Corn (Zea mays) Yield in Relationship to Johnsongrass (Sorghum halepense) Population

Weed Science ◽  
1986 ◽  
Vol 34 (3) ◽  
pp. 449-451 ◽  
Author(s):  
Leo E. Bendixen
Keyword(s):  
Triticum Aestivum ◽  
Zea Mays ◽  
Glycine Max ◽  
Grain Yield ◽  
Sorghum Halepense ◽  
Kernel Development ◽  
Grain Yields ◽  
Herbicide Treatments ◽  
Maize Grain ◽  
Corn Grain

Corn (Zea maysL.) grain yield was measured in a 5-yr study at two locations in central Ohio in relationship to johnsongrass [Sorghum halepense(L.) Pers. # SORHA] populations infesting the plots. Herbicide treatments were EPTC + R-25788 (S-ethyl dipropyl carbamothioate) + (N,N-diallyl-2,2-dichloroacetamide) at 6.7 kg ai/ha to corn in a monoculture and in a 3-yr rotation of winter wheat (Triticum aestivumL.), corn, and soybeans [Glycine max(L.) Merr.], with each crop being grown each year. There were large increases in johnsongrass populations in the monocultures during the course of the 5-yr study, and corn grain yield fell to zero, even though ear formation was not greatly reduced. Conversely, johnsongrass populations in the rotation were low and maize grain yields and numbers of ears remained high. The differential in grain yields between the two treatments was apparently due chiefly to lack of pollination or kernel development, since ears were formed in approximately equal numbers, except for the last year.

Influence of Weed Control on Weed Population in Ridge-till Corn (Zea mays)

Weed Science ◽  
1996 ◽  
Vol 44 (4) ◽  
pp. 903-910
Author(s):  
Gail A. Wicks ◽  
Robert G. Wilson ◽  
Garold W. Mahnken ◽  
Gordon E. Hanson
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Field Studies ◽  
Grain Yields ◽  
Common Lambsquarters ◽  
Weed Population ◽  
Green Foxtail ◽  
Herbicide Treatments ◽  
Corn Grain

Field studies were conducted to determine the influence of annual herbicide treatments plus cultivation on weed populations and corn yields in ridge-till corn during a 3-yr period at Mitchell, NE, and a 7-yr period at North Platte, NE. When the experiment was initiated at North Platte, no weeds were present before corn planting. It took 4 yr before triazine-resistant kochia became a problem before corn planting in plots treated with atrazine, but these were controlled by other operations prior to corn harvest. In the cultivated check, green foxtail densities before harvest increased from 0 in 1985 to 32 plants 100 m−2in 1991. Annual applications of dicamba plus 2,4-D 10 d early preplant followed by cultivation controlled triazine-resistant kochia and velvetleaf, but common lambsquarters, nightshade species, and green foxtail increased. Volunteer corn was controlled with cultivation. After 3 yr at Mitchell, the annual weed population increased 10-fold in the cultivated check. Thus, corn yields were reduced 64% with two cultivations compared with an annual early preplant application of dicamba plus 2,4-D followed by alachlor plus cyanazine PRE and two cultivations. With two cultivations under low annual weed populations at North Platte, grain yield from the cultivated check treatment was not different from annual treatments of herbicides after 7 yr. Metolachlor plus atrazine occasionally caused a reduction in corn grain yields.

The Critical Period of Johnsongrass (Sorghum halepense) Control in Field Corn (Zea mays)

Weed Science ◽  
1996 ◽  
Vol 44 (4) ◽  
pp. 944-947 ◽  
Author(s):  
Hani Z. Ghosheh ◽  
David L. Holshouser ◽  
James M. Chandler
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Critical Period ◽  
Sorghum Halepense ◽  
Control Methods ◽  
Field Corn ◽  
Hand Weeding ◽  
Corn Grain ◽  
Corn Grain Yield

Experiments were conducted from 1989 to 1991 to determine the critical period of johnsongrass control in field corn. Maximum weed-infested and weed-free periods of 0 to 20 wk after corn emergence were maintained by either hand weeding or nicosulfuron application. Interference duration effects on corn grain yield were not affected by johnsongrass control methods. The critical period for johnsongrass control was determined to be between 3 and 6.5 wk after corn emergence to avoid losses above 5% of yield produced by full-season weed-free corn.

Influence of Density on Johnsongrass (Sorghum halepense) Interference in Field Corn (Zea mays)

Weed Science ◽  
1996 ◽  
Vol 44 (4) ◽  
pp. 879-883 ◽  
Author(s):  
Hani Z. Ghosheh ◽  
David L. Holshouser ◽  
James M. Chandler
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Maximum Density ◽  
Sorghum Halepense ◽  
Constant Density ◽  
Yield Losses ◽  
Density Dependent ◽  
Field Corn ◽  
Corn Grain ◽  
Corn Grain Yield

Experiments were conducted from 1990 to 1994 to investigate the density-dependent effects of rhizome and seedling johnsongrass on the magnitude of full-season interference in field corn. Corn grain yield was decreased as rhizome johnsongrass density increased. A maximum density of 3 rhizome johnsongrass plants 9.8 m−1of row was considered critical to avoid yield losses above 5% of full-season weed-free corn. Interference of johnsongrass plants originating from seed and growing at densities up to 128 plants 9.8 m−1of row did not affect grain yield. Seedling johnsongrass plants growing at a constant density of 9.8 plants m−1of row did not affect yield from corn planted at five densities.

Johnsongrass (Sorghum halepense) Management Systems

1988 ◽  
Vol 2 (1) ◽  
pp. 64-67 ◽  
Author(s):  
Leo E. Bendixen
Keyword(s):  
Triticum Aestivum ◽  
Zea Mays ◽  
Glycine Max ◽  
Winter Wheat ◽  
Sorghum Halepense ◽  
Management Systems ◽  
Second Best

Crop-herbicide systems for johnsongrass [Sorghum halepense(L.) Pers. # SORHA] control were compared in a 5-yr study at two locations in central Ohio. Monocultures of corn (Zea maysL.) and soybeans [Glycine max(L.) Merr.] were compared with a 3-yr rotation of corn, soybeans, and winter wheat (Triticum aestivumL.). Johnsongrass was controlled most effectively (over 95%) when glyphosate [N-(phosphonomethyl) glycine] was applied to emerged johnsongrass, followed by moldboard plowing, preplant incorporated (PPI) application of trifluralin [2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine], then soybean planting (MS-G-T). The second best control was in corn (over 90%) treated PPI with EPTC (S-ethyl dipropylcarbamothioate) in the rotation (RC-E). Johnsongrass control was least in monocultured corn treated PPI with EPTC (MC-E) and in monocultured soybeans treated PPI with trifluralin (MS-T).

Effect of Preplant Tillage, Post-Plant Cultivation, and Herbicides on Weed Density in Corn (Zea mays)

1993 ◽  
Vol 7 (3) ◽  
pp. 728-734 ◽  
Author(s):  
Robert G. Wilson
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Weed Species ◽  
Common Lambsquarters ◽  
Weed Density ◽  
Proso Millet ◽  
Plant Cultivation ◽  
Herbicide Treatments ◽  
Corn Grain

A four-year experiment was conducted near Scottsbluff, NE to evaluate the effect of different methods of preplant tillage, post-plant cultivation, and herbicides on weed density and grain yield. Ridge-till enhanced the development of kochia and reduced the density of wild proso millet and common lambsquarters. Tandem disking increased longspine sandbur and redroot pigweed density whereas moldboard plowing increased common sunflower density. Cultivation reduced weed density 86% but weeds that remained after cultivation reduced corn grain yield by 40% as compared with a hand-weeded control. Weed control treatments that integrated cultivation and herbicides controlled a broader spectrum of weed species than cultivation or herbicide treatments alone.

scholarly journals DESEMPENHO DA SOJA EM SUCESSÃO AO CONSÓRCIO DE MILHO SEGUNDA SAFRA COM DIFERENTES DENSIDADES DE Crotalaria spectabilis

Nativa ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 649
Author(s):  
Edison Ulisses Ramos Junior ◽  
Eduardo Megier de Ramos ◽  
Luana Manoela Konzen ◽  
Alexandre Ferreira da Silva ◽  
Flávio Dessaune Tardin ◽  
...  
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Grain Yield ◽  
Environmental Preservation ◽  
Input Use ◽  
Grain Productivity ◽  
Glycine Max L ◽  
The City ◽  
Crotalaria Spectabilis ◽  
Corn Grain

A demanda crescente por alimentos, associada à necessidade de preservação ambiental, e a disponibilidade limitada de terras para a expansão da área cultivada, tem demandado desenvolvimento contínuo de tecnologias que resultem no aumento da produtividade de grãos, na racionalização do uso de insumos, dos recursos ambientais e dos meios de produção. O presente trabalho teve como objetivo avaliar o desempenho da soja (Glycine max (L.) Merrill) semeada em sucessão ao consórcio de milho (Zea mays L.) segunda safra com diferentes densidades de Crotalaria spectabilis. O experimento foi semeado em 15 de fevereiro de 2016, em uma área experimental da Embrapa Agrossilvipastoril, na cidade de Sinop/MT. O delineamento utilizado foi de blocos ao acaso, com quatro repetições. Cada parcela apresentava 11 linhas com 0,45 cm de espaçamento entre si e 10 metros de comprimento, sendo considerada, como área útil, as três linhas centrais. Os tratamentos foram constituídos de 4 densidades da C. spectabilis, sendo 10, 20, 30 e 40 kg de sementes por ha, além da testemunha, com milho solteiro. A semeadura da soja foi realizada em outubro de 2016, sob as parcelas colhidas do consórcio de milho com crotalária. Ao final do ciclo, coletou-se 10 plantas da área útil de cada parcela, para que fossem avaliados os componentes de produção e produtividade da cultura. Observou-se que a crotalária não causou redução na produtividade de grãos do milho, porém em apenas um ciclo de consórcio, não permitiu que se obtivessem incrementos na produtividade de grãos da soja.Palavras-chave: diversificação de culturas; consórcio milho-crotalária; produtividade de grãos. PERFORMANCE OF SOYBEAN IN SUCCESSION TO MAIZE SECOND CROP INTERCROPPED WITH DIFFERENT SOWING DENSITY WITH Crotalaria spectabilis ABSTRACT: The growing demand for food, associated with the need for environmental preservation, and the limited availability of land for the expansion of cultivated area, has demanded continuous development of technologies that result in increased grain productivity, rationalization of input use, environment resources and the means of production. The objective of this work was to evaluate the performance of soybean (Glycine max (L.) Merrill) in succession to the intercropped of maize (Zea mays) second crop with different densities of Crotalaria spectabilis. The experiment was sowing on February 15, 2016, in an experimental area of Embrapa Agrossilvopastoral, in the city of Sinop/MT. The experimental design was a randomized complete block, with four replications. Each plot had 11 lines with 0.45 cm of spacing and 10 meters of length, being considered as useful area, the three central plots. The treatments consisted of 4 densities of C. spectabilis, being 10, 20, 30 and 40kg of seeds per hectare, besides the control with the single maize. The sowing of the soybean was carried out in October 2016, under the plots harvested from the maize intercropped with the Crotalaria, where the cultivar M 8210IPRO was used and at the end of the cycle 10 plants of the useful area of each plot were collected, so that Production components. With the results obtained, it was possible to observe that the crotalaria did not cause a reduction in corn grain yield, but in only one consortium cycle, it did not allow the increase of grain yield of the soybean. Therefore, the continuity of the work must be carried out in order to be able to obtain increases in soybean production in succession, and also to evaluate the best C. spectabilis density to be used in intercropping.Keywords: crop diversification; maize-crotalaria intercrop; grain yield.

Annual Grass Control in Corn (Zea mays) with Primisulfuron Combined with Nicosulfuron

1997 ◽  
Vol 11 (1) ◽  
pp. 171-175 ◽  
Author(s):  
Thomas L. Rabaey ◽  
R. Gordon Harvey
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Annual Grass ◽  
Grain Yields ◽  
Proso Millet ◽  
Field Corn ◽  
Giant Foxtail ◽  
Woolly Cupgrass ◽  
Corn Grain ◽  
Corn Grain Yield

Efficacy of primisulfuron and reduced rates of nicosulfuron on woolly cupgrass, wild-proso millet, and giant foxtail in field corn was evaluated in 1994 and 1995. Nicosulfuron was applied at 18, 27, and 36 g ai/ha alone and with 20 g ai/ha primisulfuron. Woolly cupgrass control from nicosulfuron at 18 and 27 g/ha was less than control from 36 g/ha (79% and 84% vs. 90%, respectively). Woolly cupgrass control was 5% greater when primisulfuron was combined with nicosulfuron at 27 and 36 g/ha than when nicosulfuron was applied alone. Corn grain yields were similar among all nicosulfuron plus primisulfuron treatments applied to control woolly cupgrass in 1994. In 1995, corn grain yield was increased 900 kg/ha when primisulfuron was combined with nicosulfuron at 18 g/ha compared to nicosulfuron applied at the same rate alone. Wild-proso millet control 3 WAT with nicosulfuron at 18 g/ha was less than control with nicosulfuron at 36 g/ha. Wild-proso millet control 8 WAT with nicosulfuron alone was greater than when nicosulfuron at any rate was applied with primisulfuron. No differences in corn grain yields were observed across nicosulfuron rates or combinations with primisulfuron to control wild-proso millet either year. Giant foxtail control and corn grain yield were not affected by nicosulfuron rate or combined applications of nicosulfuron and primisulfuron either year.

Cultivation and Herbicides for Weed Control in Corn

Weed Science ◽  
1968 ◽  
Vol 16 (2) ◽  
pp. 232-234 ◽  
Author(s):  
K. P. Buchholtz ◽  
R. E. Doersch
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Corn Yield ◽  
Triazine Herbicides ◽  
Grain Yields ◽  
Yield Increase ◽  
Weed Growth ◽  
Corn Grain ◽  
Corn Grain Yield

Corn (Zea mays L.) plots receiving broadcast spray applications of triazine herbicides without cultivation yielded as much as plots receiving the standard two cultivations for weed control. One cultivation resulted in an average 6% increase in corn grain yield on herbicide treated plots. This yield increase probably was due to improved weed control. Weed growth reduced grain yields an average of 1.23 bu/A for each 100 lb/A of dry weeds. In some experiments, increases in corn yield due to improved weed control by cultivation on plots treated with herbicides were less than increases expected based on weed growth reductions. This disparity may have been due to injury to the corn by cultivation.

scholarly journals Yields and Yield Components of Maize (Zea Mays L.) and Soybean (Glycine Max) as Affected by Different Tillage Methods

2015 ◽  
Vol 34 (4) ◽  
pp. 371-379
Author(s):  
Ivka Kvaternjak ◽  
Ivica Kisić ◽  
Marta Birkás ◽  
Andrija Špoljar ◽  
Dejan Marenčić
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Grain Yield ◽  
Yield Components ◽  
Zea Mays L ◽  
Soybean Seed ◽  
Kernel Weight ◽  
Yield And Yield Components ◽  
Maize Grain ◽  
Tillage Methods

Abstract At the experiment station of the Krizevci College of Agriculture, yield and yield components of maize (Zea mays L.) and soybean (Glycine max) grown in rotation under five different methods of tillage were investigated. The aim of this study was to determine the effect of different tillage methods on yield and yield components of maize and soybean. The results and the determined number of plants per hectare of maize and soybean show that more favorable conditions for germination are in variants where ploughing performed in the autumn (variants C, D and E). During a four-year study, the minimum number of plants per hectare of maize and soybean was found in variant A. The dry season in panicle stage of maize in 2006 has lowered yields compared to 2008, and the drought in 2007 during the seed-filling period reduced the yield and the 1000 kernel weight of soybean compared with 2009 in all variants of tillage methods. The highest grain yield of maize was recorded in variant B. During 2006, with the unfavorable weather conditions, the lowest grain yield of maize was recorded in variant E with intensive tillage treatment. The highest yield of soybean was recorded in variant E, but there were no statistically significant differences compared to variants with the reduction of additional tillage interventions (variant B, C and D). With respect to maize grain and soybean seed yield, variant A was the lowest. Considering the achieved yields of maize grain, there is a possibility of reducing additional tillage interventions, whilst for achieving higher yield of soybean seed intensive tillage is recommended.

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