crop such as wheat has been harvested; for the purpose of 

 plowing it under the following spring to increase organic 

 matter in the soil. 



Stubble Mulch 



The residues of a crop left on the soil surface as a mulch 

 to prevent or reduce erosion when preparing the land for 

 planting another crop. 



Stumpage 



The value of timber as it stands in a forest; the uncut 

 timber. 



Style 



The portion of the pistil between the stigma and the 

 ovary in a flower. 



Subalpine 



Refers to the region or zone in mountains below the 

 treeless Alpine (q. v.) region, characterized in North America 

 by coniferous forests, especially spruce and fir. 



Subarctic 



(1) Refers to the region south of the Arctic (q. v.) region 

 and includes the northern part of the region south of the 

 geographical timber line. (2) Boreal. 



Sub-boreal Period 



The climatic period from about 2500 B. C. to about 

 700 B. C. according to Blytt and Sernander, a period drier 

 than the preceding Atlantic (5500-2500 B. C.) and the follow- 

 ing Subatlantic (700 B.C. to the present) periods, cf. Boreal 

 period. 



Subclimax 



A subfinal stage in Succession in which further develop- 

 ment is inhibited because of the influence of some factor 

 other than the climatic factors, cf. Proclimax, Serclimax. 



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