IMTl FIELD CHOPS. 637 



staple cottons. A strain Introduced into Edgecombe County In 1915 produced 

 158 lbs. of lint per acre more than the prevailing local variety. 



Cooperative ear-to-row corn tests resulted in yields estimated to range be- 

 tween 23.1 and 58.7 bu. of shelled corn per acre from selections made the pre- 

 vious fall. The 10 best selections averaged 54.2 bu. while the average yield 

 of aU selected seed was 42 bu. per acre. 



Mammoth Yellow and Tokyo soy beans are recommended for seed production 

 for the eastern and lower Piedmont sections of the State, while Haberlandt 

 and WUson are recommended for the upper Piedmont and mountains. Virginia 

 is deemed superior to all varieties tested for hay production in all sections of 

 the State. 



Velvet beans have not proved succe-ssful In the western portion of the State, 

 while from Wake County eastward the varieties are classed as follows: For 

 hay production, Florida Velvet, One Hundred Day Speckle, Chinese, Wakula, 

 and Yokohama ; and for seed production. One Hundred Day Speckle, Wakula, 

 Yokohama, Chinese, and Florida Velvet. One Hundred Day Speckle Is deemed 

 best for North Carolina conditions generally. 



I>ally variation of water and dry matter in the leaves of corn and the 

 sorg'hums, E. C. Millee et ax. {U. S. Dept. Agr., Jour. Agr. Research, 10 

 (1917), No. J, pp. 11-^6, pi. 1, figs. 10). — In connection with studies previously 

 noted (E. S. R., 35, pp. 437, 529), the autlior has determined the daily varia- 

 tion of the water and dry matter content of the leaves of Pride of Saline corn, 

 Dwarf milo maize, and Blackhull Kafij corn. A knowledge of the variations 

 of the amount of water in the leaves was expected to throw light on the res- 

 tive ability of these plants to absorb water from the soil and transport it to 

 regions of loss through transpiration, while a study of the variations of dry 

 matter in the leaves was expected to show the relative power of the plants to 

 manufacture food under different climatic conditions. The experiments were 

 conducted during the summers of 1914, 1915, and 1916 at the Garden City 

 substation of the Kansas Experiment Station. 



Soil samples for moisture determinations were taken for each foot to a 

 depth of 6 ft. either a few days before or after the experimental work with 

 the leaves. The results of the determinations, together with the wilting co- 

 efficient and moisture equivalent for each of the several plats, are reported in 

 tabular form. 



Livingston's porous-cup atmometers with a coefficient of 74 were employed 

 to determine hourly evaporation. The atmometers were placed 2 ft. from the 

 ground, connected with burettes so that readings could be made to 0.1 cc, 

 and evaporation La cubic centimeters reported in tabular form for the different 

 periods of leaf sampling for each year of the experiment. 



Leaf samples, each with an area of 1 sq. cm., were taken every two hours 

 during an experiment from 80 representative plants of each variety. One leaf 

 was chosen on each plant to furnish all the samples desired for a given ex- 

 periment The samples were taken by means of a Ganong leaf punch. 



Nine experiments were conducted in 1914, two in 1915, and four in 1916. 

 Four of the 1914 experiments extended through the daylight hours only, all 

 others ranging from 24 to 40 hours in length. The amount of water and dry 

 matter for each square meter of leaf were determined every two hours for a 

 total of 22 days and 10 nights, and the percentage of water calculated on both 

 a wet and dry basis. The data obtained are presented in tabular form, ex- 

 pressed graphically, and the results discussed in some detail. 



The following summarized statement shows the variation of the water content 

 of the leaves of the plants studied during the three years 1914^1916: 



