1918] FIELD CROPS. 335 



ence among the cowpea varieties tested. A planting rate of 20 lbs. of seed per 

 acre consisting of 1 part cowpeas and 8 parts sorghum gave a yield of 8,350 

 lbs. of cured hay per acre. 



In corn variety tests conducted during 1913 and 1914 Surecropper, Mammoth 

 White, and Cater were the leading varieties, with average yields of 83.87, 31.74, 

 and 31.09 bu. per acre, respectively. Ear-to-row testing to determine the rela- 

 tion between certain characters of corn and yield is held to indicate that seed 

 corn should be selected from a good stand of tall, leafy plants which are rela- 

 tively heavily stalked and that large, heavy ears with deep grains should be 

 chosen. 



Corn grown in rows 3 ft. apart, with the plants spaced 80, from 30 to 40, 

 and from 70 to 80 in. apart in the row, gave average yields of 18.91, 24.23, and 

 19.82 bu. per acre, respectively, for the period of 1912 to 1914, inclusive. Grow- 

 ing the same number of stalks of corn on the land but with different spacings 

 between hills resulted in average yields for the period of 1913-14, inclusive, 

 amounting to 28.32 bu. per acre for hills spaced 3 by 3 ft., 23.06 bu. for hills 

 spaced 6 by 1.5 ft., and 22.33 bu. for hills spaced in pairs of 3-ft. rows 9 ft. 

 apart, the stalks IS in. apart in the row. 



Corn grown alone and with cowpeas sown during the latter part of the grow- 

 ing period of the corn resulted in average yields of 21.68 and 20.6 bu. per acre, 

 respectively, for the period of 1912-13, inclusive. 



Field tests with various grasses have been undertaken to find a grass adapted 

 to planting in rotation. Rhodes grass gave a yield of 3,823 lbs. of cured hay 

 per acre in 1914, and rescue grass grown for seed yielded as high as 380 lbs. 

 per acre. Several hybrids of Texas blue grass and Kentucky blue grass are 

 reported as promising for this region. Sudan grass seeded broadcast at rates 

 of 20 and 80 lbs. per acre in 1913 gave yields of 4,000 and 2,800 lbs. of cured 

 hay per acre, respectively. Planted in 18- and 36-in. rows at a 10-lb. seeding 

 rate, Sudan grass yielded 556 and 361 lbs. of seed per acre, and 2,950 and 

 2,050 lbs. of cured hay per acre, respectively. Plantings of Sudan grass in 

 1914 gave an average yield of 6.534.5 lbs. of forage and 147.6 lbs. of seed 

 per acre. 



The use of fertilizers and lime is said to have been less profitable on the 

 soils of the substation than crop rotation or the use of improved crops. 



October plowing for cotton in 1913 resulted in an average yield of 769.63 lbs. 

 of seed cotton per acre as compared with 743.2 lbs. for January plowing. 

 Depth-of-plowing tests resulted in yields of seed cotton ranging from 735 lbs. 

 per acre for a plowing depth of 4 in. to 868.12 lbs. for a plowing depth of 12 in. 



Cotton grown on land dynamited in seed bed preparation gave an average 

 yield of 768 lbs. of cotton per acre for the period of 1913-14, inclusive, while 

 cotton grown on land not dynamited yielded 793.7 lbs. of seed cotton. Corn 

 grown on dynamited land in 1913 yielded 23.7 bu. per acre as compared with 

 a yield of 25.75 bu. for corn grown on land not dynamited. 



[Report of field crops work], F. Watts (Imp. Dept. Agr. West Indies, Rpt. 

 Agr. Dept. Antigua, 1915-16, pp. 5-13, 14, 19, 20). — Continuing work previously 

 noted (E. S. R., 36, p. 735), variety tests are reported with sweet potatoes, 

 cassava, eddoes and tanuias, and yams for the year 1915-16. 



Fertilizer and distance-of-planting tests with corn are briefly noted. A yield 

 of 13.6 bu. of shelled corn per acre was realized from a fertilizer treatment of 

 30 lbs. of phosphoric acid as basic slag and 40 lbs. of potash as sulphate of 

 potash, as compared with a yield of 6.3 bu. from the untreated check. Twelve 

 bu. per acre were obtained from a 40-lb. application of potash as sulphate alone. 

 Later plantings to study the residual effect of the fertilizer treatments gave a 



