30 EXPEKIMENT STATION KECOKD. 



FERTILIZERS. 



Fertilizer trials on Swedish moor soils, 1900-1902, II. von Feilitzen (Sven- 

 ska Mosskulturfor. Tidslr., 17 (1903), No. 6, pp. 896-420, figs. 10; 18 (1904), No. 2, pp. 

 73-95, figs. 14). — Method of applying artificial fertilizers. — Experiments were conducted 

 during the season of 1902 with Peluschke peas for the purpose of ascertaining the 

 best method of applying artificial fertilizers as to depth of distribution in the ground. 

 The results showed that the phosphoric acid in Thomas phosphate gave a 42 per cent 

 higher yield of green substance when carefully mixed with the soil to a depth of 15 

 cm. than when the phosphate was" simply harrowed in to a depth of 5 cm., which 

 gave the lowest yield. No appreciable difference in yield was obtained with potash 

 salts whether the fertilizers were mixed with a considerable depth of soil or only 

 harrowed in. The artificial fertilizers were in all cases applied in the spring of the 

 experimental season. 



On the effect of different nitrogenous fertilizers on moor soils. — The following summary 

 statement shows the average relative effect of different nitrogenous fertilizers on moor 

 soils obtained in experiments which were conducted by the author during the period 

 given. Seven trials were made with oats, 1 with barley, and 2 with spring rye. 

 The amount of nitrogen applied was generally 45 kg. per hectare (40 lbs. per acre), 

 and in some cases 30 kg. (27 lbs. per acre). 



Relative effect of nitrogenous fertilizers on moor, sandy, and clayey soils. 



Fertilizer. 



Nitrate of soda 



Sulphate of ammonia 



Fish guano 



Peat-litter poudrette . 

 Barnyard manure 



Moor soil Sandy soil Clayey soil 



(7 trials i. 



100 

 93 

 71 

 59 

 37 



(2 trials). 



100 

 79 

 79 

 50 



(1 trial). 



100 

 75 



The nitrate produced the highest yields in 8 out of 11 trials, the sulphate produced 

 the highest yields in 3 cases, the poudrette produced least in 1 trial, and the barn- 

 yard manure least in 10 trials. 



Experiments of the same character with oats and potatoes at Flahult experiment 

 station, 1900-1902, in which the effects of nitrate, sulphate, and fish guano were 

 compared, gave the following average comparative results: Nitrate, 100; sulphate, 

 with oats, 91, with potatoes, 86; fish guano, with oats, 85, with potatoes, 47. 



Barnyard manure v. artificial fertilizers. — Experiments conducted during 1901-1903 

 with barnyard manure v. artificial fertilizers for oats or pastures on moor soils gave 

 results showing that barnyard manure can not be applied to advantage under these 

 conditions, but should be accompanied with an application of phosphate and potash. 

 On nitrogenous moor soils of the better class the most profitable fertilization was 

 obtained on the plats receiving only phosphate and potash. 



On the fertilizer value of ground gabbro and feldspar on moor soils. — The experiments 

 with these materials which are found on the market and sold under the name of 

 "mineral fertilizers " showed that at least for the crops under trial, alsike clover and 

 Peluschke peas, the effect of their application was practically zero. 



On the use of different phosphatic fertilizers on moor sods. — Comparisons of superphos- 

 phate, Wiborgh phosphate, and Thomas phosphate have been made in experiments 

 conducted under a great variety of conditions and with different crops since 1898. The 

 conclusion was drawn from the results of the earlier series of trials that the citrate- 

 soluble phosphoric acid in Wiborgh and Thomas phosphates has the same fertilizer 

 value when applied on moor soils as the water-soluble and the citrate-soluble acid in 

 superphosphate for the crops on which the fertilizer is applied. The latter experi- 

 ments gave decided evidence that the action of the soluble phosphoric acid in the 3 



