scholarly journals THERMAL TIME FOR REPRODUCTIVE PHENOLOGICAL STAGES OF PINEAPPLE GUAVA (Acca sellowiana (O. Berg) Burret)

2014 ◽  
Vol 20 (1) ◽  
pp. 163-173 ◽  
Author(s):  
Alfonso PARRA-CORONADO ◽  
Gerhard FISCHER ◽  
Bernardo CHAVES-CORDOBA
Keyword(s):  
Thermal Time ◽  
Phenological Stages ◽  
Pineapple Guava ◽  
Acca Sellowiana

scholarly journals Phenological behavior of feijoa accessions in their main diversity center

2020 ◽  
Vol 55 ◽  
Author(s):  
Fernando David Sánchez-Mora ◽  
Luciano Saifert ◽  
Marlise Nara Ciotta ◽  
Humberto Nunes Ribeiro ◽  
Luciane Isabel Malinovski ◽  
...  
Keyword(s):  
Fruit Ripening ◽  
Thermal Time ◽  
Growing Degree Days ◽  
Base Temperature ◽  
Degree Days ◽  
Germplasm Bank ◽  
Phenological Stages ◽  
Santa Catarina ◽  
Time Requirements ◽  
Acca Sellowiana

Abstract: The objective of this work was to identify the minimum base temperature (Tb) and the maximum base temperature (TB) to predict the thermal time for six phenological stages of feijoa (Acca sellowiana) accessions. During ten noncontinuous harvests (2004 to 2017), 247 feijoa accessions, maintained in the Feijoa Active Germplasm Bank, in São Joaquim, in the state of Santa Catarina, Brazil, had their data recorded for: initial sprouting (IS), initial flowering (IF), end of flowering (EF), beginning of harvest (BH), and end of harvest (EH). Tb and TB were estimated by the Arnold’s method of least variability, and the TT requirements were obtained by Ometto’s method. Tb at 7.76°C and TB at 17.0°C were necessary when feijoa plants started growing (IS stage) just after winter; and Tb at 10.6°C and TB at 19.5°C were the calculated values from IS until BH. The budding stage of the accessions began in the mid-September (50.6%); flowering occurred predominantly in November (90%); and harvest began in March and lasted until May. About 176 days, with 1,014.4 growing degree-days, are necessary to complete the productive cycle from IS until BH. The early, intermediary, and late fruit-ripening accessions show different thermal time requirements.

scholarly journals Model of pre-harvest quality of pineapple guava fruits (Acca sellowiana (O. berg) burret) as a function of weather conditions of the crops

Bragantia ◽  
2017 ◽  
Vol 76 (1) ◽  
pp. 177-186 ◽  
Author(s):  
Alfonso Parra-Coronado ◽  
Gerhard Fischer ◽  
Jesús Hernán Camacho-Tamayo
Keyword(s):  
Weather Conditions ◽  
Pineapple Guava ◽  
Acca Sellowiana

scholarly journals Physicochemical characterization and nutritional composition analysis of pineapple guava at three different ripening stages

2016 ◽  
Vol 34 (2) ◽  
pp. 217-227 ◽  
Author(s):  
Lina María García-Rivera ◽  
Henry Alexander Váquiro-Herrera ◽  
José Fernando Solanilla-Duque
Keyword(s):  
Vitamin A ◽  
Physicochemical Characterization ◽  
Chemical Characterization ◽  
Nutritional Composition ◽  
Neutral Detergent Fiber ◽  
Composition Analysis ◽  
Current Consumption ◽  
Total Carbohydrates ◽  
Pineapple Guava ◽  
Acca Sellowiana

Pineapple guava (Acca sellowiana [O. Berg] Burret) is a fruit with export and production potential in Colombia. However, there are few reports about its composition concerning physiological behavior throughout the different ripening phases. Intending to confront this situation, a study was proposed in order to evaluate the physicochemical properties and the nutritional composition of pineapple guava fruits in three different phases of ripening, determined by the weeks elapsed after anthesis, considering it undeveloped for week 17 (W17), ripe for week 20 (W20) and overripe from week 21 (W21). Pineapple guava fruits were preliminarily characterized, they underwent a bromatological analysis and their content of vitamin A and C content was established. The results showed a significant content of crude fiber and total carbohydrates in the three evaluated phases. There was also a decrease in the neutral detergent fiber of 38% between W17 and W21. The highest level of vitamin C was reported in W17 (67.82 mg ascorbic acid/g dry sample), as well as for vitamin A (12.65 mg β-carotene/g dry sample). In a physical-chemical characterization, the existence of a particular physiological behavior is possible because of the development in size and mass of the fruit after physiological ripening. Additionally, the calcium and reducing carbohydrate content can be associated with the pulp browning phenomenon. Clearly, pineapple guava is a promising fruit thanks to its nutritional properties, according to the current consumption tendencies.

scholarly journals Variation of Thermal Time, Phyllochron and Plastochron in Passion Fruit Plants With Irrigation Depth and Hydrogel

2018 ◽  
Vol 10 (5) ◽  
pp. 229
Author(s):  
Adailza G. Cavalcante ◽  
Lourival F. Cavalcante ◽  
Alian C. P. Cavalcante ◽  
Antônio G. de L. Souto ◽  
Carlos E. M. dos Santos ◽  
...  
Keyword(s):  
Arid Regions ◽  
Passion Fruit ◽  
Main Stem ◽  
Thermal Time ◽  
Phenological Stages ◽  
Thermal Requirements ◽  
Production Water ◽  
Whole Plant ◽  
Irrigation Depth ◽  
Phenological Phases

The passion fruit demands water for its growth and production. Water management is relevant in regions characterized by low rainfall indices, such as semi-arid regions. In this direction, the use of hydrogel in the soil allows the water that is supplied through irrigation to be better utilized by the plants, reducing leach losses. The objective of this experiment was to evaluate the influence of hydrogel in soil cultivated with passion fruit and irrigated to various water depths on the thermal time of the phenological stages, phyllochron and plastochron of the plants. Treatments were distributed in randomized blocks in a 2 × 5 factorial arrangement, referring to the soil without and with hydrogel and raising the irrigation depth from 60% to 70%, 80%, 90% and 100% of crop evapotranspiration in four replications. The thermal requirements of the phenological phases and of the whole plant cycle, phyllochron of the main stem and the productive branches, and plastochron were evaluated. Increasing the irrigation depth from 60% to 100% reduced the total thermal time values from 3,811.8 to 2,401.3 °C day and from 3,707.8 to 2,628.7 °C day in the soil without and with hydrogel, respectively. The thermal time of the phenological phases and the phyllochron of the main stem and productive branches of the passion fruit were stimulated by an increase in irrigation depth.

scholarly journals Growth model of the pineapple guava fruit as a function of thermal time and altitude

2016 ◽  
Vol 36 (3) ◽  
pp. 6 ◽  
Author(s):  
Alfonso Parra-Coronado ◽  
Gerhard Fischer ◽  
Gerhard Fischer ◽  
Jesus Hernan Camacho-Tamayo ◽  
Jesus Hernan Camacho-Tamayo
Keyword(s):  
Regression Analysis ◽  
San Francisco ◽  
Growth Model ◽  
Cross Validation ◽  
Thermal Time ◽  
Logistic Growth ◽  
Guava Fruit ◽  
Pineapple Guava ◽  
Production Area ◽  
Logistic Growth Model

The growth of the pineapple guava fruit is primarily stimulated by temperature but is also influenced by other climactic factors, such as altitude. The goal of this study was to develop a growth model for the pineapple guava fruit as a function of thermal time (GDD, growing-degree day) and altitude (H) of the production area. Twenty trees per farm were marked in two sites in the Cundinamarca department (Colombia) during the 2012 and 2014 seasons. The measurements were performed every seven days after day 96 and 99 post-anthesis until harvest in the sites of Tenjo (2,580 m.a.s.l.) and San Francisco de Sales (1,800 m.a.s.l.), respectively. A growth model was produced for weight as a function of fruit length and diameter as well as for the weight of the fruit as a function of GDD and H, with this last measure adjusted to a sigmoidal logistic growth model. The parameters for the regression analysis showed that the models satisfactorily predicted fruit growth for both of the sites, with a high determination coefficient. The cross-validation showed good statistical fit between the predicted and observed models; the intercept was not significantly different than zero, and the slope was statistically equal to one.

scholarly journals Estimated length of soybean phenological stages

2016 ◽  
Vol 37 (4) ◽  
pp. 1871 ◽  
Author(s):  
Ana Paula Rockenbach ◽  
Braulio Otomar Caron ◽  
Velci Queiróz de Souza ◽  
Elvis Felipe Elli ◽  
Douglas Machado de Oliveira ◽  
...  
Keyword(s):  
Meteorological Parameters ◽  
Thermal Time ◽  
Maximum Temperature ◽  
Temperature Minimum ◽  
Full Bloom ◽  
Phenological Stages ◽  
Potential Yield ◽  
Average Temperature ◽  
Growth Habits ◽  
Santa Maria

The use of modeling is a trend for agronomic science that aims to detect factors that could limit the growing practices and influence the potential yield of some crops. The objective of this study was to calculate the accumulated thermal time and estimate the phenological stages length of three soybean cultivars in two crop years, using agronomic models associated to meteorological variables. Two experiments were conducted in a field at the Agroclimatology Laboratory (LAGRO) of the Federal University of Santa Maria/UFSM, campus of Frederico Westphalen/RS, Brazil during the 2012/2013 and 2013/2014 crop years. A randomized block in a factorial scheme 6x3 with six spatial arrangements (45, crossed, 20, 20x40, 20x60 and 20x80 cm) and three cultivars with different cycles and growth habits (BMX Ativa RR/determinate, BMX Turbo RR/indeterminate and BMX Potência RR/indeterminate) with three replications were used for the experimental design. Sowing was held on 11/28/2012 and 12/02/2013. The assessed phenological stages were sowing-emergence; emergence – final vegetative; final vegetative – full bloom; full bloom – physiological maturity. The duration of each stage was related to meteorological parameters: maximum temperature, minimum temperature, average temperature, rainfall, solar radiation, and thermal time. Air temperature influences soybean growth and development. The accumulated thermal time varies between years and among cultivars, and it is the main contributor to the estimated duration of the phenological stages.

Investigations of alternative kale management: Production, regrowth and quality from different sowing and defoliation dates

2007 ◽  
pp. 29-33 ◽  
Author(s):  
H.E. Brown ◽  
S. Maley ◽  
D.R. Wilson
Keyword(s):  
Sowing Date ◽  
Linear Increase ◽  
Thermal Time ◽  
Total Production

Gruner kale showed a linear increase (8.0 kg DM/ha per °Cd) in biomass with sowings on 1 October, 3 November and 1 December producing 23, 19 and 17 t DM/ha (respectively) by the 29 May. Regrowth following mid season defoliation was slow (5.3 kg DM/ha per °Cd) reducing total production (relative to undefoliated) by 7.5 and 5.5 t DM/ha for treatments defoliated on the 29 January and 14 March, respectively. Keyworks: defoliation, kale, quality, regrowth, sowing date, thermal time, yield

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