FIELD CROPS. 



937 



and 147 for the peat-. The weights of the carrots harvested stood as 105.9 for the 

 kaiiiit plats, 121.6 for the kainit superphosphate plats, and 132 for the potassium 

 l»hosphate plats. The excessive quantities of fertilizers applied exerted a very dele- 

 terious influence on the germination and retanled the growth of the plants at the 

 beginning of the vegetative period. The peas did not seem to recover from the effect, 

 l)ut the carrots were able t<j do so. The results obtained on the potassium phosphate 

 plats indicate that the injurious effect observed was not due to the amounts of potash 

 or phosphoric acid applied, but to the inijmrities, such as magnesium salts, chlorids, 

 and gypsum in the kainit and superphosidiate. The potassium phosphate, althougli 

 supplying a still larger quantity of potash and phosphoric acid than the kainit and 

 superphosphate, produced no deleterious effects. The experiments were continued 

 on the same plats during the following year, carrots being grown after peas and peas 

 after carrots. Potash fertilizers again proved injurious to peas but carrots and cab- 

 bage were not injuriously affected. 



In the pot experiments, potash tests with barley on a rather heavy soil showed 

 that the increase in total yield was about the same, whether potassium chlorid or 

 potassium sulphate was applied, but that the chlorid produced the most grain and 

 the sulphate the most straw. In comparative nitrogen fertilizer experiments, the 

 nitrate of soda produced considerably better results than ammonium sulphate. Con- 

 sidering the results from the use of potash and phosphoric acid as 100, the yields 

 were as follows: With nitrate of soda, grain 382, straw 171, and the total yield 222; 

 with ammonium sulphate 115, 162, and 140 for the grain, straw, and total yield, 

 respectively. 



The experiments were repeated the following year on a dark, sandy soil, under 

 otherwise similar conditions as before. The comparative results are given below: 



Relative yields of barley hi pot experiments ivith nitrogen and potash fertilizer n. 



Nitrogen tests. 



Grain. Straw. 



FERTILIZERS APPLIED. 



Phosphatic slag alone 



Phosphatic slag and sul- 

 phate of ammonia 



Phosphatic slag and nitrate 

 of soda 



Phosphatic slag and muri- 

 ate of potash 



Phosphatic slag, muriate of 

 potash, and sulphate of 

 ammonia 



Phosphatic slag, muriate of 

 potash, and nitrate of soda 



I'hosphatic slag and sul- 

 phate of potash 



Phosphatic slag, sulfjhate of 

 potash, and sulphate of 

 ammonia 



Phosphatic slag, sulphate of 

 potash, and nitrate of .soda 



100 



164 

 163 



175 

 168 



Total. 



Potasii tests. 



FERTILIZERS APPLIED. 



Phosphatic slag alone 



Phosphatic slag and muri- 

 ate of potash , 



Phosphatic slag and sul- 

 phate of potash 



Phosphatic slag and sul- 

 phate of ammonia 



Phosphatic slag, sulphate 

 of ammonia, and muriate 

 of potash 



Phosphatic slag, sulphate 

 of ammonia, and suli)hate 

 of potash , 



Phosphatic slag and nitrate 

 of soda , 



Phosphatic slag, nitrate of 

 soda, and muriate of pot- 

 ash , 



Phosphatic slag, nitrate of 

 soda, and sulphateof pot- 

 ash 



Grain, 



111 

 102 



100 



104 



102 



100 



100 



95 



Straw, 



123 

 125 



100 



113 



127 



Total. 



100 



118 

 114 



100 



109 



115 



100 I 100 

 105 I 103 

 105 100 



The soil was in poor fertility, as shown by the fact that the yield of grain and straw 

 with phosphoric acid applied singly stood in the relation to that obtained in the 

 unfertilized pots as 147:100, while with a complete fertilization the total yield was 

 about 260 per cent of the yield in the unfertilized pots. The nitrogen fertilizers in 

 all ca.ses increased the yield of barley, but there was no ai)preciable difference 

 between sulphate of ammonia and nitrate of soda except when ajiplied with phos- 



