Numerical modeling of actual evapotranspiration of a coffee crop

Cesanelli, Andrés; Guarracino, Luis

doi:10.1590/s0103-90162011000400001

Cited by 5 publications

(2 citation statements)

References 22 publications

(33 reference statements)

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“…Coffee plants most likely did not differ in transpiration, as the environmental conditions were identical and as the differences in plant development were too small. This is indicated by the absence of any treatment effects on leaf area, which is usually correlated to WUE and transpiration ( Cesanelli and Guarracino , ). The significantly lower WUE values must have been caused by a reduced evaporation, so that less water was necessary to produce the same amount of plant biomass than without mucilage.…”

Section: Discussionmentioning

confidence: 99%

Coffee mucilage impact on young coffee seedlings and soil microorganisms

Castaño

Jannoura

Joergensen

2019

J. Plant Nutr. Soil Sci.

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A greenhouse pot experiment was carried out to assess the effects of fermented coffee mucilage applied as mulch together with maize leaves on the growth of young coffee plants of two different varieties and on soil microbial biomass indices. The coffee variety Catuai required 32% more water per g plant biomass than the variety Yellow Caturra, but had a 49% lower leaf area, 34% less shoot and 46% less root biomass. Maize and mucilage amendments did not affect leaf area, shoot and root yield, or the N concentration in shoot and root dry matter. The amendments always reduced the water use efficiency values, but this reduction was only significant in the maize+mucilage‐14 (= 14 g mucilage pot−1) treatment. Soil pH significantly increased from 4.30 in the control to 4.63 in the maize+mucilage‐14 treatment. Microbial biomass C increased by 18.5 µg g−1 soil, microbial biomass N by 3.1 µg g−1 soil, and ergosterol by 0.21 µg g−1 soil per g mucilage added pot−1. The presence of mucilage significantly reduced the microbial biomass‐C/N ratio from a mean of 13.4 in the control and maize treatments to 9.3, without addition rate and coffee variety effects. The application of non‐composted mucilage is recommended in areas where drought leads to economic losses and in coffee plantations on low fertility soils like Oxisols, where Al toxicity is a major constraint.

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Section: Discussionmentioning

confidence: 99%

Coffee mucilage impact on young coffee seedlings and soil microorganisms

Castaño

Jannoura

Joergensen

2019

J. Plant Nutr. Soil Sci.

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“…Coffee plants were cultivated under rainfed (not irrigated – NI) and with additional irrigation (irrigated – IR). For this latter treatment, drip irrigation was implemented, being triggered based on soil water balance method and aiming to restore the soil water field capacity (Cesanelli and Guarracino, 2011). The irrigation flow rate of each dripper was 3.5 L h −1 .…”

Section: Methodsmentioning

confidence: 99%

Drought responses in Coffea arabica as affected by genotype and phenophase. I – leaf distribution and branching

Rakocevic,

Matsunaga,

Pazianotto

et al. 2024

Ex. Agric.

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Summary In Coffea arabica, there is a small genetic distance between wild and bred genotypes. However, coffee genotypes express differential acclimation to multiple drought cycles, allowing them to successfully deal with water-limiting conditions. We hypothesized that bred coffee cultivars have a plant structure less sensitive to drought than wild genotypes. Plant and leaf architecture were analyzed over the coffee strata of two cultivars (Iapar 59 and Catuaí 99) and two wild Ethiopia accessions (‘E083’ and ‘E027’) grown under rainfed conditions and irrigation. During two consecutive productive years, evaluations were taken at leaf and berry expansion (BE1 and BE2) and harvest (BH1 and BH2) phenophases. The plant canopy was divided into up to four strata of 40 cm of thickness. Topological and geometric coding of coffee trees was performed in three botanical scales – metamers, branches, and plants in multiscale tree graphs (MTGs), following the VPlants modeling platform. Leaf and branch area per plant increased with tree structure development, being always significantly higher in irrigated than in rainfed plants over all phenophases. The individual leaf area was the least sensitive to water regime in Catuaí 99, while the 2nd order axis elevation – angle in relation to horizontal plane, ranging from 0° to 90° – of bred cultivars was less sensitive to drought than in ‘E083’. This finding partially corroborated our hypothesis that orchestrated reprograming of leaf/branch responses over the vertical plant profile were less sensitive to water availability in cultivars than in wild accessions. Leaves of 2nd to 4th-order branching were roughly plagiophile, while the 1st-order leaves were classified as extremophiles. When the coffee leaves were planophile, irrespective of genotype, this pattern was found at the lowest, 1st plant stratum, and the newest developed 4th stratum. Such responses were not obligatorily related to water regime, similar to branch elevation – with exception of ‘E083’, very sensitive to drought. Taken together, our data suggest that the leaf and branch elevations in C. arabica were more influenced by light distribution through the canopy profile – i.e., self-shading – than by water availability.

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