New YorK AGRICULTURAL EXPERIMENT STATION, 325 
In the following year, where a combination of phosphate of 
ammonia and sulphate of potash was used, supplying the soil 
.0004 per ct. of potash and .0001 per ct. each of phosphoric acid 
and nitrogen, the seed did not germinate well nor the plants 
grow vigorously. 
Sulphate of ammonia in combination gave poorer results in 
every case than the other forms of nitrogen. Ag in previous 
tests, the results with muriate of potash were less favorable 
than those with the sulphate. Carbonate of potash-magnesia with 
dissolved bone biack and dried blood or with double superphos- 
_ phate and nitrate of soda gave very satisfactory growth. Goess- 
mann concludes that soluble saline compounds should not be 
used in excess in lettuce fertilizers, especially not under glass. 
Jenkins and Britton® report interesting data on the amount of 
nitrogen taken from the soil by forced lettuce and the quantity 
necessary to supply in fertilizers to meet this demand. The soil 
used was sifted anthracite coal ashes mixed with 5 per ct. of 
peat moss and fertilized with sufficient quantities of chemicals. 
Simpson White-seeded Tennis Ball lettuce was, after two trans- 
plantings, grown to maturity on this medium. 
The lettuce was of good quality, though not claimed to be 
equal to the best grown in rich natural soil. The time of growth 
is not stated. The draft on the soil by the entire plants of 1000 
heads of lettuce thus grown was 282.6 grams nitrogen, 87.7 
grams phosphoric acid and 621 grams potash. To meet this 
demand would require fertilizers equivalent to 1105 lbs. per 
acre of nitrate of soda, 331 Ibs. dissolved bone black and 394 lbs. 
muriate of potash. 
In 1897 Watts® published a report of some experiments in 
which nitrate of soda gave good results when applied three 
times to loose lettuce in pots. It was applied to each pot at the 
rate of 2 oz. dissolved in one-half pint of water, making the total 
amount for the season 14 ozs. per plant. 

‘Jenkins and Britton. Conn. State Sta. Ann. Rept. 1895:93-95, 
*Watis, R. L. Tenn. Agr. Exp. Sta. Bul., X, 2:27. 
