FIELD CROPS. 1127 



Tlio cotton industry in I'>arl);ulos is dcscrilx'd and tlio results of fertilizer 

 oxperinients are reported. In deterininiu^ llie (|uanlity of niti'OKCu needed 

 to produce the best results it was found that the most satisfactory yields 

 were secured when nitrogen as sulphate of ammonia was applied at the rate 

 of 30 lbs. per acre, the increa.sed yield amounting to 279 lbs. of seed cotton. 

 In tiie phosphoric acid series 40 lbs. of phosphoric acid as superphosi)hate of 

 lime produced the best effects, the increase in seed cotton being 2S1 lbs. per 

 acre. The most satisfactory returns in the potash series were secured where 

 20 lbs. of potash as sulphate of potash was u.sed. In these tests the increase 

 of seetl cotton i)er acre amounted to 1!)G lbs. 



Nitrogen fertilizer experiments on meadows, BACHSfANN (Latulw. Wchnbl. 

 Sclilcs. llol.st., J.9 {l'.)0!)), Xo. 2, pp. 22-2Jt). — Cooperative tests are reported 

 ill which sulphate of ammonia, nitrate of soda, and nitrogen lime were com- 

 pared. In one experiment the plats were 0.05 hectare (about J acre) in size 

 and each received 25 kg. each of Thomas slag and kainit. The nitrogen 

 was applied in 10 kg. of sulphate of ammonia and 10 kg. of niti-ogen lime, 

 each substance containing 20 per cent of nitrogen. 



In 1!)()7 the average yield of hay from one cutting on the plat receiving no 

 fertilizer whatever was 02.5 kg., and on the plat treated only v»'ith Thomas 

 slag and kainit 80.5 kg. The plat receiving one-fourth of the sulphate of 

 ammonia in the spring and three-fourths in the fall gave 110.5 kg. of hay, the 

 plat receiving the entire application of sulphate in April 133.5 kg., the one 

 receiving the sulphate in two applications in spring ITG kg., and the plat 

 treated with the nitrogen lime in one ai)plication early in April 165 kg. In 

 ]t>OS the yields of hay on these plats without further fertilization were 125.5, 

 IGl, 1S3.5, 18!), 203, and 207.5 kg. respectively. 



The results of a second and a third experiment show that nitrate of soda 

 given in two applications in the spring gave the best yields of hay, being fol- 

 lowed by suli)hate of ammonia and nitrogen lime, each given in a single applica- 

 tion in the spring. 



Manurial experiments on grass land, 1908, J. Percival {Univ. Col. Read- 

 ing, Dcpt. A(jr. and Hort. Bui. .'/, /)/). 27). — The cooperative fertilizer experi- 

 ments on glass land were conducted at 13 centers. Nitrogen, phosphoric 

 acid, and potash were applied in different combinations, the applications con- 

 sisting of 1 cwt. of nitrate of soda, 5 cwt. of basic slag, and 3 cwt. of kainit 

 per acre, with the exception that in the complete applicaticm only 2 cwt. 

 of kainit was used. Barnyard manure was applied at the rate of IG loads 

 per acre. 



The increase in crop as due apparently to the different fertilizer treatments 

 was as follows: Nitrate of soda alone, 5 cwt.; kainit alone, 5 cwt.; slag alone, 

 10 cwt.; the complete fertilizer application, 15.25 cwt.; barnyard manure, 

 13.75 cwt.; slag and kainit together, 10.25 cwt.; slag and nitrate of soda, 

 12.75 cwt.; and nitrate and kainit together, 11.25 cwt. The herbage grown 

 with the commercial fertilizer was of a much better quality than that pro- 

 duced with barnyard manure. 



It was observed that soils containing less than 0.025 to 0.030 per cent of 

 available phosphoric acid generally responded freely to the use of a phosphatic 

 fertilizer such as slag or superphosi)hate. Soils containing less than 0.010 

 per cent of available potash gave increaswl yields and improved quality of 

 grass when kainit or snljihate of potash were used. 



Rotation experiment, K. B. Gkkki {Ahrrdcrn and N<>- of t<('ot. Col. A(jr. Bill. 

 JO, pp. 1 1 -hi). — 'I'he nitati<tn consist«'d of turnips, barley, and hay, and the 

 standard application of fertilizers per acre eomi)rised 20 lbs. of nitrogen, 100 

 lbs. of phosphoric acid, .iiid 40 lbs. of ix>tash. The n'sults showed that super- 



