PLANT MORPHOGENESIS FOR SCIENTIFIC MANAGEMENT OF RANGE RESOURCES 



165 



Range. Growing season precipitation was near 

 average in 1966 and was the highest recorded at 

 the site in 1967. Standing vegetation varied from 

 a low of 139 kg./ha. in 1965 to a high of 1,060 

 in 1967. 



Herbage growth occurred in 14 of the 21 pe- 

 riods observed. During eight of these periods, a 

 growth rate exceeding 9 kg./ha./day was at- 

 tained. Table 6 shows the standing vegetation 

 available at the beginning of each of these pe- 

 riods and the rate of herbage growth during the 



period. Growth rates of over 9 kg./ha./day oc- 

 curred when amounts of standing vegetation va- 

 ried from 187 to 939 kg./ha. 



Herbage growth rate varies with the amount 

 of water available, temperature conditions, and 

 the amount of leaf material present. When mois- 

 ture and temperature conditions present an op- 

 portunity for herbage growth, reasonable for- 

 age production can be expected through a rela- 

 tively wide range in the amount of standing vege- 

 tation present. 



Table 4. — Standing vegetation, forage grazed, herbage growth, and ■precipitation on pasture* 



7W in 1966 











Standing vegetation * 





Herbag 







At end 



Difference 



e growth 





Period 







of 



beginning and 



Forage 













From 



To 



Days 



Precipitation 



period 



end of period 



grazed 



Period 



Per day 







Number 



Cm. 



Kg./ha 



Kg./ha. 



Kg./ha. 



Kg./ha. 



Kg./ha. 







6/22 











425 











6/23 



6/28 



6 



5.66 



510 



85 



7 



92 



15.3 



6/29 



7/12 



14 



0.08 



465 



—15 



10 



—35 



—2.5 



7/13 



7/26 



14 



0.97 



363 



—102 



10 



—92 



—6.6 



7/27 



8/9 



14 



1.04 



436 



73 



10 



83 



5.9 



8/10 



8/16 



7 



7.90 



609 



173 



6 



179 



25.6 



8/17 



9/9 



24 



0.48 



684 



75 



16 



91 



3.8 



1 Grasses and sedges, oTendry. 



Table 5. — Standing vegetation, forage grazed, herbage growth, precipitation on pasture 



7W in 1967 











Standing vegetation 1 





Herbag 





Period 



At end 



Difference 



e growth 











of 

 period 



beginning and 

 end of period 



Forage 

 grazed 







From 



To 



Days 



Precipitation 



Period 



Per day 







Number 



Cm. 



Kg./ha. 



Kg./ha. 



Kg./ha. 



Kg./ha. 



Kg./ha. 







5/28 











390 











5/29 



6/11 



14 



11.56 



525 



135 







135 



9.6 



6/12 



6/25 



14 



973 



566 



41 



16 



57 



4.1 



6/26 



7/10 



15 



8.08 



819 



253 



11 



264 



17.6 



7/11 



7/24 



14 



4.11 



939 



120 



11 



131 



9.4 



7/25 



8/7 



14 



0.15 



1059 



120 



29 



149 



10.6 



8/8 



8/21 



14 







1060 



1 



25 



26 



1.9 



8/22 



9/4 



14 



2.92 



969 



—91 



25 



—66 



—4.7 



1 Grasses and sedges, ovendry. 



