20 expp:riment station record. 



How to determine the fertilizer requirements of Ohio soils, ('. E. Thorne 

 (Ohio Sid. Circ. 7!). /i/i. ,i.i, iiiai) I). — This circular explains tlw laboratory, pot 

 culture, and Held experiment methods of studying the fertilizer requiremeuts 

 of soils, the conclusion being that field exi)eriments furnish the only safe guide 

 for this purpose. Tlie methods of conducting such experiments and of drawing 

 conclusions from the results obtained are explained in detail. 



Report on cooperative field experiments in Jutland, 1906 {Bcretning om 

 LokaJc Markforsixj oy ForeviNningsmaiker i Landboforeningenie i Jylland 1906. 

 Aarhu.s, 1907, pp. 351, figs. 2'i). — The report covers a large amount of field 

 experimentation conducted by farmers' clubs in different parts of Jutland during 

 loot!. Seven hundred and twenty-four different fertilizer trials with winter 

 and spring grains, roots, and hay crops were made, as well as 344 trials with 

 farm crops, variety tests, methods of planting or culture, green manuring, etc., 

 making a total of 1,068 different trials for the year. Detailed information is 

 given in each case as to cultural conditions, fertilizers applied, and results 

 obtained. Data are also given as to economy of the fertilization in each case. 



Superphosphate and sodium nitrate produced the best results in case of all 

 crops, except the root crops, with which this combination of fertilizers came 

 second, and sodium nitrate alone first ; the complete fertilizer, on the other 

 hand, came third or fourth, potash with one or the other of the ingredients pro- 

 ducing the poorest results, and in the case of all the crops, except the mangels, 

 generally at an actual loss. It is suggested that the poor showing of the potash 

 fertilizers may have been partly due to their rather late spring application. 



As a general rule, the best and most certain results from the applications of 

 the various fertilizers were obtained with the winter grains and the least certain 

 returns w'ith the spring grains. Owing to the dry September the root crops did 

 not respond to the fertilizers applied in as marked manner as usual. There was 

 considerable uncertainty in the after-effects of the fertilizers on the first-year 

 clover and grass meadow, but many striking examples were obtained showing 

 that it pays to apply potash and phosphates, even if only the total increase in 

 the hay crop is taken into consideration. There was, however, a marked im- 

 provement in most cases in the quality of the hay due to an increased growth 

 of leguminous plants and good grasses. 



In 158 other field trials tests were made of the adaptability of different re- 

 gions to a profitable culture of alfalfa ; time and method of application of 

 sodium nitrate; distribution and harrowing in of potash salt and superphos- 

 phates ; different phosphatic fertilizers ; lime niter r. sodium nitrate : " Kul- 

 tui-a " phosphate, marl, and lime; green manuring; barnyard manure and liquid 

 manure; time of sowing spring grains; time of thinning mangels; gray and 

 yellow oats; variety tests of oats, barley, rye, potatoes, and turnips; alfalfa 

 experiments ; culture of peas, grown alone and in mixtures ; maize for green 

 feeding ; crop rotations on sandy soils ; picking of mangel leaves ; grading of 

 seed oats ; cultivation tests ; grass-seed mixtui'es ; and prevention of club-root 

 disease. 



Cooperative fertilizer trials in Malmohus County, 1906, M. Weibull, G. 

 NoRDiN, and G. Thome (Malmo. Lans K. HusMll. SdJlsk. Kvrtlsskr., 1907. No. 

 1, pp. 197-265). — The trials were conducted in the same manner and along 

 similar lines as during the preceding year. The following special investigations 

 were conducted. and are reported in this publication; The best potash fertiliza- 

 tion for fodder beets, ruta-bagas, and barley, being comparisons between 37 

 per cent potash salt and kainit, in which Wagner's results (E. S. R., 16, p. 

 861) were, in general, corroborated; trials with calcium cyanamid v. lime niter 

 for potatoes and sugar beets, showing that the nitrogen in these fertilizers is 

 of equal value; ammonium sulphate v, sodium nitrate for potatoes on sandy 



