cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20011187
title: Effect of photosynthesis on Nile tilapia culture water's alkalinity

description: Abstract The physical and chemical characteristics of the culture water affect strongly the growth, reproduction, health and survival of fish. The present work was designed to evaluate the effects of the photosynthetic activity on the Nile Tilapia Oreochromis niloticus culture water's total alkalinity. There were eighteen 25-L polyethylene aquaria equally distributed in two culture systems (indoor and outdoor). At the setup fifteen 0.52 ± 0.06 g juveniles were stocked in each indoor and outdoor aquarium. The indoor and outdoor aquaria were the control and experimental group, respectively, with 9 replicates each. Fish were maintained into the aquaria for 6 weeks. Every week water samples from each aquarium were collected to determine their total alkalinity and pH. These results were submitted to ANOVA for completely random experiments at 5% level of significance. The average water pH in aquaria without and with phytoplankton were 7.32 ± 0.39 and 8.45 ± 0.40, respectively. These results were significantly different between them (P&lt;0.001). The total alkalinity of the water averaged 50.49 ± 6.07 and 63.52 ± 2.12 mg L-1 CaCO3 for the indoor and outdoor systems, respectively. These results were also significantly different between them (P &lt; 0.001).
DOI: 10.6084/m9.figshare.20011187.v1
title: Effect of photosynthesis on Nile tilapia culture water's alkalinity

description: Abstract The physical and chemical characteristics of the culture water affect strongly the growth, reproduction, health and survival of fish. The present work was designed to evaluate the effects of the photosynthetic activity on the Nile Tilapia Oreochromis niloticus culture water's total alkalinity. There were eighteen 25-L polyethylene aquaria equally distributed in two culture systems (indoor and outdoor). At the setup fifteen 0.52 ± 0.06 g juveniles were stocked in each indoor and outdoor aquarium. The indoor and outdoor aquaria were the control and experimental group, respectively, with 9 replicates each. Fish were maintained into the aquaria for 6 weeks. Every week water samples from each aquarium were collected to determine their total alkalinity and pH. These results were submitted to ANOVA for completely random experiments at 5% level of significance. The average water pH in aquaria without and with phytoplankton were 7.32 ± 0.39 and 8.45 ± 0.40, respectively. These results were significantly different between them (P&lt;0.001). The total alkalinity of the water averaged 50.49 ± 6.07 and 63.52 ± 2.12 mg L-1 CaCO3 for the indoor and outdoor systems, respectively. These results were also significantly different between them (P &lt; 0.001).
DOI: 10.6084/m9.figshare.20011190
title: Biometry and effect of temperature and of seeds size on the protrusion of cotyledonary petiole of carnauba

description: Abstract This work aimed to evaluate the biometry of carnauba seeds and the effect of temperature and seeds size on the protrusion of cotyledonary petiole. It was realized the biometric analysis with a sample of 100 seeds, evaluating length and diameter, what allowed to classify the seeds in three diameter classes. It was used a completely randomized design in a factorial arrangement 4 x 4: four seeds sizes (small - Φ &lt; 12.42 mm, medium - 12.42 mm &lt; Φ &lt; 14.24 mm, large - Φ &gt; 14.24 mm and mixture - seeds that were not classified) and four temperatures (20, 25 and 30 °C and environmental temperature - 28.8 °C). Were used four replications of 25 seeds per treatment and each experimental unit was packed in recipients containing 250 mL of water, maintained under different temperatures, realizing daily counting of the seeds that presented the protrusion of the cotyledonary petiole. The results allowed the conclusion that the length and the diameter of the carnauba seeds analyzed present an asymmetric behavior to the left. Under the temperatures of 20 and 25 ºC occurred the highest percentages of protrusion of cotyledonary petiole in all the seeds sizes, except for the large seeds, that expressed the best result only under 25 ºC. Seed of sizes medium, large and mixture presented highest protrusion speed. The temperature of 25 ºC is the one that promotes the highest protrusion speed. When maintained under 20 ºC, the seeds took 32 days to obtain maximum protrusion of the cotyledonary petiole.
DOI: 10.6084/m9.figshare.20011190.v1
title: Biometry and effect of temperature and of seeds size on the protrusion of cotyledonary petiole of carnauba

description: Abstract This work aimed to evaluate the biometry of carnauba seeds and the effect of temperature and seeds size on the protrusion of cotyledonary petiole. It was realized the biometric analysis with a sample of 100 seeds, evaluating length and diameter, what allowed to classify the seeds in three diameter classes. It was used a completely randomized design in a factorial arrangement 4 x 4: four seeds sizes (small - Φ &lt; 12.42 mm, medium - 12.42 mm &lt; Φ &lt; 14.24 mm, large - Φ &gt; 14.24 mm and mixture - seeds that were not classified) and four temperatures (20, 25 and 30 °C and environmental temperature - 28.8 °C). Were used four replications of 25 seeds per treatment and each experimental unit was packed in recipients containing 250 mL of water, maintained under different temperatures, realizing daily counting of the seeds that presented the protrusion of the cotyledonary petiole. The results allowed the conclusion that the length and the diameter of the carnauba seeds analyzed present an asymmetric behavior to the left. Under the temperatures of 20 and 25 ºC occurred the highest percentages of protrusion of cotyledonary petiole in all the seeds sizes, except for the large seeds, that expressed the best result only under 25 ºC. Seed of sizes medium, large and mixture presented highest protrusion speed. The temperature of 25 ºC is the one that promotes the highest protrusion speed. When maintained under 20 ºC, the seeds took 32 days to obtain maximum protrusion of the cotyledonary petiole.
DOI: 10.6084/m9.figshare.20011193
title: Nitrate uptake, xylem NO3- flux, and nitrate assimilation in cowpea exposed to salinity

description: Abstract This work was carried out to evaluate what is the nitrate acquisition stage (nitrate uptake, xylem nitrate flux or assimilatory reduction) most influenced by the presence of NaCl in cowpea. Twelve day-old seedlings were treated with 50 mM of NaCl in nutrient solution during four days and measurements carried out under two contrasting environmental conditions: typical day (full sun) and completely cloudy day (cloudiness). The salinity affected more intensely the xylem sap flux and nitrate flux than transpiration. Plants treated with NaCl showed a strong decrease in both nitrate uptake rate and leaf nitrate reductase activity as in the full sun as in cloudy day. Transpiration was reduced by the cloudiness while xylem sap flux and nitrate flux remained unchanged, in both salt-treated and control. Moreover, nitrate uptake and nitrate reductase activity were less affected by cloudiness than the transpiration. In addition, NaCl negatively affected nitrate accumulation in roots, stems and leaves while the cloudiness affected only the leaf nitrate accumulation, both in control and stressed plants. Salinity affects more negatively the nitrate xylem flux, as compared with the nitrate uptake and nitrate assimilatory reduction in cowpea leaves.
DOI: 10.6084/m9.figshare.20011193.v1
title: Nitrate uptake, xylem NO3- flux, and nitrate assimilation in cowpea exposed to salinity

description: Abstract This work was carried out to evaluate what is the nitrate acquisition stage (nitrate uptake, xylem nitrate flux or assimilatory reduction) most influenced by the presence of NaCl in cowpea. Twelve day-old seedlings were treated with 50 mM of NaCl in nutrient solution during four days and measurements carried out under two contrasting environmental conditions: typical day (full sun) and completely cloudy day (cloudiness). The salinity affected more intensely the xylem sap flux and nitrate flux than transpiration. Plants treated with NaCl showed a strong decrease in both nitrate uptake rate and leaf nitrate reductase activity as in the full sun as in cloudy day. Transpiration was reduced by the cloudiness while xylem sap flux and nitrate flux remained unchanged, in both salt-treated and control. Moreover, nitrate uptake and nitrate reductase activity were less affected by cloudiness than the transpiration. In addition, NaCl negatively affected nitrate accumulation in roots, stems and leaves while the cloudiness affected only the leaf nitrate accumulation, both in control and stressed plants. Salinity affects more negatively the nitrate xylem flux, as compared with the nitrate uptake and nitrate assimilatory reduction in cowpea leaves.
DOI: 10.6084/m9.figshare.20011195
title: Physiologic responses of precocious dwarf cashew at different levels of salinity

description: Abstract Salinity is an abiotic stress that alters the plant development, limiting plant production. At the present experiment, it was evaluated the effect of salt stress on osmotic potential, content of organic and inorganic solutes, gas exchanges (photosynthesis, transpiration and stomatal conductance) and production of precocious dwarf cashew (Anacardium occidentale L.). For this, the experiment was carried out at Embrapa Agroindústria Tropical experimental station, in Pacajús, Ceará, Brazil, during the months of August to December. The plants were subjected to increasing levels of salinity using irrigation water with electrical conductivity (ECw) of 0.5 (control), 4.0, 8.0 and 12.0 dS m-1. The data were collected monthly and subjected to statistic analyses. Although the electrical conductivity of soil saturation extract (ECse) increased with salinity, there were no significant differences between treatments for osmotic potential, gas exchange and levels of organic and inorganic solutes. With the exception of leaf osmotic potential and gas exchange, all the others parameters studied varied along the experiment in function of the phenophisiological stage of the plant, presenting greater values in the fructification period. So, the salinity stress was not enough to cause significant changes in growth and productivity of the plants.
DOI: 10.6084/m9.figshare.20011195.v1
title: Physiologic responses of precocious dwarf cashew at different levels of salinity

description: Abstract Salinity is an abiotic stress that alters the plant development, limiting plant production. At the present experiment, it was evaluated the effect of salt stress on osmotic potential, content of organic and inorganic solutes, gas exchanges (photosynthesis, transpiration and stomatal conductance) and production of precocious dwarf cashew (Anacardium occidentale L.). For this, the experiment was carried out at Embrapa Agroindústria Tropical experimental station, in Pacajús, Ceará, Brazil, during the months of August to December. The plants were subjected to increasing levels of salinity using irrigation water with electrical conductivity (ECw) of 0.5 (control), 4.0, 8.0 and 12.0 dS m-1. The data were collected monthly and subjected to statistic analyses. Although the electrical conductivity of soil saturation extract (ECse) increased with salinity, there were no significant differences between treatments for osmotic potential, gas exchange and levels of organic and inorganic solutes. With the exception of leaf osmotic potential and gas exchange, all the others parameters studied varied along the experiment in function of the phenophisiological stage of the plant, presenting greater values in the fructification period. So, the salinity stress was not enough to cause significant changes in growth and productivity of the plants.
DOI: 10.6084/m9.figshare.20011196
title: Plant arrangement and grain yield of two simple maize hybrids

description: Abstract The objective of this work was to evaluate the effect of plant arrangement on grain yield and mass of a thousand kernels of two simple corn hybrids, in the North region of Paraná State. The combination among two plant row spacing (0.45 and 0.90 m), four plant population densities (45,000, 60,000, 75,000 and 90,000 plants ha-1), two corn hybrids (DKB 234 and DKB 214) and two growing seasons (2005/06 and 2006/07) constituted the treatments. Experiments were designed in randomized complete blocks, in 2 x 2 x 4 x 2 factorial scheme, with four replications. The hybrid DKB 234 presented the highest grain yield, while hybrid DKB 214 presented the highest mass of a thousand kernels. In general, the plant row spacing did not affect too much the grain yield, being a viable option to crop the corn hybrids DKB 214 and DKB 234 for grain yield. The fine plant population density for grain yield of hybrid DKB 234 ranged from 65,000 to 75,000 plants ha-1, while this fine plant population density for grain yield of hybrid DKB 214 was about 70,000 to 80,000 plants ha-1. The fine plant population density for mass of a thousand kernels was 55,000 plants ha-1.
DOI: 10.6084/m9.figshare.20011196.v1
title: Plant arrangement and grain yield of two simple maize hybrids

description: Abstract The objective of this work was to evaluate the effect of plant arrangement on grain yield and mass of a thousand kernels of two simple corn hybrids, in the North region of Paraná State. The combination among two plant row spacing (0.45 and 0.90 m), four plant population densities (45,000, 60,000, 75,000 and 90,000 plants ha-1), two corn hybrids (DKB 234 and DKB 214) and two growing seasons (2005/06 and 2006/07) constituted the treatments. Experiments were designed in randomized complete blocks, in 2 x 2 x 4 x 2 factorial scheme, with four replications. The hybrid DKB 234 presented the highest grain yield, while hybrid DKB 214 presented the highest mass of a thousand kernels. In general, the plant row spacing did not affect too much the grain yield, being a viable option to crop the corn hybrids DKB 214 and DKB 234 for grain yield. The fine plant population density for grain yield of hybrid DKB 234 ranged from 65,000 to 75,000 plants ha-1, while this fine plant population density for grain yield of hybrid DKB 214 was about 70,000 to 80,000 plants ha-1. The fine plant population density for mass of a thousand kernels was 55,000 plants ha-1.
DOI: 10.6084/m9.figshare.20011198.v1
title: Qualitative aspects of the water from Poty River at Teresina, Piaui State, Brazil

description: Abstract The water quality of the Poty River was evaluated to agricultural purposes at Teresina, Piaui State, Brazil in periods of extreme temperatures and precipitation. Samples of water were collected in the river in 10 georeference points, at the São Paulo Residential curve (southeast zone) until the mouth in the Parnaíba River (north zone), in an approximate course of 23.7 km, from June to December 2004. Were determined the physicochemical variable ECw, SAR and the pH, besides the concentrations of Cl-, HCO3 -, CO3 2-, Na+ and Ca2+. The largest values of ECw (0.26 dS m-1) and the SAR (1.90 mmolc L-1)0,5 were registered in the month of October, due to the low index of rains, dry period and eventual human pollution. The Kruskal-Wallis test verified oscillations in the concentrations of HCO3- (1.68 to 1.91 mmolc L-1) along the sampled points. The RSC indicated that the water is adequate for agricultural purposes (&lt;1.25 mmolcL-1).
DOI: 10.6084/m9.figshare.20011198
title: Qualitative aspects of the water from Poty River at Teresina, Piaui State, Brazil

description: Abstract The water quality of the Poty River was evaluated to agricultural purposes at Teresina, Piaui State, Brazil in periods of extreme temperatures and precipitation. Samples of water were collected in the river in 10 georeference points, at the São Paulo Residential curve (southeast zone) until the mouth in the Parnaíba River (north zone), in an approximate course of 23.7 km, from June to December 2004. Were determined the physicochemical variable ECw, SAR and the pH, besides the concentrations of Cl-, HCO3 -, CO3 2-, Na+ and Ca2+. The largest values of ECw (0.26 dS m-1) and the SAR (1.90 mmolc L-1)0,5 were registered in the month of October, due to the low index of rains, dry period and eventual human pollution. The Kruskal-Wallis test verified oscillations in the concentrations of HCO3- (1.68 to 1.91 mmolc L-1) along the sampled points. The RSC indicated that the water is adequate for agricultural purposes (&lt;1.25 mmolcL-1).
DOI: 10.6084/m9.figshare.20011201
title: Characterization and genetic divergence of corn populations rescued from the region southeastern of Minas Gerais

description: Abstract The objective of this work was to characterize and evaluate corn populations rescued from the southeastern of Minas Gerais, concerning potential yield and genetic divergence. Were used quantitative and qualitative descriptors of corncob and caryopsis to discrimination of populations. The experiment was installed in a randomized complete block design with two replications. Were evaluated four commercial hybrids, five landraces populations and seven farmers' field populations. Sixteen descriptors were applied to the germoplasm, being nine quantitative and seven qualitative. For quantitative descriptors genetic divergence was estimated based on canonical variables. For qualitative descriptors, cluster analysis was applied based on the method of optimization of Tocher, where the distance to multicategory data was the measure of dissimilarity between genotypes. There is genetic variability between the populations evaluated considering the descriptors in question. The quantitative descriptors that contributed most to the genetic divergence between the genotypes were number of grain rows, grain width and cob diameter. Some populations may have been crossed with commercial hybrids in rural properties and some populations have potential to be used in breeding programs, therefore this information on similarity should be used altogether.
DOI: 10.6084/m9.figshare.20011201.v1
title: Characterization and genetic divergence of corn populations rescued from the region southeastern of Minas Gerais

description: Abstract The objective of this work was to characterize and evaluate corn populations rescued from the southeastern of Minas Gerais, concerning potential yield and genetic divergence. Were used quantitative and qualitative descriptors of corncob and caryopsis to discrimination of populations. The experiment was installed in a randomized complete block design with two replications. Were evaluated four commercial hybrids, five landraces populations and seven farmers' field populations. Sixteen descriptors were applied to the germoplasm, being nine quantitative and seven qualitative. For quantitative descriptors genetic divergence was estimated based on canonical variables. For qualitative descriptors, cluster analysis was applied based on the method of optimization of Tocher, where the distance to multicategory data was the measure of dissimilarity between genotypes. There is genetic variability between the populations evaluated considering the descriptors in question. The quantitative descriptors that contributed most to the genetic divergence between the genotypes were number of grain rows, grain width and cob diameter. Some populations may have been crossed with commercial hybrids in rural properties and some populations have potential to be used in breeding programs, therefore this information on similarity should be used altogether.
DOI: 10.6084/m9.figshare.20011219
title: Adapting the National Sanitation Foundation water quality index to the Brazilian semiarid

description: Knowledge of the water quality of a reservoir used for human consumption is important. Water quality indices are used to facilitate understanding of this quality. This study aimed to adapt and compare the water quality index of the National Sanitation Foundation to the physical, chemical and biological conditions of artificial reservoirs in regions with tropical semiarid climate and its spatio-temporal variability. Twelve water samples were taken between April 2008 to April 2010 in seven sampling points distributed in Orós reservoir in the southern of Ceará. Water quality attributes that were monitored and used for calculation and adjustment of the index were: pH, temperature, dissolved oxygen, biochemical oxygen demand, total phosphorus, nitrate, total solids, turbidity and fecal coliform. From them, we used the Principal Component Analysis to determine the weights to be associated with the parameters of the water quality index and adapt it to reservoirs of semiarid climates. The water quality of the reservoir was classified as regular for most of the study period. Although varying with rainfall, there was effect of seasonality on water quality. It was observed that the index adapted to semiarid climate regions is statistically different from indices from other regions. However, the difference is observed only in sensitivity and weigths of determining attributes quality.
DOI: 10.6084/m9.figshare.20011219.v1
title: Adapting the National Sanitation Foundation water quality index to the Brazilian semiarid

description: Knowledge of the water quality of a reservoir used for human consumption is important. Water quality indices are used to facilitate understanding of this quality. This study aimed to adapt and compare the water quality index of the National Sanitation Foundation to the physical, chemical and biological conditions of artificial reservoirs in regions with tropical semiarid climate and its spatio-temporal variability. Twelve water samples were taken between April 2008 to April 2010 in seven sampling points distributed in Orós reservoir in the southern of Ceará. Water quality attributes that were monitored and used for calculation and adjustment of the index were: pH, temperature, dissolved oxygen, biochemical oxygen demand, total phosphorus, nitrate, total solids, turbidity and fecal coliform. From them, we used the Principal Component Analysis to determine the weights to be associated with the parameters of the water quality index and adapt it to reservoirs of semiarid climates. The water quality of the reservoir was classified as regular for most of the study period. Although varying with rainfall, there was effect of seasonality on water quality. It was observed that the index adapted to semiarid climate regions is statistically different from indices from other regions. However, the difference is observed only in sensitivity and weigths of determining attributes quality.
DOI: 10.5281/zenodo.6426878
title: Data SRL EdTech & Academic Achievement

description: Systematic literature review data. The documentary sources are from articles published in scientific journals during the period 2013–2021, which include the following Education Resources Information Center (ERIC) Thesaurus terms as descriptors: "Technology uses in Education", "Mathematics Achievement", "Reading Achievement", "Writing Achievement" and "Science Achievement."
DOI: 10.5281/zenodo.6426877
title: Data SRL EdTech & Academic Achievement

description: Systematic literature review data. The documentary sources are from articles published in scientific journals during the period 2013–2021, which include the following Education Resources Information Center (ERIC) Thesaurus terms as descriptors: "Technology uses in Education", "Mathematics Achievement", "Reading Achievement", "Writing Achievement" and "Science Achievement."