Avaliação da deposição da calda de pulverização em função da vazão e do tipo de bico hidráulico na cultura da soja

Contiero, Robinson Luiz; Macedo, Eurides Küster; Guimarães, Vandeir Francisco

doi:10.4025/actasciagron.v30i2.1789

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…According to Weber et al (2017), the deposition of chemicals in the middle and lower strata of the leaf canopy of plants is lower compared to deposition in the upper stratum. Most of the product applied in spraying, whether in high or low volume, is retained in the upper layer, with approximately ten times more coverage in the upper layer than in the lower layer (Boschini et al 2008;Barbosa et al, 2009). This information reinforces the feasibility of controlling the stink bugs when they are concentrated in the upper part of the soybean plants, between 11 am and 2 pm, as long as there is have adequate temperature and relative humidity conditions for spraying.…”

Section: Discussionsupporting

confidence: 54%

Vertical Distribution of Euschistus heros in the Leaf Canopy of Soybean Plants

Silva¹,

Vieira²,

Vieira³

et al. 2021

JAS

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The occurrence of phytophagous stink bugs in soybeans can result in production losses, if this pest is not properly controlled. Our objective was to study the vertical distribution (intra-plant) of nymphs and adults of Euschistus heros (Fabricius, 1798) (Hemiptera: Pentatomidae) in the leaf canopy of soybean plants, during the day. For this, fourteen soybean plants located in one meter of row were evaluated in the field, every three hours between 5 am and 8 pm. The sampled plants were divided into three strata (upper, middle, and lower), where nymphs and adults observed were counted in each stratum and sampling period. The treatments consisted of the three strata of the soybean plants and the different sampling points performed at each time of the day represented the repetitions. An irregular distribution of E. heros nymphs and adults was observed in the three studied strata of soybean plants, during the day. At 11 am and 2 pm, when the ambient temperature and solar radiation were highest, both the E. heros adults and the nymphs positioned preferentially on the upper stratum of the soybean plants and later migrated to the middle and lower strata when the temperature and solar radiation decreased. This information about the distribution pattern of E. heros in the soybean leaf canopy, during the day, provides knowledge for more effective monitoring and control of this pest in soybean crop.

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Section: Discussionsupporting

confidence: 54%

Vertical Distribution of Euschistus heros in the Leaf Canopy of Soybean Plants

Silva¹,

Vieira²,

Vieira³

et al. 2021

JAS

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“…Asian soybean rust, surface spraying may not be efficient, thereby compromising crop development. Similarly, Boschini et al (2008) asserted a significantly lower spray deposition on the lower third of soybeans cultivar CD 202 when compared to the upper third, regardless of nozzle or flow rate used. Given the direct relationship between depositions in the lower and upper parts, each treatment could be analyzed regarding its spray penetration through leaf mass.…”

Section: Resultsmentioning

confidence: 93%

Fungicide spray coverage and deposition in soybean asian rust management

et al. 2019

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At maximum vegetative growth, sprays with fungicide to control Asian rust (Phakopsora pachyrhizi Sydow and P. Sydow) should reach high canopy penetration and plant coverage. Therefore, the central objective of this study was to determine leaf area, spray deposition, and plant coverage by fungicides sprayed on soybeans as a function of sowing seasons and plant population densities with reduced doses of tebuconazole and azoxystrobin + cyproconazole. Field experiments were conducted in the 2009/2010 and 2010/2011 crop years, using a medium-cycle soybean cultivar MG/BR–46 (Conquista) under a natural infestation of Asian soybean rust. Leaf area (LA) and leaf area index (LAI) were measured at three developmental stages (V8, R2, and R4). Spray deposition and coverage were evaluated during the first fungicide spraying. As results, LAI decreased as plant population decreased. Despite the lower LAIs, smaller plant populations had no effect on spray deposition and plant coverage. Both fungicides presented similar depositions on all thirds when plants had lower development.

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“…Due to change in plant architecture resulting from lactofen, the lower layer of plants received a greater amount of solar radiation, making them photosynthetically more efficient. Plants with greater photosynthetic efficiency, especially in the grainfilling period, are more productive and tend to express their productive potential more easily (26). The greater interception of solar radiation via the change in architecture generally led to increased productivity (3).…”

Section: Resultsmentioning

confidence: 99%

Grain productive efficiency of soybean plants under lactofen application

2020

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Adverse factors cause a decrease in the productive potential of crops. For soybean [(Glycine max (L.) Merrill], the excessive growth is a factor that results in plants with low effective efficiency. Thus, plants with an architecture that favours greater interception of solar radiation and deposition of pesticides tend to be more productive. The objective of this study is to evaluate the different application of lactofen, which is used as a growth inhibitor, improve the productive efficiency of soybeans by increasing the biological activity of the leaves. The study was conducted in the field with soybean cultivars NA 5909 RG and BMX Potência RR. The experiment followed a randomized complete block design with four treatments and five replicates: T1: control; T2: application of 140 g a.i ha-1 of lactofen in phenological stage V3; T3: application of 140 g a.i ha-1 of lactofen in phenological stage V6; and T4: application of 70 g a.i ha-1 of lactofen in phenological stage V3 + 70 g a.i ha-1 of lactofen in phenological stage V6. The interception of photosynthetically active radiation in the lower layer increased in all treatments. Lactofen application increased the percent area covered and the number of phytosanitary products spray droplets per cm² in the middle and lower layers of the plants. The lower third of the plants experienced the greatest effect of the treatments with regard to the number of pods, grains and grain weight, with treatment T2 presenting significant increases. The use of lactofen as a growth inhibitor at the beginning of pod development in soybean caused changes to plant architecture and root development, consequently enhanced the productive efficiency of the plant, primarily due to increased grain production in the lower layer. Future research using lactofen in different phenological stages and cultivars may provide more insights in to the performance of this growth inhibitor in soybean.

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Avaliação da deposição da calda de pulverização em função da vazão e do tipo de bico hidráulico na cultura da soja

Cited by 9 publications

References 3 publications

Vertical Distribution of Euschistus heros in the Leaf Canopy of Soybean Plants

Vertical Distribution of Euschistus heros in the Leaf Canopy of Soybean Plants

Fungicide spray coverage and deposition in soybean asian rust management

Grain productive efficiency of soybean plants under lactofen application

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