FERTILIZERS. 235 



The yields of wheat straw on the different plats varied from 2,807. f> 

 to 3,774.74 lbs. and the graiu from 1,530.20 to 2,230.28 lbs. per acre. 

 The average weight of a bushel of grain was .52 lbs. of 100 grains 

 3.8 gin. 



The data reported show that the greatest yield of grain as well as 

 straw was obtained where the wheat was sowed on the fallow ground 

 manured with kainit, superphosphate, and nitrate of soda. The next 

 highest yield was obtained on the plat receiving green manure in addi- 

 tion to superphosphate. Then follow in order the plats receiving (1) 

 green manure and bone meal; (2) green manure, kainit, and Thomas 

 slag; and (3) green manure with barnyard manure. The best grain 

 was obtained from the plats without green manure, but with kainit, 

 superphosphate, and nitrate of soda, and from the plats with green 

 manure and barnyard manure. 



Prom an economic standpoint the use of lupines as a green manure 

 was profitable only in conjunction with superphospate and bone meal. 



The experiment was repeated in 1804 with the result that the largest 

 yield was again obtained from the fallow plat without green manure, 

 but the second highest yield was obtained from the plat receiving green 

 manure and barnyard manure, the plats with green manure and super- 

 phosphate and green manure and bone meal following in order. As in 

 the previous year, only superphosphate and bone meal were profitable 

 in connection with the green manure. — P. fireman. 



Experiments -with mineral fertilizers, M. Podobyed (Selsle. Khoz. 

 Lyesov., 182 (1890), pp. 899-910). — The experiments were carried out on 

 the fields and meadows of the Goretski Experimental Farm in the 

 years 1893, 1804, and 1895. 



Gypsum, phospho-gypsum, and kainit were applied to clover and 

 timothy in the early stages of growth. The experiment occupied four 

 2.7-acre plats, one of which received 135 lbs. gypsum per acre, one 135 

 lbs. phospho-gypsum per acre, and the other 160 lbs. kainit per acre, 

 while the fourth plat was left unfertilized. These fertilizers produced 

 a marked effect on the clover during the first and second seasons, but 

 the effect during the second season was less marked than during the first. 

 Kainit was most effective during the first year, followed by phospho- 

 gypsum and gypsum in the order named; but during the second season 

 phospho-gypsnm was more effective than kaiuit and much more so than 

 gypsum. There was little difference between the results of kaiuit and 

 phospho-gypsum in the first year, but on the whole phospho-gypsuin 

 was the most profitable application. 



In 1893, 1894, and 1895 one 1.35-acre plat of spring wheat, grown 

 after clover, was fertilized with 535 lbs. per acre of phosphorite and 

 another with 26G lbs. per acre of superphosphate. A check plat was 

 left unmanured. The phosphorite improved only the quality of the 

 grain, but when barley was grown on the plat the next year the quality 

 was improved and the yield increased. The superphosphate pro- 

 duced a marked effect on the spring wheat, but its influence on the 

 barley crop the next year was slight. Both applications proved 

 unprofitable. 



