scholarly journals Physiological maturity of Tabebuia aurea (Silva Manso) Benth. & Hook. f. ex S. Moore seeds

2019 ◽  
Vol 41 (4) ◽  
pp. 498-505
Author(s):  
Brenna Rafaella Veríssimo dos Santos ◽  
Clarisse Pereira Benedito ◽  
Salvador Barros Torres ◽  
Caio César Pereira Leal ◽  
Tatianne Raianne Costa Alves
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Physiological Maturity ◽  
Post Harvest ◽  
Maturation Stages ◽  
Length Width ◽  
Dark Green ◽  
Biochemical Indices ◽  
Light Green ◽  
Green Stage

Abstract: The purpose of this research was to verify the efficiency of physical and biochemical indices in determining the physiological maturity of Tabebuia aurea seeds, as well as to evaluate the post-harvest storage of fruits with different maturation stages on germination and vigor. For this, 200 fruits were classified as dark green (stage I), light green (stage II), and light brown (stage III) epicarp. Freshly harvested fruits were evaluated for length, width, and weight and their seeds for length, width, thickness, thousand-seed weight, water content, electrical conductivity, and chemical composition. Subsequently, a factorial consisting of three maturation stages and four storage periods of fruits (0, 5, 10 and 15 days) were used, and water content, germination, germination speed index, root length, shoot length, and seedling dry matter were evaluated. Physical and biochemical indices can be used as maturation indicators in T. aurea seeds, except fruit length, seed thickness, electrical conductivity, and protein content. The maximum germination and vigor of T. aurea seeds were obtained in fruits at stages I (dark green) or II (light green) associated with post-harvest storage of fifteen days.

scholarly journals The physiological quality of ‘Chilli pepper’ seeds, extracted from fruits harvested at different stages of maturation, with and without post-harvest rest

2020 ◽  
pp. 739-743
Author(s):  
Pâmela Gomes Nakda-Freitas ◽  
Natália de Brito Lima Lanna ◽  
Priscilla Nátaly de Lima Silva ◽  
Estefânia Martins Bardiviesso ◽  
Ana Emília Barbosa Tavares ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Relative Humidity ◽  
Shoot Length ◽  
Chilli Pepper ◽  
Post Harvest ◽  
Maturation Stages ◽  
Physiological Quality ◽  
Days After Anthesis ◽  
Seeds Germination

The objective of this study was to evaluate the physiological quality of ‘Chilli pepper’ seeds, extracted from fruits harvested at different stages of maturation, with and without post-harvest rest. Twelve treatments resulted from the 6 x 2 factorial, with six maturation stages (100% green fruits, 90% green and 10% orange fruits, 10% green and 90% orange fruits, 100% orange fruits, 100% red fruits and 100 % matte red fruits, corresponding to 44, 53, 60, 63, 70 and 73 days after anthesis (DAA), respectively), and fruits with and without rest for seven days. Seeds were evaluated two months after extraction as well as after 14 months of storage in a dry chamber (40% relative humidity and 20°C). The characteristics evaluated were: weight of a thousand seeds, germination, first count, electrical conductivity, emergency test and shoot length of seedlings. Fruits of orange chilli pepper 'Malagueta' kept at rest for seven days and bright red fruits and matte without rest produce seeds with physiological quality, which are maintained after a period of 14 months stored in a chamber with 40% relative humidity at 20°C.

scholarly journals Physiological maturity of seeds and colorimetry of fruits of Jatropha curcas L.

2010 ◽  
Vol 32 (4) ◽  
pp. 158-165 ◽  
Author(s):  
João Alexandre Lopes Dranski ◽  
Artur Soares Pinto Júnior ◽  
Fábio Steiner ◽  
Tiago Zoz ◽  
Ubirajara Contro Malavasi ◽  
...  
Keyword(s):  
Water Content ◽  
Jatropha Curcas ◽  
Dry Mass ◽  
Germination Test ◽  
Physiological Maturity ◽  
Jatropha Curcas L ◽  
Digital Colorimetry ◽  
Maturation Stages ◽  
Color Analyzer ◽  
In Virtue Of

The objective was to relate the coloration of fruits of Jatropha curcas L during the maturation process with morphometric (fruits and seeds) and germinative characteristics (seeds). Fruits were collected at various maturation stages from mast trees located in Eldorado/MS, and six maturation stages were visually classified based on fruit's epicarp color. Epicarp digital colorimetry was used to characterize maturation stages in addition to morphometric variables of length and width of fruits and seeds, as well their water content. For determining the physiological potential it was used germination test, emergence velocity index and first count of germination. Results indicated that seeds of J. curcas should be harvested when fruit epicarp shows a reading equal or smaller than 82, 70 or 65 nm of red, green or blue scales from a digital color analyzer. Seeds of fruits with that colorimetry can be harvested in virtue of the maxim acumululation of dry mass, water content below 38,5% and higher physiological potential.

scholarly journals Temporal stability of electrical conductivity in a sandy soil

2016 ◽  
Vol 30 (3) ◽  
pp. 349-357 ◽  
Author(s):  
Aura Pedrera-Parrilla ◽  
Eric C. Brevik ◽  
Juan V. Giráldez ◽  
Karl Vanderlinden
Keyword(s):  
Electrical Conductivity ◽  
Spatial Variability ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Precision Agriculture ◽  
Temporal Stability ◽  
Principal Component ◽  
Model Parameters ◽  
Soil Spatial Variability

Abstract Understanding of soil spatial variability is needed to delimit areas for precision agriculture. Electromagnetic induction sensors which measure the soil apparent electrical conductivity reflect soil spatial variability. The objectives of this work were to see if a temporally stable component could be found in electrical conductivity, and to see if temporal stability information acquired from several electrical conductivity surveys could be used to better interpret the results of concurrent surveys of electrical conductivity and soil water content. The experimental work was performed in a commercial rainfed olive grove of 6.7 ha in the ‘La Manga’ catchment in SW Spain. Several soil surveys provided gravimetric soil water content and electrical conductivity data. Soil electrical conductivity values were used to spatially delimit three areas in the grove, based on the first principal component, which represented the time-stable dominant spatial electrical conductivity pattern and explained 86% of the total electrical conductivity variance. Significant differences in clay, stone and soil water contents were detected between the three areas. Relationships between electrical conductivity and soil water content were modelled with an exponential model. Parameters from the model showed a strong effect of the first principal component on the relationship between soil water content and electrical conductivity. Overall temporal stability of electrical conductivity reflects soil properties and manifests itself in spatial patterns of soil water content.

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