The influence of weed competition on crop yield

Abstract The mean yield of weedy crops relative to that of weed-free crops, and the critical periods of crop-weed competition are calculated for twenty-six different crop species. Experimental data from the literature are used as a base for the calculation. As a result, the crops are placed in hierarchical order of declining competitive ability, with wheat at the top of the list and carrots and onions at the foot of it.

[1]  G. Warren,et al.  Competition Between Purple Nutsedge and Vegetables , 1975, Weed Science.

[2]  C. Bisen,et al.  A note on the evaluation of cultural and chemical methods of weed control in soybean , 1972 .

[3]  G. Wicks,et al.  Competition Between Annual Weeds and Sweet Spanish Onions , 1973, Weed Science.

[4]  J. Dawson.  Competition between Irrigated Sugar Beets and Annual Weeds , 1965 .

[5]  C. T. de Wit,et al.  Competitive interference of plant species in monocultures and mixed stands , 1968 .

[6]  W. J. Ethredge,et al.  Competition of Florida Beggarweed and Sicklepod with Peanuts I. Effects of Periods of Weed-free Maintenance or Weed Competition , 1975, Weed Science.

[7]  H. A. Roberts,et al.  The Effect of Weed Removal at Different Times on the Yield of Bulb Onions , 1971 .

[8]  G. Wicks,et al.  The Effect of Weed Removal Treatments on Sorghum Growth , 1967 .

[9]  J. Harrington,et al.  COMPETITIVE EFFICIENCY OF WEEDS AND CEREAL CROPS , 1934 .

[10]  K. C. Feltner,et al.  Competition of Velvetleaf, Prickly Sida, and Venice Mallow in Soybeans , 1976, Weed Science.

[11]  H. A. Roberts,et al.  Effects of weed competition for different periods on the growth and yield of red beet , 1973 .

[12]  O. C. Burnside,et al.  Soybean and Weed Yields as Affected by Irrigation, Row Spacing, Tillage, and Amiben , 1964 .

[13]  D. Staniforth,et al.  Corn‐Foxtail Competition Under Various Production Conditions1 , 1961 .

[14]  K. C. Feltner,et al.  Venice Mallow Competition in Soybeans , 1973, Weed Science.

[15]  L. V. Hill,et al.  Competitive Effects of Annual Weeds on Spanish Peanuts , 1969, Weed Science.

[16]  E. Knake,et al.  Effect of Time of Giant Foxtail Removal from Corn and Soybeans , 1969, Weed Science.

[17]  J. Dawson.  Competition between Irrigated Field Beans and Annual Weeds , 1964 .

[18]  E. Schweizer,et al.  Control of Kochia in Sugarbeets With Benzadox , 1970, Weed Science.

[19]  D. A. Dew.  An index of competition for estimating crop loss due to weeds , 1972 .

[20]  E. Knake,et al.  Giant Foxtail Seeded at Various Times in Corn and Soybeans , 1965 .

[21]  H. Curfs.  Systems development in agricultural mechanization with special reference to soil tillage and weed control. A case study for West Africa , 1976 .

[22]  R. Zimdahl,et al.  Influence of Weed Competition on Sugar Beets , 1967 .

[23]  E. Schweizer,et al.  Response of Sugarbeets and Weeds to Phenmedipham and Two Analogues , 1971, Weed Science.

[24]  S. Datta.  Chemical Weed Control in Tropical Rice in Asia , 1972 .

[25]  D. Swan,et al.  Competition of Fiddleneck with Wheat , 1962 .

[26]  J. Doll,et al.  Methods of weed control in cassava , 1976 .

[27]  Gail A. Wicks,et al.  Influence of Tillage, Row Spacing, and Atrazine on Sorghum and Weed Yields from Nonirrigated Sorghum across Nebraska , 1964 .

[28]  L. Kasasian,et al.  Critical periods for weed competition , 1969 .

[29]  D. Rydrych.  Competition Between Winter Wheat and Downy Brome , 1974, Weed Science.

[30]  P. Thomas,et al.  Weed Competition in Cotton , 1971 .

[31]  F. N. Anderson,et al.  Weed Control in Sugarbeets with Herbicides and Cultivation , 1969, Weed Science.

[32]  A. F. Wiese,et al.  Effect of Weeds and Cultural Practices on Sorghum Yields , 1964 .

[33]  K. C. Gautam,et al.  Losses in Crop Yield in India Due to Weed Growth , 1968 .

[34]  H. Gill,et al.  Chemical Control of Phalaris minor and Avena ludoviciana in Wheat , 1977 .

[35]  C. R. Weber,et al.  Effects of Annual Weeds on the Growth and Yield of Soybeans 1 , 1956 .

[36]  H. Jorge Nieto,et al.  Critical Periods of the Crop Growth Cycle for Competition from Weeds , 1968 .

[37]  C. Spitters,et al.  Competition between crop and weeds: a system approach , 1982 .

[38]  E. Schweizer,et al.  Competition Between Kochia and Sugarbeets , 1969, Weed Science.

[39]  B. Johnson.  Effect of Weed Competition on Sunflowers , 1971 .

[40]  E. Schweizer,et al.  Competition Between Sugarbeets and Five Densities of Kochia , 1971, Weed Science.

[41]  D. Staniforth.  Competitive Effects of Three Foxtail Species on Soybeans , 1965 .

[42]  R. Crowley,et al.  Competition of Prickly Sida with Cotton , 1977, Weed Science.

[43]  C. R. Weber,et al.  Effectiveness of the Rotary Hoe for Weed Control in Soybeans1 , 1958 .

[44]  G. Buchanan,et al.  Competition of Sicklepod with Soybeans , 1972, Weed Science.

[45]  E. R. Burns,et al.  Influence of Weed Competition on Cotton , 1970, Weed Science.

[46]  L. Anderson,et al.  Yellow Foxtail Competition in Grain Sorghum , 1969, Weed Science.

[47]  B. Onochie.  Critical Periods for Weed Control in Cassava in Nigeria , 1975 .

[48]  L. Robison,et al.  Broadcast or Banded Atrazine plus Propachlor with Tillage Variables in Corn , 1973, Weed Science.

[49]  M. Maun.  Ecological Effects of Barnyardgrass on Soybeans in a Greenhouse , 1977, Weed Science.

[50]  P. Thomas,et al.  Competition between maize and Rottboellia exaltata , 1975, The Journal of Agricultural Science.

[51]  L. Anderson,et al.  Tall Waterhemp Competition in Grain Sorghum , 1969, Weed Science.

[52]  O. Burnside.  Tolerance of Soybean Cultivars to Weed Competition and Herbicides , 1972, Weed Science.

[53]  G. Wicks,et al.  Influence of Weed Competition on Sorghum Growth , 1969, Weed Science.

[54]  J. D. Nalewaja,et al.  Effect of Duration of Wild Oat Competition in Flax , 1968, Weed Science.

[55]  M. I. Ashrif.  Effects of Fertilizer, Weeding and Pre-Emergence MCPB on Groundnuts in the Gambia , 1967 .