FIELD CROPS. 829 



has been more than twice as great as that of the phosphorus. At Stronprsville 

 the increase clue to tlie jjotassium salt has not hi miy case l)eoii sullich'nt to 

 cover the additional cost of the fertilizer, the avonifxo total ualn for the addi- 

 tion of 2C0 lbs. of muriate of potash in each rotation belnj? but $1.31) over that 

 produced by acid phosphate alone. 



" Where the potassium salt has been added in the smaller quantities used in 

 the other tests, the cost being 50 cts. per acre for each crop at Germantown, 

 Carpenter, and Findlay, and $1.25 per acre for each crop nt the county experi- 

 ment farms, this additional cost has been returned in the increase witli a lib- 

 eral margin in every crop, but the wheat crops have not always been sufii- 

 ciently increased to pay for the potassium without the help of the residual 

 effect on the clover following the wheat. Taking the entire rotation, however, 

 the present indications are that on all these county experiment farms the use 

 of such a combination of phosphorus and potassium as has been employed in 

 these tests will produce a greater net gain per acre than will the phosphorus 

 alone. 



" The addition of nitrogen in nitrate of soda has been justified at 

 Wooster in the total results of the rotation, although the increase of corn has 

 not recovered the additional cost of the fertilizer. The smaller quantity of the 

 nitrate used at the district and county experiment farms has been paid for in 

 the increase at Carpenter only, the apparent increase of wheat in rotation 2 at 

 the Miami county farm being offset by the low yield of corn, indicating that 

 soil variation has as yet had more to do with the effect than nitrogen in the 

 fertilizer. The average results of the two years' work on the Clermont county 

 farm justify the addition of nitrogen to the fertilizer, and it is highly probable 

 that these results will be confirmed by longer tests, as the soil of that farm 

 had been depleted by a still longer period of exhaustive husbandry than that 

 which had brought the Wooster farm to its present condition." 



The addition of acid phosphate to farmyard manure at the rate of 40 lbs. 

 to the ton of manure has given increased yields. 



[Field crops] work of the Belle, Fourche reclamation project experiment 

 farm in 1914, B. Aune (U. S. Dept. Agr., Bur. riant Indus., Work Belle 

 Fourche Expt. Farm, 1914, pp. 1-6, S-U, 16, pj. i).— This reports the con- 

 tinuation of work previously noted (E. S. R., 32, p. 430), and gives data on cli- 

 matic and crop conditions of the project in South Dakota, together with acreage, 

 yields, and farm values of crops produced in 1914, an inventory of live stock, and 

 notes on cooperative work. Yields of the rotation crops are given for 1914 and 

 the average yields compared with those of 1912 and 1913. The average sugar 

 content of beets for 1912, 1913, and 1914 was 14.8, 19.1, and 22.1 per cent, 

 respectively. 



Data show a decided increase in yields of all crops in 1914 over the preceding 

 seasons, except with potatoes. 



"Beets after oats (manured) have given a higher average yield for the three 

 years than beets after oats without manure. The difference, though, in favor 

 of manured oats was not large until 1914, when the average of the plats after 

 the manured oats was 1.3 tons higher than the average of the plats after oats 

 without manure. Corn after beets has shown a decided effect of the preceding 

 crop. In the seasons of 1913 and 1914 corn after beets had an unhealthy appear- 

 ance during the early part of the summer and the yields obtained were compara- 

 tively low. Potatoes after manured beets have shown an increase in yield over 

 potatoes after beets without manure, while potatoes after manured oats have 

 not yielded any higher than potatoes after oats without manure. Spring wheat 

 after alfalfa has produced high yields all three years." 



