scholarly journals Effect of Weed Control Treatments and Planting Density in Maize (Zea mays L.)

2016 ◽  
Vol 38 (1) ◽  
pp. 55-77
1983 ◽  
Vol 63 (1) ◽  
pp. 235-241 ◽  
Author(s):  
J. A. IVANY ◽  
J. R. ENMAN

Forage corn (Zea mays L.) was grown successfully in Prince Edward Island by no-till planting the corn into standing cereal stubble 15–20 cm tall using a Buffalo no-till seeder. Planting with the slot-type shoe in a preliminary experiment in 1978 gave better forage yields than planting with a slice-type shoe mainly because of better plant population achieved. Subsequent experiments in 1979–1981 using the slot-type shoe to no-till plant corn in cereal stubble gave good forage yields when adequate weed control was provided with herbicide treatment. Best control of quackgrass (Agropyron repens L. Beauv.) and dandelion (Taraxacum officinale Weber) and crop yields was achieved with glyphosate + atrazine (1.5 + 2.5 kg a.i./ha) or amitrole + atrazine (3.4 + 2.5 kg a.i./ha) applied preemergence after seeding corn and before corn emergence. Control of quack grass and dandelion with glyphosate or amitrole used alone ranged from 71–80%, but paraquat alone did not provide any weed control. Addition of atrazine to paraquat, glyphosate, or amitrole gave improved control of quackgrass and dandelion and higher forage corn yields. Addition of 2.5 kg a.i./ha atrazine gave better results than use of 1.0 kg a.i./ha of atrazine.Key words: Forage corn, no-till seeding, glyphosate, atrazine, aminotriazole, paraquat


2008 ◽  
Vol 27 (3-5) ◽  
pp. 452-458 ◽  
Author(s):  
Robert E. Nurse ◽  
Allan S. Hamill ◽  
James J. Kells ◽  
Peter H. Sikkema
Keyword(s):  
Zea Mays ◽  

2017 ◽  
Vol 16 (3) ◽  
pp. 556
Author(s):  
ARIANA VIEIRA SILVA ◽  
LUCAS EDUARDO DE OLIVEIRA APARECIDO ◽  
FILIPPE CARNEIRO LOPES ◽  
OTAVIO DUARTE GIUNTI

RESUMO – O objetivo deste trabalho foi avaliar o controle de plantas daninhas no cultivo do milho silagem em diferentes espaçamentos entre linhas. Ele foi desenvolvido em Muzambinho-MG (Brasil), no ano agrícola de 2010/2011. Empregou-se o delineamento experimental em blocos casualizados e esquema fatorial 3x4, sendo utilizados três espaçamentos entre linhas (0,50 m; 0,75 m; 1,00 m) e quatro métodos de controle das plantas daninhas (testemunha “capina”; herbicida aplicado em pré-emergência das plantas daninhas; herbicida aplicado em pós-emergência das plantas daninhas; e herbicidas aplicados em pré-emergência e pós-emergência das plantas daninhas), com três repetições, totalizando 36 parcelas experimentais. Nas avaliações, além dos parâmetros fitotécnicos, como altura de plantas e espiga, diâmetros de colmo, produtividade, estande final, também foram avaliados paramentos físicos, químicos e biológicos da silagem, como a umidade a 65 °C e 105 °C, fibra bruta, proteína bruta, matéria mineral, extrato etéreo e fibra em detergente ácido e neutro. Houve interação significativa entre os manejos de plantas daninhas e os espaçamentos entre linhas, para as variáveis: estande final, produtividade, umidade a 65 °C, fibra bruta, e fibra em detergente ácido. A mudança no espaçamento entre linhas e na densidade de plantio afeta diretamente o manejo de plantas daninhas no cultivo de milho para silagem.Palavras-chave: herbicidas, controle químico, Zea mays, biplot. WEED CONTROL IN MAIZE SILAGE IN DIFFERENT SPACINGS  ABSTRACT - This study aimed to evaluate the corn silage weed control in different row spacings. The work was developed in Muzambinho, State of Minas Gerais (Brazil), in the agricultural year 2010/2011. The experimental design was carried out with randomized block (RBD) in 3x4 factorial scheme with three row spacings (0.50 m, 0.75 m and 1.00 m) and four methods of weed control (witness “hoeing”; herbicide pre-emergent; herbicide-post emergent; and herbicide pre-emergent and post-emergent), and three replications. Plant height and ear insertion, stem diameter, yield and final stand, silage physical, chemical and biological parameters, such as humidity at 65 °C and 105 °C, raw fiber, raw protein, ash, ether extract and fiber in acid and neutral detergent, were evaluated. The interaction between weed management systems and spacings was significant for stand, yield, humidity at 65 °C, raw fiber, ether extract and acid detergent fiber. The change in line spacing and planting density directly affects weed management in silage corn cultivation. Keywords: herbicide, chemical control, Zea mays, biplot.


1983 ◽  
Vol 63 (1) ◽  
pp. 227-234 ◽  
Author(s):  
J. R. MOYER ◽  
R. D. DRYDEN ◽  
P. N. P. CHOW

EPTC and the antidotes, R25788 (N, N-diallyldichloroacetamide) and R29148 (2, 2, 5-trimethyl-3-dichloroacetyl oxazolidine) were applied to field plots of corn (Zea mays L.) in the fall or spring from the fall of 1975 to the spring of 1978. Soil samples were taken from selected treatments in the fall of 1977 and spring of 1978. Residues of EPTC, R25788, and R29148 were measured by gas liquid chromatography. Much better weed control and higher corn yields were obtained with spring applications than with fall applications. EPTC at the highest rate of 13.4 kg/ha, without the antidotes, did not injure corn. Over 95% of the EPTC present in the soil on 24 Oct. 1977 had disappeared by 30 May 1978. Levels of EPTC on 30 May 1978 were appreciably higher following spring application. Neither R25788 nor R29148 disappeared faster than EPTC from the surface layer of soil.Key words: EPTC, R25788, R29148, soil residues, corn


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