FIELD CROPS. 981 



year. The height of stalks and size of ears increased with lateness of 

 maturity. Of 13 varieties tested during- 5 years Boone County White 

 gave the largest yield, 71.5 bu. per acre, followed by Burr White, 61.9 

 bu., and Learning, 60.7 bu. per acre. The medium maturing varieties 

 averaged for 7 years 65.2 bu., the late varieties 58.8 bu., and the early 

 varieties 55.5 bu. ; the yellow varieties averaged for 7 years 60.3 bu. per 

 acre, and the white varieties 63.2 bu. 



Time of planting (pp. 16-18). — Burr White was planted at intervals 

 of a week from April 6 to June 22; the average yield for 7 years was 

 greater from planting from May 11 to May 18. The variation was 

 slight for the dates between A\)Yil 27 and May 25. 



Thickness ofplanHnfj (pp. 18, 19). — In 1894, 2, 3, 4, and 5 kernels were 

 planted in hills 3 ft. 8 in. apart each way; the yield from planting 2 

 kernels was 40.2, 3 kernels 46, 4 kernels 49, and 5 kernels 48 bu. per 

 acre. In another field with 3 kernels per hill the yield was 44.6, and 

 with 4 kernels 50.5 bu. per acre. 



Continuous corn cropping compared with rotation of crops (pp. 19, 20). — 

 Corn grown in rotation with oats and clover yielded 40 per cent mora 

 than corn in continuous culture. Tabulated data give the yields in 

 detail. 



Cross fertilization (pp. 19, 20). — From cross fertilized plants seed was 

 selected in 1892 and again in 1893, the latter, together with both parent 

 varieties, being used for the crop of 1894. The average increase in 

 yield in 1894 from the cross fertilized seed was 12 bu. per acre. 



Betasseling (pp. 21-23). — The tassels were removed from stalks on 

 alternate rows; on the detasseled rows the yield was 56.5 bu., and on 

 those not detasseled 50 bu. per acre. The increase in yield was greater 

 where the tassels were removed early than where they were removed 

 later. Contradictory results secured in previous years and at other 

 stations are briefly noted. "If an increase in grain is secured by 

 detasseling, it is most likely to be on poor soil or in dry seasons. It 

 seems that the injury done the plants sometimes reduces the yield." 



Corn, W. "W. Cooke and F. L. Watrous [Colorado Sta. Bui. 30, 

 pp. 12-21, 24,25). — Eight varieties of flint corn and 14 of dent corn 

 were tested. The average yield of dry matter per acre was with the 

 small flint varieties 2.70 tons, with the large flint varieties 2.51 tons, 

 with the small dent varieties 3.60 tons, and with the large dent varie- 

 ties 3.38 tons. The largest yield of corn, 43 bu. per acre, was made by 

 the small dent varieties Huron and White Pearl. The earliest variety 

 was a small flint, Will 70-Day Gehu, which yielded 37.8 bu. of corn per 

 acre, and which seems adapted to many portions of the State which are 

 generally regarded as too cold for corn. 



Eed Cob corn cut September 29 aftbrded no more dry matter per acre 

 than when cut September 5. " The figures seem to show that in this 

 part of Colorado, so near the foothills, corn can not be depended on to 

 grow after the first week in September, and such varieties should be 

 chosen as will reach the glazing stage by that time.'' 



