Sampling Procedures for Estimates of Weed Yields in Corn Plots

Mature yellow foxtail [Setaria glauca (L.) Beauv.] infestations, growing in rows of corn, were harvested in 3 foot segments from paired 30 foot rows of corn. Basic analyses of variance were calculated so that the variances of plot sizes involving multiples of 3 feet could be determined and compared....

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Veröffentlicht in:	Weeds (Urbana) 1965-10, Vol.13 (4), p.357-360
Hauptverfasser:	Staniforth, D. W., W. G. Lovely, Cady, F. B.
Format:	Artikel
Sprache:	eng
Schlagworte:	Corn Crop harvesting Graph theory Herbicides Infestation Random sampling Sampling methods Statistical discrepancies Weed control Weeds
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description	Mature yellow foxtail [Setaria glauca (L.) Beauv.] infestations, growing in rows of corn, were harvested in 3 foot segments from paired 30 foot rows of corn. Basic analyses of variance were calculated so that the variances of plot sizes involving multiples of 3 feet could be determined and compared. Precision indices were calculated for harvesting various fractions of the plot area. Loss of precision did not exceed 25 percent when only 40 percent of the total area was harvested in random samples of 1-row × 3 feet, or in multiples of this basic unit. Practical implications of the findings are related to estimates of weed yields in crop-weed ecology studies and herbicide evaluation tests.
doi_str_mv	10.2307/4040895
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Practical implications of the findings are related to estimates of weed yields in crop-weed ecology studies and herbicide evaluation tests.</description><subject>Corn</subject><subject>Crop harvesting</subject><subject>Graph theory</subject><subject>Herbicides</subject><subject>Infestation</subject><subject>Random sampling</subject><subject>Sampling methods</subject><subject>Statistical discrepancies</subject><subject>Weed control</subject><subject>Weeds</subject><issn>0096-719X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1965</creationdate><recordtype>article</recordtype><recordid>eNp1j0tLw0AUhWehYK3iX5iF4Cp6M49k7kaQUB9QaKEFdRUmMzeSkmbKTFz47420W1eHAx-H8zF2k8O9kFA-KFBgUJ-xGQAWWZnjxwW7TGkHoFHrYsYeN3Z_6Lvhi69jcOS_IyXehsgXaez2dpxaaPk7keefHfU-8W7gVYgDX_dhTFfsvLV9outTztn2ebGtXrPl6uWtelpmDlFnXmppi7zRpRJovG3I-dKZVopG-YYKRANWeEPGK49GElqhlCyUsxMLTs7Z3XHWxZBSpLY-xOld_KlzqP9M65PpRN4eyV0aQ_wX-wXp21Kg</recordid><startdate>19651001</startdate><enddate>19651001</enddate><creator>Staniforth, D. 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W.</creatorcontrib><creatorcontrib>W. G. Lovely</creatorcontrib><creatorcontrib>Cady, F. B.</creatorcontrib><collection>CrossRef</collection><jtitle>Weeds (Urbana)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Staniforth, D. W.</au><au>W. G. Lovely</au><au>Cady, F. B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sampling Procedures for Estimates of Weed Yields in Corn Plots</atitle><jtitle>Weeds (Urbana)</jtitle><date>1965-10-01</date><risdate>1965</risdate><volume>13</volume><issue>4</issue><spage>357</spage><epage>360</epage><pages>357-360</pages><issn>0096-719X</issn><abstract>Mature yellow foxtail [Setaria glauca (L.) Beauv.] infestations, growing in rows of corn, were harvested in 3 foot segments from paired 30 foot rows of corn. Basic analyses of variance were calculated so that the variances of plot sizes involving multiples of 3 feet could be determined and compared. Precision indices were calculated for harvesting various fractions of the plot area. Loss of precision did not exceed 25 percent when only 40 percent of the total area was harvested in random samples of 1-row × 3 feet, or in multiples of this basic unit. Practical implications of the findings are related to estimates of weed yields in crop-weed ecology studies and herbicide evaluation tests.</abstract><pub>Weed Science Society of America</pub><doi>10.2307/4040895</doi><tpages>4</tpages></addata></record>
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subjects	Corn Crop harvesting Graph theory Herbicides Infestation Random sampling Sampling methods Statistical discrepancies Weed control Weeds
title	Sampling Procedures for Estimates of Weed Yields in Corn Plots
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