Chemigation for Crop Production Management

Johnson, Alexis M.; Young, Jim; Threadgill, E. D.; Dowler, C. C.; Summer, D. R.

doi:10.1094/pd-70-998

Cited by 32 publications

(14 citation statements)

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“…Reis et al (1988), mostraram que inseticidas utilizados no controle da lagarta-do-cartucho na cultura do milho diferem em seletividade para os principais inimigos naturais dessa praga; na aplicação via irrigação, acredita-se que o impacto seja menor em relação aos métodos convencionais, devido à baixa concentração do ativo na calda. Johnson et al (1986) relataram a baixa concentração como vantagem desse método, reduzindo os riscos de intoxicação para o ser humano. Segundo os autores, a concentração de inseticida aplicado via água de irrigação é 140 a 1000 vezes menor do que em aplicação por avião, e de 27 a 200 vezes menor do que em aplicação com pulverizadores tratorizados convencionais.…”

Section: Resultsunclassified

Controle da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith) (Lepidoptera:Noctuidae) na cultura do milho com inseticidas aplicados via irrigação por aspersão

Viana

Costa

1998

An. Soc. Entomol. Bras.

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-Studies were conducted during [1988][1989][1990][1991][1992][1993][1994] to compare the effectiveness of application of various insecticides through a sprinkler irrigation system for the control of the fall armyworm, Spodoptera frugiperda (J. E. Smith), infesting corn (Zea mays L.). The treated plots were artificially infested during the whorl stage with 10 newly-hatched larvae/plant 2 d before insecticide application. The effectiveness of the insecticides were determined couting the number of live larvae/50 plants selected at random, three, 10 or 15 d after insecticide application. Chlorpyrifos (288.0 g i.a./ha) provided the most consistent control of fall armyworm larvae (82.9-98.7% effectiveness) followed by carbaryl (1105.0 g i.a./ha)(84.0%), diazinon (480.0 g i.a./ha) (83.4%), lambdacyalothrin (10.0 g i.a./ha) (81.3%), triflumuron (2.5 g i.a./ha) (79.9%) and diflubenzuron (50.0 g i.a./ha) (73.3%).

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Section: Resultsunclassified

Controle da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith) (Lepidoptera:Noctuidae) na cultura do milho com inseticidas aplicados via irrigação por aspersão

Viana

Costa

1998

An. Soc. Entomol. Bras.

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“…This technique, called chemigation, is widely used in sprinkler irrigation and drip irrigation systems (Johnson et al, 1986). The fertirrigation system needs an injector.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation to the Flow Field of Venturi Injector

Huang

Miao

2009

IFIP Advances in Information and Communication Technology

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Abstract:Venturi injector is widely used in fertigation system due to its obvious advantages such as cheap and robust system without mobile pieces, simple structure, convenient to operation, stable performance, needless of external energy for operation etc. At present, the hydraulic parameters such as suction capacity (injection rate) for the most of the Venturi injectors produced domestically are not very desirable. In this paper, CFD (Computational Fluid Dynamics) method was used to simulate the inner flow field of the Venturi injectors, and the relationships among the structure parameters (i.e., throat length L, throat diameter D, slot diameter Da) and suction capacity q, and the optimal structure sizes of the Venturi injector were analyzed. The results show that when the inlet pressure and the slot position are kept unchanged as the sample one, the suction capacity of Venturi injector increases with the decrease of throat diameter D and throat length L, and the increase of slot diameter Da; while keeping the slot diameter Da, throat diameter D and throat length L unchanged, the suction capacity of Venturi injector q increases with the increase of inlet pressure P. The optimal combination of the structural parameters in this size was selected as follows: throat diameter D=8mm, slot diameter Da=18.5mm, and throat length L=14mm. In this case, the suction capacity of the Venturi injector q=1.203m3/h. The results can provide theoretic support for domestic Venturi injector research, design and manufacturing.

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“…Chemigation wets the entire leaf surface and residues may be displaced from the tissues due to the cuticle (Neely, 1970;Neely, 1971;Skoss, 1955). Johnson et al (1986) found that only 10% of chlorothalonil applied was retained on the foliage after chemigation. Backman (1982) speculated that the displacement of PCNB and carboxin due to chemigation led to improved efficacy of stem rot in Alabama.…”

Section: Improving Fungicide Deposition and Efficacy Via Application mentioning

confidence: 99%

Chemical Control of Peanut Diseases: Targeting Leaves, Stems, Roots, and Pods with Foliar-Applied Fungicides

Woodward¹,

Kemerait²

2013

Fungicides - Showcases of Integrated Plant Disease Management From Around the World

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Chemigation for Crop Production Management

Cited by 32 publications

References 0 publications

Controle da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith) (Lepidoptera:Noctuidae) na cultura do milho com inseticidas aplicados via irrigação por aspersão

Controle da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith) (Lepidoptera:Noctuidae) na cultura do milho com inseticidas aplicados via irrigação por aspersão

CFD Simulation to the Flow Field of Venturi Injector

Chemical Control of Peanut Diseases: Targeting Leaves, Stems, Roots, and Pods with Foliar-Applied Fungicides

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