&lt;b&gt;Efficiency of the leaf disc method for estimating the leaf area index of soybean plants&lt;/b&gt; - doi: 10.4025/actasciagron.v35i4.16290

Pierozan, Clovis; Kawakami, Jackson

doi:10.4025/actasciagron.v35i4.16290

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Lugg and Sinclair (1979) reported that soybean SLA increased until the R1 stage and then decreased steadily until mid-pod-fill (R5 to R6), but also varied among soybean cultivars. The SLA values calculated for soybean in this study are within the range reported in the literature (Junior and Kawakami 2013;Lugg and Sinclair 1979;Patterson and Flint 1983;Thompson et al 1995). Soybean did not compensate for interplant competition by altering its biomass partitioning or adjusting its SLA (i.e., leaf thickness), indicating that these are not ways in which soybean adjusts for interplant competition for light.…”

Section: Specific Leaf Areasupporting

confidence: 78%

Soybean and common ragweed (Ambrosia artemisiifolia) growth in monoculture and mixture

Barnes

Jhala

Knežević³

et al. 2019

Weed Technol

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Understanding how plants alter their growth in response to interplant competition is an overlooked but complex problem. Previous studies have characterized the effect of light and water stress on soybean or common ragweed growth in monoculture, but no study has characterized soybean and common ragweed growth in mixture. A field study was conducted in 2015 and 2016 at the University of Nebraska-Lincoln to characterize the growth response of soybean and common ragweed with different irrigation levels and intraspecific and interspecific interference. The experiment was arranged in a split-plot design with irrigation level (0, 50%, 100% replacement of simulated evapotranspiration) as the main plot and common ragweed density (0, 2, 6, 12 plants m−1 row) as the subplot. Crop- and weed-free controls and three mixture treatments were included as subplots. Periodic destructive samples of leaf area and biomass of different organ groups were collected, and leaf area index (LAI), aboveground biomass partitioning, specific leaf area (SLA), and leaf area ratio (LAR) were calculated. Additionally, soybean and common ragweed yield were harvested, and 100-seed weight and seed production were determined. Soybean did not alter biomass partitioning, SLA, or LAR in mixture with common ragweed. Soybean LAI, biomass, and seed size were affected by increasing common ragweed density. Conversely, common ragweed partitioned less new biomass to leaves and increased SLA in response to increased interference. Common ragweed LAI, biomass, and seed number were reduced by the presence of soybean and increasing common ragweed density; however, seed weight was not affected. Results show that adjustment in biomass partitioning, SLA, and LAR is not the method that soybean uses to remain plastic under competition for light. Common ragweed demonstrated plasticity in both biomass partitioning and SLA, indicating an ability to maintain productivity under intra- and inter-specific competition for light or soil resources.

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Section: Specific Leaf Areasupporting

confidence: 78%

Soybean and common ragweed (Ambrosia artemisiifolia) growth in monoculture and mixture

Barnes

Jhala

Knežević³

et al. 2019

Weed Technol

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“…Plants were harvested and randomly chosen from each sub-plot to assess wheat yield measurements by measuring the LAI by using the disc method [ 45 ] the number of grains/spike and grain weight/spike (g) by taking the average of 10 random spikes from each plot; the number of spikes m −2 by counting the spikes in a random square meter in each plot; grain yield (ton ha −1 ) by weighing the grains threshed from the plot and calculating the yield for hectare; straw yield (ton ha −1 ) as the difference between biological yield and grain yield; biological yield (ton ha −1 ) by weighing all the plants from the harvested plot; 1000 grain wt. (gm); and the harvest index (HI) by dividing the grain yield by the biological yield.…”

Section: Methodsmentioning

confidence: 99%

Assessing Soil Quality, Wheat Crop Yield, and Water Productivity under Condition of Deficit Irrigation

Emran,

Ibrahim,

Wali

et al. 2024

Plants

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Wheat is one of the most important cereal crops in Egypt and all over the world. Its productivity is adversely affected by drought due to deficient irrigation to provide nutrients required for plant growth. In a field experiment, silicon foliar applications at concentrations of 0, 200, and 400 mg L−1 were performed at different irrigation rates ranging from 1000 to 4000 m3 ha−1 to assess water irrigation productivity and wheat crop yield in a calcareous soil under arid climate conditions. Increased irrigation rates led to a significant increase in soil nutrient dynamics, as well as in the number and weight of grains per spike, leaf area index, grain yield, straw yield, and biological yield, with the exception of the weight of 1000 grains. Spraying with sodium silicate had a significant impact on grain yield and harvest index but did not significantly impact the other traits. Furthermore, the interaction between irrigation and silicate application rates showed significance only for grain yield, the number of spikes/m2, and the harvest index. Applying three times irrigation could produce the highest nutrient retention, wheat yield, and water irrigation productivity. No significance was observed between 3000 m3 ha−1 and 4000 m3 ha−1 irrigation, indicating a saving of 25% of applied irrigation water. It can be concluded that applying irrigation at 3000 m3 ha−1 could be a supplemental irrigation strategy. High wheat grain yield can be achieved under deficit irrigation (3000 m3 ha−1) on the northwestern coast of Egypt with an arid climate by spraying crops with sodium silicate at a rate of 400 mg L−1.

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“…Then, the leaf discs were dried in a laboratory tray dryer at 70 C for 48 h. Once the discs were dried, each leaf disc was weighed again to obtain its dry mass. We used the obtained values of fresh and dry mass to calculate LWC as the proportion of the disparity between leaf fresh mass and dry mass to leaf dry mass, and SLA as the ratio between leaf area and leaf dry mass (Pierozan Junior & Kawakami, 2013). Species in resource-rich environments tend to have larger SLA (Cornelissen et al, 2003); thus, we categorized LWC and SLA as leaf resource acquisition traits.…”

Section: Leaf Mechanical and Secondary Metabolites Samplingmentioning

confidence: 99%

The effect of drought‐induced leaf traits onFicusleaf palatability is species specific

Xiao,

Jorge,

Volf

et al. 2024

Ecosphere

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Drought has a significant impact on plant–insect interactions by altering plant survival, growth, leaf quality, and defense traits. Tropical plants are particularly vulnerable to water depression because of shallow root depth. In the context of climate change, drought events are expected to increase in frequency and intensity; however, their impact on tropical ecosystems remains poorly known. Insect herbivores represent the largest feeding guild of arthropods, and they devour four to five times more plant material than vertebrates do. Understanding how drought affects plant traits and leaf palatability in a keystone and ecologically diverse plant genus, such as Ficus (Moraceae), is crucial for predicting how climate change might alter tropical plant–insect interactions. We examined the impact of drought intensity and duration on the leaf nutritional quality, defensive traits, and herbivory damage by caterpillars in three tropical and one Mediterranean Ficus species in a greenhouse. We also conducted food choice trials with generalist caterpillars to evaluate the impact of drought on herbivores. Drought intensity and duration had no direct effect on leaf palatability across the Ficus species. However, drought indirectly affected leaf palatability via drought‐induced leaf traits in a species‐specific manner. Drought intensity and duration decreased leaf water content, resulting in decreased leaf palatability in F. benjamina and F. lyrata. Leaf defensive traits such as flavonoid concentration were affected by drought intensity and decreased leaf palatability in F. carica. Drought influenced the leaf traits of F. elastica, but none of them affected leaf palatability. Overall, this study establishes the link between drought and insect feeding on plants via leaf traits. The species‐specific responses to drought highlight the significance of climate‐related plant life histories in relation to climate change, underscoring the need for further investigations.

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<b>Efficiency of the leaf disc method for estimating the leaf area index of soybean plants</b> - doi: 10.4025/actasciagron.v35i4.16290

Cited by 10 publications

References 18 publications

Soybean and common ragweed (Ambrosia artemisiifolia) growth in monoculture and mixture

Soybean and common ragweed (Ambrosia artemisiifolia) growth in monoculture and mixture

Assessing Soil Quality, Wheat Crop Yield, and Water Productivity under Condition of Deficit Irrigation

The effect of drought‐induced leaf traits onFicusleaf palatability is species specific

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