represents such as gram-calories per square centimeter per 

 year. (2) The innate capacity of an environment to produce 

 plant and animal life. (3) The capacity of a soil to produce 

 a certain kind of crop under a defined set of management 

 conditions. 



Profile (Soil) 



A vertical section of soil through all its horizons into 

 the parent material, cf. A horizon. 



Profundal (Zone) 



The body of deep water and the bottom of lakes below 

 the depth of effective penetration of light, cf. Abyssal. 



Proliferation 



The rapid development of new growth such as the pro- 

 duction of new parts from buds, offsets, and other organs. 



Proliferous 



Refers to the ready vegetative reproduction by means of 

 organs such as buds and offsets; the development of leafy 

 shoots from a flower or flower head or other organ. 



Propagate 



To increase the number of plants vegetatively by bulbs, 

 conns, cuttings, or other plant parts. 



Propagule 



Any part of a plant that when it is separated from a plant 

 will give rise to a new individual, cf. Diaspore, Disseminule. 



Proper Stocking 



The number of individual livestock in a grazing unit that 

 utilizes the herbage without permanent deterioration of the 

 vegetation or the soil. cf. Overstocking. 



Proper Use Factor 



The maximum percentage of the total amount of annual 

 forage production of a species in a given area within easy 



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