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Border and Competition Effects in Millet and Sudangrass Plots Characterized by Different Levels of Nitrogen Fertilization 1
Author(s) -
Drapala W. J.,
Johnson Corwin M.
Publication year - 1961
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1961.00021962005300010006x
Subject(s) - statistician , competition (biology) , agricultural experiment station , citation , agronomy , agricultural science , mathematics , library science , computer science , agriculture , history , environmental science , biology , statistics , ecology , archaeology
I competition effects are known to exist in many areas of field experimentation. Such effects are commonly referred to as border effects and can be recognized readily since the growth pattern and/or yields of the plants near the perimeter of the plot are decidedly different from the growth pattern of plants in the central portion of the plot. Although border effects shown by rows of contiguous plots can arise as a result of competition by the sward and root system for moisture, light, and soil nutrients, the latter may inherently be associated with variation in such factors as varietal or species maturity, plant height, degree of lodging, disease and herbicide reactions, drouth and heat tolerance, winter hardiness, frequency of clipping, rates of seeding, rates of fertilization, and habit of growth. The elimination of border influences is accomplished by leaving a nonexperimental margin of predetermined magnitude—the size of which usually varies with the kind of crop plant which is grown. If border effects are not taken