Fenologia do coqueiro anão verde em região semiárida

Câmara, Francisco Mickael Medeiros; Alves, Anderson Araujo; Celedônio, Wilma Freitas; Oliveira, Luana Mendes; Pereira, Gustavo Alves; Mendonça, Vander

doi:10.30969/acsa.v14i4.1012

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…3) constitutes a good vegetative aspect of coconut trees, besides being above the values found in the literature, once, according to Castro et al (2009), when environmental conditions favor the canopy development, the coconut tree may reach between 25 and 30 leaves, and the authors observed between 18 and 27 live leaves. Ferreira Neto et al ( 2007) and Câmara et al (2019) in studies with coconut trees in the Northeast region accounted for an average of 22.25 and 22.28 leaves, respectively.…”

Section: Discussionmentioning

confidence: 96%

“…Under water deficit, the coconut palm reduces the growth and the number of flowers (Silva et al 2017). Also, a decrease in the fruit size, as well as the abortion of fruits, may happen, which results in low yield (Araújo et al 2022, Câmara et al 2019). Thus, irrigation has been used as management practice to minimize these effects and allow the expansion of its cultivation in regions with seasonal water deficit (Santos et al 2020) when water demand is not met by rain events.…”

Section: Introductionmentioning

confidence: 99%

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Net radiation partitioning, evapotranspiration, and crop coefficients of the green dwarf coconut in Santa Izabel do Pará, Brazilian Amazon

Carvalho,

Fernandes,

Rua

et al. 2024

Bragantia

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Inadequate management of the irrigation system has compromised yield and favoured the degradation and waste of water resources. To ensure efficient irrigation management, providing yield increases, sustainability in the use of water resources and reduction of production costs, studies about the water demand of coconut palms are needed. The objective of this study was to determine the energy partition, crop evapotranspiration (ET c ), and the simple crop coefficients (K c ) of the green dwarf coconut palms in Santa Izabel do Pará, Pará, Brazil. The experiment was carried out in a coconut plantation at Reunidas Sococo Farm, with an area of approximately 7 ha in a triangular spacing of 7.5 × 7.5 m, during 2020 and 2021. The ETc was determined by the Bowen ratio method, with measurements of temperature and relative humidity at two levels above the crop canopy and reference evapotranspiration (ET o ) by the FAO Penman-Monteith method, using data from the National Institute of Meteorology. The K c was determined by the ratio between ETc and ETo. The total water demand of the coconut palm was 489 (2020) and 480 mm (2021), with a daily average of 4.21 (2020) and 4.14 mm (2021) for the dry season. The mean value of K c was 1.06 (± 0.12). Evapotranspiration was driven mainly by energy availability, associated with a control of atmospheric demand on K c values, suggesting a possible influence of coconut trees on Kc values even under good water availability and small variability in vegetation cover.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Net radiation partitioning, evapotranspiration, and crop coefficients of the green dwarf coconut in Santa Izabel do Pará, Brazilian Amazon

Carvalho,

Fernandes,

Rua

et al. 2024

Bragantia

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show abstract

“…Other, equally important, factors involve vegetative and reproductive aspects, such as the age of the coconut palm trees and climatic conditions, particularly in semi-arid regions where there is an uneven distribution of rainfall, leading to the atrophy of bunches of fruits in dry periods (CÂMARA et al, 2019). In established plantations, the accumulation of residual organic matter from coconut palm trees, and other organic residues may signifi cantly affect the rhizospheric soil microbiota (MALHOTRA et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Chemical and microbiological attributes of sandy soil fertilized with crushed green coconut shell

Paiva

Taniguchi

Romero

et al. 2022

Revista Ciência Agronômica

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The objective of this work was to evaluate the chemical composition of crushed green coconut shell and its effects on soil attributes. The treatments consisted of areas that received the residue and presented differences in the reaction time with the soil: 1 (T1); 12 (T2); 36 (T3) and 72 months (T4) and another area, in which the residue was not applied (T5). Samples of residues remaining on the soil surface were collected to evaluate the chemical composition and soils for chemical analysis, microbial activity, and arbuscular mycorrhizal fungi. Nutrients and sodium concentrations remained the same over time, providing, in order of magnitude, the contribution of organic C > K > N > Ca > Mg > Na > P > S > Fe > Mn > Zn > Cu to the soil. Over the periods evaluated, there were increases in the availability of elements, such as N, P, K and Na, and increases in the sum of base and cation exchange capacity of the soil. During the treatment with the longest period evaluated, there were increases in microbial biomass activity, measured by edaphic respiration and by metabolic and mineralization quotients. As time progressed, there were variations in communities of arbuscular mycorrhizal fungi, but this did not affect the diversity of fungal species. The most prevalent spore morphotypes belonged to Acaulospora laevis, A. scrobiculata and Claroideoglomus etunicatum. The application of 100 t ha -1 of crushed green coconut shell promotes changes in the chemical and microbiological soil attributes, especially in the fi rst months of the application of the residue. Reapplying residue 36 months after the fi rst application is recommended.

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Evaluation of the critical points of the most adequate nonlinear model in adjusting growth data of ‘green dwarf’ coconut fruits

et al. 2021

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‘Green Dwarf’ coconut is a fruit of great economic interest, since all its components are used, in addition to water, its main component. It is a culture of humid tropics, widely produced in northeastern Brazil, being an important income source for the region. The phenology study of this type of fruit is extremely important, but there are few studies in literature. Regression models, especially nonlinear growth models, can be of great value to understand how fruit growth behaves. The scarcity of works of this nature may be linked to some difficulties in estimating parameters of nonlinear models, such as assigning initial values to the itterative process. Overcoming this difficulty, for regression analysis, linear or not, several steps need to be respected to ensure the validity of information. Much information can be extracted from nonlinear growth models, such as the asynotic value, growth rate and critical points (maximum acceleration point, inflection point, maximum deceleration point and asynotic deceleration point). The aim of this work was to describe the stages of nonlinear regression analysis and to estimate the critical points of ‘Green Dwarf ’ coconut growth curves. After initial adjustments, the only unmet assumption was independence, adding a first order autoregressive term. Again, models were adjusted and all parameters were significant, with both models, Gompertz and Logistic, adjusting well to data, with slight advantage for the Logistic model with better adjustment quality criteria values, with maximum expected LED and LEDKP values of 21.4037 cm and 21.5478 cm, respectively. The x and y axis of critical points were estimated, with values that can help producers to make more objective decisions about the appropriate time to harvest coconut fruits, considering the most diverse uses of this type of fruit.

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Fenologia do coqueiro anão verde em região semiárida

Cited by 5 publications

References 9 publications

Net radiation partitioning, evapotranspiration, and crop coefficients of the green dwarf coconut in Santa Izabel do Pará, Brazilian Amazon

Net radiation partitioning, evapotranspiration, and crop coefficients of the green dwarf coconut in Santa Izabel do Pará, Brazilian Amazon

Chemical and microbiological attributes of sandy soil fertilized with crushed green coconut shell

Evaluation of the critical points of the most adequate nonlinear model in adjusting growth data of ‘green dwarf’ coconut fruits

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