PLANT MORPHOGENESIS FOR SCIENTIFIC MANAGEMENT OF RANGE RESOURCES 



45 



Table 7. — Effect of soil temperature on the uptake of P. K. Ca, Mg. total and nitrate N by three 



forage grasses, final harvest, 1967 



Soil 

 temperature 



Species 



P 1 



K 1 



Ca 



Mg 1 



Total 

 nitrogen * 



Nitrate 

 nitrogen ' 



Ambient 



32° C. 



21° C. 



10° C. 



Average 



CV, percent 



Potomac 

 S-37 



Climax 



Average 



Potomac 



S-37 



Climax 



Average 



Potomac 



S-37 



Climax 



Average 



Potomac 



S-37 



Climax 



Average 



Potomac 



S-37 



Climax 



Average 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



0.39 be 



1.0 



de 



0.48 



cd 



0.50 ab 



3.98 ab 



0.040 be 



0.37 cd 



1.2 



de 



0.56 



a 



0.53 a 



4.05 ab 



0.048 abc 



0.35 de 



2.1 



b 



0.41 



e 



0.39 d 



3.56 cd 



0.045 abc 



0.37 B 



1.4 



B 



0.48 



A 



0.47 A 



3.86 A 



0.044 A 



0.33 e 



2.8 



a 



0.44 



de 



0.41 cd 



3.82 be 



0.036 c 



0.33 e 



3.0 



a 



0.41 



e 



0.36 e 



3.84 be 



0.065 a 



0.27 f 



2.7 



a 



0.30 



f 



0.30 e 



3.60 cd 



0.057 ab 



0.31 C 



2.8 A 



0.38 



B 



0.36 B 



3.75 A 



0.052 A 



0.39 be 



1.2 



de 



0.46 



cde 



0.52 ab 



4.00 ab 



0.039 ,bc 



0.40 be 



1.3 



(1 



0.56 



a 



0.46 be 



4.16 a 



0.050 abc 



0.35 de 



1.9 



be 



0.43 



de 



0.42 cd 



3.66 cd 



0.054 abc 



0.38 B 



1.5 



B 



0.49 



A 



0.47 A 



3.94 A 



0.048 A 



0.42 b 



0.9 



o 



0.50 



be 



0.55 a 



3.47 d 



0.014 d 



0.46 a 



1.0 



de 



0.54 



ab 



0.52 ab 



3.59 cd 



0.013 d 



0.34 de 



1.7 



c 



0.43 



de 



0.36 d 



3.18 e 



0.012 d 



0.41 A 



1.2 



B 



0.49 



A 



0.47 A 



3.41 B 



0.013 B 



0.38 X 



1.5 



Y 



0.47 



Y 



0.50 X 



3.82 X 



0.032 Y 



0.39 X 



1.6 



Y 



0.52 



X 



0.46 Y 



3.91 X 



0.044 X 



0.33 Y 



2.1 



X 



0.39 



z 



0.37 Z 



3.50 Y 



0.042 X 



5.4 



11.8 



0.9 



7.9 



4.3 



26.4 



1 Values within each column with the same letter are from the same statistical population at the 5-percent level 

 of significance. Capital letters are used for main effect. 



Many findings from these soil temperature 

 studies were similar to research conducted in con- 

 trolled growth chambers and greenhouses while 

 others were different. Modifications of light in- 

 tensity, day length, and moisture on such plots 

 may help us to understand some of the differences 

 found and make such field facilities more useful 

 in future studies. 



Literature Cited 



(1) Adams, J. E. 



1967. EFFECTS OF MULCHES AND BED CONFIGURATION. 

 I. EARLY-SEASON SOIL TEMPERATURE AND EMER- 

 GENCE OF GRAIN SORGHUM AND CORN. AgTOn. J. 



59: 595-599. 



(2) Alberda, Th. 



1957. THE effects OF cutting, LIGHT INTENSITY AND 

 NIGHT TEMPERATURE ON GROWTH AND SOLUBLE 

 CAJBBOHYDRATE CONTENT OF LOLIUM PERENNE L. 



Plant and Soil 8: 199-230. 



(3) Allmaras, R. R.. W. C. Burrows, and W. E. Larson. 



1964. EARLY GROWTH OF CORN AS AFFECTED BY SOIL 



temperature. Soil Sci. Soc. Proa 28: 271-275. 



(4) Anslow, R. C. 



1968. THE PRODUCTION OF DRY MATTER BY SWARDS OF 

 PERENNIAL RYEGRASS, DIFFERING IN AVERAGE AGE 



of foliage. .1. British Grassl. Soc. 23: 195-201. 



(5) Auda, H., R. E. Blaser, and R. H. Brown. 



1966. tillering and carbohydrate contents of 

 orchardgrass as influenced by environment- 

 al factors. Crop Sci. 6 : 139-143. 



