sodium sulphate; 4, nitrogen, phosphorus, potassium, plus sulphur as calcium sul- 

 phate;' 5, sodium sulphate only; 6, calcium sulphate only; 7, elemental sulphur 

 only. 



(250) 



