1919] FIELD CROPS. 141 



per htll to 1,323.5 lbs. for 5 plants per hill. Spacing cotton different distances 

 in drill rows 3.5 ft. apart resulted in average yields ranging from 1,011.9 lbs. 

 per acre for plants spaced 36 in. apart to 1,150.1 lbs. for those spaced 3 in. apart. 

 Observations on spacing and time of thinning showed little difference in yield 

 between 6 and 12 in. spacings, while late thinning (with the plants 10 to 12 in. 

 high) produced only 984.6 lbs. of seed cotton per acre, as compared with 1,042.4 

 lbs. from early thinning. With the plants spaced at a constant distance in the 

 row and with the rows 3, 3.5, and 4 ft. apart, yields of 1,071.2, 1,112.3, and 

 1,114.8 lbs. per acre, respectively, were secured. With a constant number of 

 plants per acre (8,750), rows spaced 3, 4, 5, and 6 ft. apart, produced 1,264.7, 

 1,234.2. 1,299.2, and 1,235.5 lbs., respectively. It is stated that replanting with 

 cotton where two-thirds of a stand was secured was not prolitable, while re- 

 planting with corn practically ruined the cotton. 



Planting cotton on ridges or beds resulted in a total average yield of 1,398.4 

 l])s. of seed cotton per acre, as compared with 1,236 lbs. for level planting. 



In 1918 the best results were secured from plantings made the latter part of 

 May, although as a general practice late planting is deemed undesirable. Little 

 diffei'ence in yield was observed between deep and shallow cultivated plats. 

 Tests on the value of topping cotton are noted, but the results are deemed 

 inconclusive. 



Varieties of cotton, 1918, W. E. Ayres (Ai^Jcansas Sta. Bui. 159 (1919), pp. 

 16, fig. 1). — ^This reports the continuation of work previously noted (E. S. R., 

 40, p. 437). 



Of 109 varieties gi'own on small plats at the Scotts substation the three lead- 

 ing sorts both in total yield of lint and in value of seed and lint included Dixie, 

 Lewis No. 63, and Toole, with 723.7, 629, and 618.6 lbs. of lint per acre, respec- 

 tively. Experiments conducted at Scotts, Van Buren; Burdette, and Monticello 

 with 25 standard varieties of cotton resulted in average returns per acre for 

 seed and lint ranging from $137.74 for Webber 49 to $195.24 for Boykin 202. 

 The average length of lint was from i^ to ^ in. below the 1917 average, 

 thought to be due to adverse weather conditions. In a comparison of seed of 

 promising strains from different sources. Lone Star 1, valued at $187.18 per 

 acre, was first at Scotts, and Trice 1, with a total value of $165.54, first at Bur- 

 dette. Boykin 202, Express 28-350, and Station Trice, tested on a field scale at 

 Scotts, produced returns valued at $180.21, $170.78. and $145.04 per acre, respec- 

 tively. Cooperative tests with farmers to .study the local adaptation of prom- 

 ising varieties are also noted. 



The irrigation of oats, F. S. Harris and D. W., Pittman {Utah Sta. Bui. 167 

 {1919), pp. 3-20, flgfi. 15). — Irrigation experiments with oats conducted during 

 the period of 1916 to 1918, inclusive, on the Greenville experiment farm, are 

 described in which observations were made on the effect of 5-in. irrigations 

 applied at different stages of growth including the five-leaf, the early boot, the 

 blooming, and the dough stages, respectively, together with weekly irriga- 

 tions of either 1, 2.5, 5, or 7.5 in. beginning when the crop was 5 or 6 in. high 

 and continuing until it began to turn yellow. During 1916 and 1917 three 

 plats were manured at the rate of 5, 15, and 40 tons per acre, respectively, 

 each plat also receiving an application of 2.5 in. of water. Natural precipi- 

 tation during the years of the experiment averaged slightly more than 18 in. 

 The results secured are depicted graphically and briefly discussed, and may 

 be summarized as follows : 



Of the plats irrigated weekly that receiving 5 in. per week for 6 weeks 

 gave the highest average yield. 79.9 bu. per acre, this also being the maximum 

 yield secured in the experiment. The next highest yield, 79 bu., was obtained 

 with an application of only 15 in. of water applied in 5-in. incremeents at 



