scholarly journals Long-term trends in annual reproductive output of the scrub hickory: factors influencing variation in size of nut crop

2004 ◽  
Vol 91 (9) ◽  
pp. 1378-1386 ◽  
Author(s):  
J. N. Layne ◽  
W. G. Abrahamson
Keyword(s):  
Reproductive Output ◽  
Factors Influencing ◽  
Long Term Trends

The influence of rotation systems on long-term trends in wheat yield

1972 ◽  
Vol 23 (6) ◽  
pp. 935 ◽  
Author(s):  
BR Elliott ◽  
R Jardine
Keyword(s):  
Regression Model ◽  
Wheat Yield ◽  
Multiple Regression Model ◽  
Climatic Fluctuations ◽  
Yield Increase ◽  
Factors Influencing ◽  
Long Term Trends ◽  
Wheat Stubble ◽  
Yield Trends

The wheat yield trends of six rotation systems were examined over the 29-year period 1940-1968. The multiple regression model used incorporated variables to minimize the effect of climatic fluctuations and trends. All the rotation systems examined showed positive, almost linear, yield increases over the first 19 years (1940-1958). Over the final 10 years (1959-1968) those systems including a pasture phase continued to show a linear yield increase; other three-course systems (fallow, wheat, stubble crop) showed a less than linear yield increase; while the two-course system (fallow, wheat) showed a 22% yield decline. Possible factors influencing the yield trends are briefly discussed.

Commercial trawling in seagrass beds: bycatch and long-term trends in effort of a major shrimp fishery

2014 ◽  
Vol 513 ◽  
pp. 143-153 ◽  
Author(s):  
CD Stallings ◽  
JP Brower ◽  
JM Heinlein Loch ◽  
A Mickle
Keyword(s):  
Seagrass Beds ◽  
Shrimp Fishery ◽  
Long Term Trends
Sign in / Sign up

Export Citation Format

Share Document