. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. Investigations at Burlington, Colorado. 75 June, while during the remainder of the season a deficiency at all levels was not uncommon. Soil temperatures at a depth of 6 inches were highest at Lincoln (70° to 77° F.), and lowest at Burlington (64° to 72° F.) during the first half of June, but by the last week in June this relation was reversed, the soil at Burlington remaining warmest throughout the season. The average weekly differences were often 6° to 8° F., the Li


. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. Investigations at Burlington, Colorado. 75 June, while during the remainder of the season a deficiency at all levels was not uncommon. Soil temperatures at a depth of 6 inches were highest at Lincoln (70° to 77° F.), and lowest at Burlington (64° to 72° F.) during the first half of June, but by the last week in June this relation was reversed, the soil at Burlington remaining warmest throughout the season. The average weekly differences were often 6° to 8° F., the Lincoln soil being coldest, that at Phillipsburg intermediate, while the dry soils at Burlington had the highest temperature (fig. 33). The average daily air-temperature throughout the season was usually 5° to 7° F. colder at Burlington than at Phillipsburg, while that at Lincoln was generally higher than that at Phillispburg (fig. 34). The average day humidity at Lincoln ranged between 49 and 65 per cent and was usually higher than that at Burlington. However, the average night humidity at Lincoln (67 to 82 per cent) was usually exceeded by that at June July August 2 3 4 1^ 3 412 3 4. 0 L. J 1 I 1 ' 1 1 1 ' 1 ' Fig. 36.—Average daily evaporation at Lincoln (solid line), Phillips- burg (long broken lines), and Burlington (short broken lines), 1920. Burlington by about 8 per cent until late in July (fig. 29). Conditions at Phillipsburg were intermediate. The much greater daily range of both temperature and humidity at the Burlington station when compared with that at Lincoln is shown in figure 35. This combination of high temperature and low humidity, which occurs rather regularly in the afternoons at Bur- lington, when coupled with dry soil, are conditions very unfavorable for plant- growth. Wind movement is much greater at Burlington than at either of the other stations and is an important factor in desiccating both crops and soil. An average day velocity of 8 or 10 mi


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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcropsan, bookyear1922