cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20017964.v1
title: Energy performance of farm tractor with single radial versus dual diagonal wheels in harrowing operations

description: ABSTRACT The farm tractor wheel interacts directly with the soil, affecting its energy and operational performance. Several works study the particularities between configurations of wheelset seeking to interpret the most efficient type and arrangement of the wheelset. However, there is still a demand for studies that elucidate decision-making regarding changing the type of wheelset or improving the pre-existing arrangement. The experiment aimed to evaluate the energy performance of farm tractors equipped with Single radial and Dual diagonal wheels in rear axle in intermediate harrowing operation. The experiment was conducted in a randomized block design. Two-wheel arrangements (Single radial and Dual diagonal) were used in the blocks, and four target velocities (4, 6, 8, and 10 km h-1), with four replicates in the subblocks, totalizing 32 experimental units. Slip of wheels, engine rotation, hourly and specific fuel consumption, force, power, and efficiency in the drawbar, operational velocity, and engine thermal efficiency were monitored. The data collected were submitted to analysis of variance and, when significant, to the Tukey test and regression analysis. The Single radial tires provided an increase in velocity and drawbar force without increasing fuel consumption, consequently providing an increase in energy and operating performance in intermediate harrowing operation.
DOI: 10.6084/m9.figshare.20017966
title: Photosynthetic pigments, photochemical efficiency and growth of custard-apple under salt stress and potassium fertilization

description: ABSTRACT The salt stress caused by irrigation water with high concentration of salts stands out as one of the main limiting factors in agricultural production in the semiarid region of Northeastern Brazil. In this context, the objective of this study was to evaluate the photosynthetic pigments, the photochemical efficiency, and the growth of custard-apple irrigated with saline water and potassium doses. The research was carried out under field conditions in a randomized block design in a 2 × 5 factorial scheme, corresponding to two values of electrical conductivity of irrigation water - ECw (1.3 and 4.0 dS m-1) and five potassium doses (50, 75, 100, 125 and 150% of the recommendation). The dose referring to 100% corresponded to the application of 20 g of K2O per plant per year. ECw of 4.0 dS m-1 reduced the synthesis of chlorophyll a, total chlorophyll, and carotenoids in custard-apple, at 245 days after transplanting. Fertilization doses of 50 to 150% of the recommendation inhibited the synthesis of chlorophyll b and the absolute and relative growth rates in stem diameter of custard-apple plants irrigated with water of highest electrical conductivity. Reduction in the quantum efficiency of photosystem II in custard-apple cultivated under ECw of 4.0 dS m-1 is related to photoinhibitory damage to photosystem II. Potassium fertilization did not alleviate the stress caused by water salinity on the growth of custard-apple, during 151-245 days after transplantation.
DOI: 10.6084/m9.figshare.20017966.v1
title: Photosynthetic pigments, photochemical efficiency and growth of custard-apple under salt stress and potassium fertilization

description: ABSTRACT The salt stress caused by irrigation water with high concentration of salts stands out as one of the main limiting factors in agricultural production in the semiarid region of Northeastern Brazil. In this context, the objective of this study was to evaluate the photosynthetic pigments, the photochemical efficiency, and the growth of custard-apple irrigated with saline water and potassium doses. The research was carried out under field conditions in a randomized block design in a 2 × 5 factorial scheme, corresponding to two values of electrical conductivity of irrigation water - ECw (1.3 and 4.0 dS m-1) and five potassium doses (50, 75, 100, 125 and 150% of the recommendation). The dose referring to 100% corresponded to the application of 20 g of K2O per plant per year. ECw of 4.0 dS m-1 reduced the synthesis of chlorophyll a, total chlorophyll, and carotenoids in custard-apple, at 245 days after transplanting. Fertilization doses of 50 to 150% of the recommendation inhibited the synthesis of chlorophyll b and the absolute and relative growth rates in stem diameter of custard-apple plants irrigated with water of highest electrical conductivity. Reduction in the quantum efficiency of photosystem II in custard-apple cultivated under ECw of 4.0 dS m-1 is related to photoinhibitory damage to photosystem II. Potassium fertilization did not alleviate the stress caused by water salinity on the growth of custard-apple, during 151-245 days after transplantation.
DOI: 10.6084/m9.figshare.20017967
title: Development of an ethylometer with an MQ-3 sensor for measuring ethanol in soybean seeds

description: ABSTRACT In the seed production sector, it is essential to use fast and practical equipment to help decision-making processes. Thus, the use of sensors that can capture information to assist in agriculture has contributed significantly to soybean cultivation worldwide, being used in several stages, whether pre-harvest or post-harvest. Thus, this study aimed to develop a prototype of ethylometer with an MQ-3 sensor and to evaluate its stabilization time when used in soybean seed lots submitted to hypoxia. The research was carried out with 10 lots of soybean seeds from five cultivars (NS 8383 RR, SOY Peso RR, M 8372 IPRO, M8644 IPRO and M8808 IPRO) and was divided into two stages. The first one corresponds to the development of the ethanol measuring equipment with an MQ-3 sensor, and the second one to measurement of the sensor’s stabilization time (3, 6, 9, 12, 15, 18, 21, 24, 27, and 30 s) in soybean seeds submitted to anaerobiosis. The equipment and the MQ-3 sensor showed the stability of average measurement at 16 s after activation. This time is recommended for use of the ethylometer in soybean seeds. Through the MQ-3 sensor, it is possible to efficiently detect ethanol present in the air released by soy seeds during the anaerobic process.
DOI: 10.6084/m9.figshare.20017967.v1
title: Development of an ethylometer with an MQ-3 sensor for measuring ethanol in soybean seeds

description: ABSTRACT In the seed production sector, it is essential to use fast and practical equipment to help decision-making processes. Thus, the use of sensors that can capture information to assist in agriculture has contributed significantly to soybean cultivation worldwide, being used in several stages, whether pre-harvest or post-harvest. Thus, this study aimed to develop a prototype of ethylometer with an MQ-3 sensor and to evaluate its stabilization time when used in soybean seed lots submitted to hypoxia. The research was carried out with 10 lots of soybean seeds from five cultivars (NS 8383 RR, SOY Peso RR, M 8372 IPRO, M8644 IPRO and M8808 IPRO) and was divided into two stages. The first one corresponds to the development of the ethanol measuring equipment with an MQ-3 sensor, and the second one to measurement of the sensor’s stabilization time (3, 6, 9, 12, 15, 18, 21, 24, 27, and 30 s) in soybean seeds submitted to anaerobiosis. The equipment and the MQ-3 sensor showed the stability of average measurement at 16 s after activation. This time is recommended for use of the ethylometer in soybean seeds. Through the MQ-3 sensor, it is possible to efficiently detect ethanol present in the air released by soy seeds during the anaerobic process.
DOI: 10.6084/m9.figshare.20017972
title: Nutrients in ‘Gigante’ forage cactus pear under different saline water irrigation depths and planting densities

description: ABSTRACT Climate variability tends to increase the occurrence of extreme drought conditions in semi-arid regions, thereby compromising crop yield, including that of drought-tolerant plants such as forage cactus pear. Irrigation of cactus with saline water has enabled good results, and its combination with changes in planting densities may promote changes in the production response of this crop. A field experiment spanning two crop cycles was carried out to evaluate nutrient concentrations in ‘Gigante’ forage cactus pear (Opuntia ficus-indica Mill) under different saline water irrigation depths and planting densities. A randomized block design was used with treatments arranged in split-split plots. Two irrigation intervals (7 and 14 days) were assigned to plots, four planting densities (20,000; 40,000; 60,000 and 80,000 plants ha-1) to subplots, and four irrigation depths of saline water of electrical conductivity 2.91 dS m-1 (0, 11, 22 and 33% of reference evapotranspiration) to sub-subplots. The irrigation depths were applied only in the period of the year without rain. Intermediate planting densities (43,002 and 54,687 plants ha-1) promote lower P, Ca and Fe concentrations in cladode tissues of forage cactus pear. Irrigating ‘Gigante’ cactus forage with saline water up to 33% ETo increases the concentrations of N, P, Ca, Mg, B, Cu, Mn and Zn in cladode tissues. Irrigation levels between 16 and 25% of ETo with saline water resulted in the highest concentrations of K, S and Na.
DOI: 10.6084/m9.figshare.20017972.v1
title: Nutrients in ‘Gigante’ forage cactus pear under different saline water irrigation depths and planting densities

description: ABSTRACT Climate variability tends to increase the occurrence of extreme drought conditions in semi-arid regions, thereby compromising crop yield, including that of drought-tolerant plants such as forage cactus pear. Irrigation of cactus with saline water has enabled good results, and its combination with changes in planting densities may promote changes in the production response of this crop. A field experiment spanning two crop cycles was carried out to evaluate nutrient concentrations in ‘Gigante’ forage cactus pear (Opuntia ficus-indica Mill) under different saline water irrigation depths and planting densities. A randomized block design was used with treatments arranged in split-split plots. Two irrigation intervals (7 and 14 days) were assigned to plots, four planting densities (20,000; 40,000; 60,000 and 80,000 plants ha-1) to subplots, and four irrigation depths of saline water of electrical conductivity 2.91 dS m-1 (0, 11, 22 and 33% of reference evapotranspiration) to sub-subplots. The irrigation depths were applied only in the period of the year without rain. Intermediate planting densities (43,002 and 54,687 plants ha-1) promote lower P, Ca and Fe concentrations in cladode tissues of forage cactus pear. Irrigating ‘Gigante’ cactus forage with saline water up to 33% ETo increases the concentrations of N, P, Ca, Mg, B, Cu, Mn and Zn in cladode tissues. Irrigation levels between 16 and 25% of ETo with saline water resulted in the highest concentrations of K, S and Na.
DOI: 10.6084/m9.figshare.20017973.v1
title: Low-cost and high-efficiency automated tensiometer for real-time irrigation monitoring

description: ABSTRACT Knowing the soil moisture available to plants is important for adequate management of water use in agricultural farms, with automated methods being the most accurate. However, acquisition costs are high and most of the commercially available irrigation controllers still work using pre-set times. This study aimed to develop and calibrate a low-cost automated tensiometer with high efficiency in irrigation control, based on real-time monitoring. The research was conducted at the Laboratories of Hydraulics and of Water Soil Plant and Atmosphere Relationship, which belong to the Federal University of Grande Dourados (UFGD), in Dourados, MS, Brazil, with soil classified as an Oxisol. Pressure transducers and a microcontroller were used to assimilate the pressure inside tensiometers and transform it into readings of soil water matric potential (Ψm). Thus, the calibration was carried out by comparing the different readings of the transducer and digital tension meter. Different tensions were applied to obtain a soil moisture curve, starting from the most humid point (saturated) to the driest one (oven-dried soil), collecting 20 valid points. Subsequently, the data were subjected to the normality test, with subsequent statistical analysis and regression curve models. Linear adjustments with a high coefficient of determination (R2 = 0.99) were observed, with the automated system built in this study being capable of monitoring soil water tension in real-time.
DOI: 10.6084/m9.figshare.20017973
title: Low-cost and high-efficiency automated tensiometer for real-time irrigation monitoring

description: ABSTRACT Knowing the soil moisture available to plants is important for adequate management of water use in agricultural farms, with automated methods being the most accurate. However, acquisition costs are high and most of the commercially available irrigation controllers still work using pre-set times. This study aimed to develop and calibrate a low-cost automated tensiometer with high efficiency in irrigation control, based on real-time monitoring. The research was conducted at the Laboratories of Hydraulics and of Water Soil Plant and Atmosphere Relationship, which belong to the Federal University of Grande Dourados (UFGD), in Dourados, MS, Brazil, with soil classified as an Oxisol. Pressure transducers and a microcontroller were used to assimilate the pressure inside tensiometers and transform it into readings of soil water matric potential (Ψm). Thus, the calibration was carried out by comparing the different readings of the transducer and digital tension meter. Different tensions were applied to obtain a soil moisture curve, starting from the most humid point (saturated) to the driest one (oven-dried soil), collecting 20 valid points. Subsequently, the data were subjected to the normality test, with subsequent statistical analysis and regression curve models. Linear adjustments with a high coefficient of determination (R2 = 0.99) were observed, with the automated system built in this study being capable of monitoring soil water tension in real-time.
DOI: 10.6084/m9.figshare.20017976
title: Carbon sequestration by plant species used in green roofs across different periods

description: ABSTRACT This study evaluated the influence of three plant species and two periods on the amount of carbon stored in the substrate in an extensive green roof. The study was carried out in March and September 2020 at Charles Darwin Business Garage Building, Recife, Pernambuco state, Brazil. A completely randomized design with a split-plot scheme was adopted, with plant species (zoysia grass [Zoysia japonica], inch plant [Tradescantia zebrina], and fountain grass [Pennisetum setaceum]) allocated to plots and the material collection periods (March and September) to subplots. The CO2 and organic carbon concentrations in the substrate were quantified. Thirty samples were obtained from the substrate during each period. No statistically significant difference was observed in CO2 content among species treatments; however, there was a significant difference between the two periods evaluated, with average values of 14.05 and 96.97 mg in March and September, respectively. Therefore, September has the greatest potential for CO2 storage in the substrate. Significant differences were observed in organic carbon concentrations among species and between periods, with average values of 95.05 and 129.22 g kg-1 for fountain grass and inch plant, respectively, and 131.15 and 100.81 g kg-1 in March and September, respectively.
DOI: 10.6084/m9.figshare.20017976.v1
title: Carbon sequestration by plant species used in green roofs across different periods

description: ABSTRACT This study evaluated the influence of three plant species and two periods on the amount of carbon stored in the substrate in an extensive green roof. The study was carried out in March and September 2020 at Charles Darwin Business Garage Building, Recife, Pernambuco state, Brazil. A completely randomized design with a split-plot scheme was adopted, with plant species (zoysia grass [Zoysia japonica], inch plant [Tradescantia zebrina], and fountain grass [Pennisetum setaceum]) allocated to plots and the material collection periods (March and September) to subplots. The CO2 and organic carbon concentrations in the substrate were quantified. Thirty samples were obtained from the substrate during each period. No statistically significant difference was observed in CO2 content among species treatments; however, there was a significant difference between the two periods evaluated, with average values of 14.05 and 96.97 mg in March and September, respectively. Therefore, September has the greatest potential for CO2 storage in the substrate. Significant differences were observed in organic carbon concentrations among species and between periods, with average values of 95.05 and 129.22 g kg-1 for fountain grass and inch plant, respectively, and 131.15 and 100.81 g kg-1 in March and September, respectively.
DOI: 10.6084/m9.figshare.20017978.v1
title: Salicylic acid attenuates the harmful effects of salt stress on basil

description: ABSTRACT The salinity of irrigation water and soil create considerable challenges in agriculture, as they harm the physiological processes and growth of plants. The exogenous application of antioxidant compounds, such as salicylic acid, can reduce the damage caused by salt stress. Thus, this study aimed to evaluate the attenuation of salt stress induced by salicylic acid in Ocimum basilicum “Cinnamon”. The experiment was performed in randomized blocks with five irrigation water salinity levels (0.5, 1.3, 3.25, 5.2 and 6.0 dS m-1) and five salicylic acid concentrations (0, 0.29, 1.0, 1.71 and 2.0 mM), with five repetitions and two plants per plot. Growth, gas exchange, and chlorophyll indices and fluorescence were evaluated 30 days after the salt treatment was applied. An increase in the salinity of irrigation water decreased the plant height, stem diameter, number of leaves, stomatal conductance, instantaneous water use efficiency, and initial fluorescence of basil “Cinnamon”. Salicylic acid was revealed to attenuate the harmful effects of irrigation water salinity on gas exchange, total chlorophyll, and initial and maximum fluorescence of basil plants.
DOI: 10.6084/m9.figshare.20017978
title: Salicylic acid attenuates the harmful effects of salt stress on basil

description: ABSTRACT The salinity of irrigation water and soil create considerable challenges in agriculture, as they harm the physiological processes and growth of plants. The exogenous application of antioxidant compounds, such as salicylic acid, can reduce the damage caused by salt stress. Thus, this study aimed to evaluate the attenuation of salt stress induced by salicylic acid in Ocimum basilicum “Cinnamon”. The experiment was performed in randomized blocks with five irrigation water salinity levels (0.5, 1.3, 3.25, 5.2 and 6.0 dS m-1) and five salicylic acid concentrations (0, 0.29, 1.0, 1.71 and 2.0 mM), with five repetitions and two plants per plot. Growth, gas exchange, and chlorophyll indices and fluorescence were evaluated 30 days after the salt treatment was applied. An increase in the salinity of irrigation water decreased the plant height, stem diameter, number of leaves, stomatal conductance, instantaneous water use efficiency, and initial fluorescence of basil “Cinnamon”. Salicylic acid was revealed to attenuate the harmful effects of irrigation water salinity on gas exchange, total chlorophyll, and initial and maximum fluorescence of basil plants.
DOI: 10.6084/m9.figshare.20017982
title: Salicylic acid improves physiological indicators of soursop irrigated with saline water

description: ABSTRACT Plants grown under salinity are subject to osmotic and ionic stresses that cause several physiological changes, so searching for strategies that minimize the deleterious effects is essential for the development of irrigated agriculture. In this context, the objective was to evaluate the effects of foliar applications of salicylic acid on the mitigation of the effects of salt stress on photosynthetic pigments and chlorophyll a fluorescence of soursop cv. Morada Nova. The study was conducted in a greenhouse, in a randomized block design and 5 × 4 factorial arrangement, with five values of electrical conductivity of irrigation water - ECw (0.8 - control, 1.6, 2.4, 3.2 and 4.0 dS m-1) and four concentrations of salicylic acid - SA (0, 1.2, 2.4 and 3.6 mM), with three replicates. Foliar application of salicylic acid at a concentration of 1.4 mM mitigated the effects of salt stress on chlorophyll a, chlorophyll b, chlorophyll total, and carotenoids of soursop when irrigated with water of up to 1.5 dS m-1. Salicylic acid at concentrations above 1.4 mM combined with irrigation with saline water intensified the deleterious effects on photosynthetic pigments. Chlorophyll a fluorescence was not influenced by salicylic acid sprays up to the concentration of 3.6 mM.
DOI: 10.6084/m9.figshare.20017982.v1
title: Salicylic acid improves physiological indicators of soursop irrigated with saline water

description: ABSTRACT Plants grown under salinity are subject to osmotic and ionic stresses that cause several physiological changes, so searching for strategies that minimize the deleterious effects is essential for the development of irrigated agriculture. In this context, the objective was to evaluate the effects of foliar applications of salicylic acid on the mitigation of the effects of salt stress on photosynthetic pigments and chlorophyll a fluorescence of soursop cv. Morada Nova. The study was conducted in a greenhouse, in a randomized block design and 5 × 4 factorial arrangement, with five values of electrical conductivity of irrigation water - ECw (0.8 - control, 1.6, 2.4, 3.2 and 4.0 dS m-1) and four concentrations of salicylic acid - SA (0, 1.2, 2.4 and 3.6 mM), with three replicates. Foliar application of salicylic acid at a concentration of 1.4 mM mitigated the effects of salt stress on chlorophyll a, chlorophyll b, chlorophyll total, and carotenoids of soursop when irrigated with water of up to 1.5 dS m-1. Salicylic acid at concentrations above 1.4 mM combined with irrigation with saline water intensified the deleterious effects on photosynthetic pigments. Chlorophyll a fluorescence was not influenced by salicylic acid sprays up to the concentration of 3.6 mM.
DOI: 10.6084/m9.figshare.20017984
title: Morphocultural and pathogenic characterization of Colletotrichum gossypii and Colletotrichum gossypii var. cephalosporioides under different temperatures

description: ABSTRACT Considering the importance of identifying Colletotrichum species associated with cotton plants, this study aimed to characterize the morphological and pathogenic isolates of C. gossypii var. cephalosporioides and C. gossypii under different temperatures. Five isolates of C. gossypii var. cephalosporioides and C. gossypii were incubated at 20, 25 and 30 °C. The cultural characteristics data were analyzed through ANOVA and the means compared by the Tukey test. There were differences between the isolates of the two species concerning mycelial growth and sporulation at different temperatures. Temperatures between 20 to 30 °C increased the length of conidia but did not influence the width, whereas between 25 and 30 °C, there was the highest mycelial growth. Colletotrichum gossypii expressed anthracnose symptoms, and ramulosis symptoms were observed only in plants inoculated with C. gossypii var. cephalosporioides.