bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interpreting the slope of a straight line in kinematics graphs with school students
Authors: Prada Núñez R , Gamboa Suárez A A , Avendaño Castro W R 
Published: January 2022

Abstract
The interdisciplinary nature of knowledge is one of the objectives promoted in Colombia, fostering in students the ability to recognize that the curriculum does not work in isolation; if knowledge is complementary, its joint development leads to better academic performance. This research is oriented towards showing an application of the mathematical concept of the slope of the straight line in physics applications, favoring the understanding of the relationships between variables, as occurs with the graphs of kinematics. A group of eleventh grade students from a private educational institution filled in a questionnaire for data collection, based on three situations proposed to answer three open questions in which a reasonably justified answer was required. A part of the group correctly interpreted the graphs by describing the characteristics of the movement in each time interval, but only a few were able to associate the slope of the line as the velocity or acceleration as a function of the variables mentioned in the graph, although their argumentation was based on the angle of elevation of the line.
Effect of elevated tropospheric ozone on soil carbon and nitrogen: a meta-analysis
Authors: Hu Enzhu , Ren Zhimin , Wang Xiaoke , Zhang Hongxing , Zhang Weiwei 
Published: January 2022

Abstract
Elevated tropospheric ozone concentration ([O3]) may substantially influence the belowground processes of the terrestrial ecosystem. Nevertheless, a comprehensive and quantitative understanding of the responses of soil C and N dynamics to elevated [O3] remains elusive. In this study, the results of 41 peer-reviewed studies were synthesized using meta-analytic techniques, to quantify the impact of O3 on ten variables associated with soil C and N, i.e. total C (TC, including soil organic C), total N (TN), dissolved organic C (DOC), ammonia N (NH4
+), nitrate N (NO3
−), microbial biomass C (MBC) and N (MBN), rates of nitrification (NTF) and denitrification (DNF), as well as C/N ratio. The results depicted that all these variables showed significant changes (P < 0.05) with [O3] increased by 27.6 ± 18.7 nl l−1 (mean ± SD), including decreases in TC, DOC, TN, NH4
+, MBC, MBN and NTF, and increases in C/N, NO3
− and DNF. The effect sizes of TN, NTF, and DNF were significantly correlated with O3 fumigation levels and experimental duration (P < 0.05). Soil pH and climate were essential in analyses of O3 impacts on soil C and N. However, the responses of most variables to elevated [O3] were generally independent of the O3 fumigation method, terrestrial ecosystem type, and additional [CO2] exposure. The altered soil C and N dynamics under elevated [O3] may reduce its C sink capacity, and change soil N availability and thus, impact plant growth and enhance soil N losses.
Impacts of 319 wind farms on surface temperature and vegetation in the United States
Authors: Qin Yingzuo , Li Yan , Xu Ru , Hou Chengcheng , Armstrong Alona , Bach Eviatar , Wang Yang , Fu Bojie 
Published: January 2022

Abstract
The development of wind energy is essential for decarbonizing energy production. However, the construction of wind farms changes land surface temperature (LST) and vegetation by modifying land surface properties and disturbing land–atmosphere interactions. In this study, we used moderate resolution imaging spectroradiometer satellite data to quantify the impacts on local climate and vegetation of 319 wind farms in the United States. Our results indicated insignificant impacts on LST during the daytime but significant warming of 0.10 °C of annual mean nighttime LST averaged over all wind farms, and 0.36 °C for those 61% wind farms with warming. The nighttime LST impacts exhibited seasonal variations, with stronger warming in winter and autumn, up to 0.18 °C, but weaker effects in summer and spring. We observed a decrease in peak normalized difference vegetation index (NDVI) for 59% of wind farms due to infrastructure construction, with an average reduction of 0.0067 compared to non-wind farm areas. The impacts of wind farms depended on wind farm size, with winter LST impacts for large and small wind farms ranging from 0.21 °C to 0.14 °C, and peak NDVI impacts ranging from −0.009 to −0.006. The LST impacts declined with the increasing distance from the wind farm, with detectable impacts up to 10 km. In contrast, the vegetation impacts on NDVI were only evident within the wind farm locations. Wind farms built in grassland and cropland showed larger warming effects but weaker vegetation impact than those built on forests. Furthermore, spatial correlation analyses with environmental factors suggest limited geographical controls on the heterogeneous wind farm impacts and highlight the important role of local factors. Our analyses based on a large sample offer new evidence for wind farm impacts with improved representativeness compared to previous studies. This knowledge is important to fully understand the climatic and environmental implications of energy system decarbonization.
Seaweed extract effect on arbuscular mycorrhizae spore in soil engineered by earthworm, and the soil effect on upland rice growth
Authors: Kilowasid L M H , Ariansyah R , Afa L , Sutariati G A K , Namriah  , Rakian T C , Sanjaya M F , Hisein W S A 
Published: January 2022

Abstract
Seaweed extract is known to contain nutrients and growth-regulating substances that affect soil biota, and a source of protection against pests and diseases. Earthworm, which is an example of a soil biota and playing the role of ecosystem engineer, has the ability to produce suitable land biostructures, for the inhabitation of arbuscular mycorrhizal fungi (AMF), which has an impact on upland rice growth. Therefore, this study aims to determine, (i) the effect of seaweed extract on the population of earthworms and spores of arbuscular mycorrhizal fungi, and (ii) the impact of the engineered soil on the growth of local upland rice varieties. Furthermore, the extract of seaweed, such as Kappapychus alvarezii, was divided into five concentration levels, namely 0%, 20%, 40%, 60%, and 80%. Each treatment was drenched into the soil from the cogongrass vegetated area, mixed with 20 Pheretima sp., and maintained for 49 days in the greenhouse. The result showed that the total difference in the earthworms’ concentration treatments was not significant. It also showed that the total AMF spores in the engineered soil products of 20% concentration was the highest. Based on treatment with the earthworm engineered soil products, the highest and lowest vegetative growth and yield components of upland rice were observed at the concentrations of 80% and 0%, respectively. In conclusion, the application of seaweed extract to the soil did not significantly reduce the earthworm population. The extract concentration of 20% also increased the total AMF spore in the engineered soil. Moreover, highly treated engineered soil products increased the growth and yield components of upland Kambowa rice on cogongrass soils.
The effect of synbiotic through feed and drinking water on growth performance and nutrient digestibility of Tegal duck
Authors: Mangisah I , Suthama N 
Published: January 2022

Abstract
Synbiotics are a combination of probiotics and prebiotics that have a positive effect on livestock performance. The method of giving synbiotics as a growth supplement needs to be studied to get the best results. This study aimed to investigate the effect of administering synbiotic (a mixture of Lactobacillus casei and porang tuber extracts (LCPE) in water or as feed supplement on performance and nutrient digestibility of Tegal duck. The research used a total number of 240-day old ducks with an average body weight of 47.84 ± 6.32 g. The ducks were weighed and distributed into 24 groups. Two experiments (I and II) were carried out simultaneously in the same cage and time. Each experiment used 120 ducks. Ducks were adapted from the age of 1 to 14 days. Parameter data were measure in ducks aged 15 to 42 days. Trial I included 3 groups of dietary synbiotic (0, 10, 20 ml/kg) through feed, while In trial II, the ducks were fed synbiotics (0; 10; 20 ml/L) through water drinking for four weeks. The observed variables included growth performance and nutrient digestibility. The mixture of Lactobacillus casei and glucomannan from porang tuber extract improved nutrient digestibility and duck performance. The best performance and nutrient digestibility is LCPE 20 ml/L drinking water.
Chemical and sensory properties of analogue rice based on kimpul flour (Xanthosoma sagitifolium)
Authors: Noviasari S , Assyifa P S , Sulaiman I 
Published: January 2022

AbstractAnalog rice is artificial rice shaped like rice grains made from non-rice carbohydrate-rich flour with water, which can overcome food security in Indonesia. Taro kimpul is a local food rich in carbohydrates that cannot be widely used. Therefore, kimpul thread has the potential to be used as raw material in the manufacture of analog rice. This study aimed to determine the chemical characteristics of kimpul taro analog rice with dyes and binders. In addition, it is expected to increase consumer acceptance based on sensory testing. This research method uses an experimental laboratory method by making analog rice with 4 formulations. The analysis was water content, ash content, protein content, fat content, carbohydrate content, and sensory (hedonic) analysis, including colour, taste, texture, and overall aroma. The results showed that analog rice A was the best formula selected using the Bayes method based on the results of chemical and hedonic tests. Chemical and sensory characteristics of analog rice A with the use of 4% CMC and 32% beet are as follows moisture 2.88%; ash 2.3%; fat 1.1%; 5.7% protein; carbohydrate 87.94% and a preference value with an average range of neutral-good.
Antagonistic screening of Trichoderma spp. isolated from patchouli rhizosphere
Authors: Muzakir  , Hifnalisa  , Jauharlina J. , Sriwati Rina 
Published: January 2022

Abstract
The objective of this research was to determine the antagonistic activity of Trichoderma spp. isolated from patchouli rhizosphere (Pogostemon cablin Benth.). Another objective was to perform antagonistic screening of these fungi to inhibit the growth of the wilted pathogen Fusarium spp. In vitro research was conducted in the Laboratory of Plant Pathology, Universitas Syiah Kuala, from January to June 2020. The study used a completely randomised design with five treatments and three replications. The antagonistic screening was carried out by using the dual culture method of Trichoderma spp. against Fusarium spp. with the medium of Potato Dextrose Agar (PDA). The result showed that five isolates of Trichoderma have different antagonistic percentages in inhibiting the Fusarium. The highest antagonistic activity was found from isolate 2 and the lowest value was shown by isolate 3.
Embryo development of hatching eggs of superior local broiler (ALPU) with Arab native chickens (Kamaras)
Authors: Azim M , Tarman A , Abdullah M A N , Yaman M A 
Published: January 2022

AbstractEfforts to improve the quality of local chickens, especially free-range chickens, are carried out by improving genetic traits, namely through a strict selection method to produce broilers with the name of Superior Local Broilers (ALPU) and laying purposes with Arab Kampung Chickens (Kamaras). This study was conducted to obtain information on the comparison of ALPU and Kamaras embryo development for genetic improvement as the basis for further research. This study used 105 ALPU hatching eggs and 105 Kamaras hatching eggs, the observations were carried out for 21 days. Eggs were collected for 7 days and then put into the incubator, then observed every day by breaking each 5 ALPU and Kamaras eggs to see 7 parameters of embryo development in the form of: body weight, body length, head circumference, neck length, beak length, wing length and leg length. The results showed that there was no significant developmental difference between ALPU and Kamaras embryos. However, the embryo weight and beak length of Kamaras tended to be larger than those of ALPU, while the head circumference and wing length of ALPU tended to be larger than that of Kamaras. In conclusion, the embryonic development between ALPU and Kamaras showed relatively similar embryo development during the hatching period.
Analysis of the suitability of rice farming land as an opportunity for determining the agricultural planting calendar in Ajibarang District, Banyumas Regency, Central Java Province
Authors: Zid M , Handawati R , Wulandari N A F 
Published: January 2022

Abstract
Ajibarang District is one of the areas in Banyumas Regency with a high level of productivity, but the decrease in rainfall in 2017-2019 caused Ajibarang District to have difficulty in developing their agriculture so that farmers experienced crop failure. The impact that occurs from crop failure causes the land to not be cultivated and if it is cultivated, farmers plant secondary crops. It is also greatly influenced by climate change that occurs. In fact, Ajibarang Subdistrict is included in the B2 Climate Zone with an average rainfall of 1000 - 2000 mm/year which is a climate zone business. The purpose of this study was to determine the opportunities for the rice planting that is very suitable for rice farming. In addition, the Ajibarang Sub-district is also drained by a large river, namely the Serayu River and the Tajum River which are tributaries of the river. So, it is necessary to adjust the climate to be able to determine a suitable planting calendar for agricultural calendar in Ajibarang District. Method The research used is the Forward Sampling and Backward Sampling analysis methods. So, the results of this study resulted in a rice and secondary cropping calendar with three planting seasons in one year and two dry seasons in one year.
Analysis of farmers’ perceptions of the rice farming AUTP program in Landak Regency
Authors: Ellyta Ellyta , Ekawati  , Rizieq R , Anggreni M A 
Published: January 2022

Abstract
Farmers in Landak Regency more frequently face uncertainty and risk of rice farming failure. Therefore, a program that can protect the farmers from the risk is required. Rice farming business insurance (AUTP) is an alternative to overcome the risk of loss due to crop failures. The limited information and knowledge of farmers regarding the AUTP have led to different perceptions among farmers and have affected the farmers’ enthusiasm to become the insurance participants. This research aimed to analyse the farmers’ perceptions of the AUTP program and its implementation mechanisms in Sengah Temila Subdistrict, Landak Regency. A descriptive method with Likert scale was used to analyse the farmers’ perceptions. The research results show that the farmers’ perceptions are at high category with the total score of 3048, indicating that they agree with the AUTP; the highest indicator (195) was that the program objective is protecting the farmers from crop failures, and the lowest indicator (153) was that the program gets success when the farmers agree to pay the insurance premium fully. In general, the implementation of the AUTP in Landak Regency was in accordance with the 2018 AUTP Premium Assistance Guidelines.
Surface morphology properties of biochar feedstock for soil amendment
Authors: Zaitun Z , Halim A , Sa’dah Y , Cahyadi R 
Published: January 2022

Abstract
A soil amendment is any material added to a soil to improve soil physical properties, support plant growth, improve soil fertility, organic matter, and water holding capacity, improve soil chemical and biological properties. Biochar is an organic amendment that improve soil fertility, mitigates climate change, and effectively keeps nutrients and available to plants. The chemical and physical properties of the biochar are important to know the suitable applications of biochar. The chemical and physical properties of the biochar are depending on the process and biomass feedstock. The research aimed to find out the kind of biomass feedstock for biochar as a soil amendment. The biochar feedstock was evaluated using scanning electron microscopy (SEM) and electron dispersive X-ray (EDX) analysis and can predicting possible uses for the biochars. The result showed that the biochar surface morphology properties were influenced by the feedstock types and pyrolysis temperature. The pores development and mineral contents in coconut shell biochar are the most suitable for soil amendment.
Improving the sustainability of cocoa smallholders farming in Aceh, Indonesia
Authors: Iskandar E , Amanah S , Hubeis AVS , Sadono D , Ginting LN , Mujiburrahmad  
Published: January 2022

Abstract
Cocoa is the main plantation commodity in Aceh as Aceh government reinforces Aceh as the national cocoa resource. Various efforts have been performed through many development and training programs for sustainable cocoa production. This study was aimed to identify the sustainability of cocoa smallholder farming based on the ecological, economical, and social aspects. This study was conducted in Aceh Tenggara and Pidie Jaya District. The study method used descriptive-quantitative method by calculating the score range of sustainability level. The result showed that cocoa smallholders challenged sustainability problems based on ecological, economical, and social aspects. The sustainability of cocoa smallholder farming in Aceh Tenggara District achieves a better performance based on the economical, ecological, and social sustainability aspects than in Pidie Jaya District.
Analysis of factors influencing Thai rice trade based on Gravity model
Authors: Yusiana E , Hakim D B , Syaukat Y , Novianti T 
Published: January 2022

Abstract
The purpose of this study is to analyse what factors influencing Thai rice export including importers’ GDP, exporters of GDP, distance of the countries, international rice prices, production and exchange rates by using the gravity model approach. The results show that the factors that influence rice exports in Thailand include the GDP of the importing country, the GDP of the exporting country, distance, international rice prices, production and the real exchange rate. Factors that have positive coefficients are importers’ GDP and real exchange rates, while those with negative coefficients are exporters’ GDP, rice prices, production and distance. Positive coefficients include importer’s GDP and Real Exchange Rate. The GDP of the importing country has a positive coefficient of 0.73 and the real exchange rate or RER (Real Exchange Rate) has a positive coefficient of 0.73. In addition, the negative coefficient values include exporters’ GDP, rice prices, production and distance. The exporting country’s GDP has a negative coefficient of 0.98, prices have a negative coefficient of 1.37 and production has a negative coefficient of 0.23 and distance has a negative coefficient of 0.3.
The effects of heavy metal exposure in agriculture soil on chlorophyll content of agriculture crops: A meta-analysis approach
Authors: Hananingtyas I , Nuryanty C D , Karlinasari L , Alikodra H S , Jayanegara A , Sumantri A 
Published: January 2022

Abstract
Soil can be contaminated by the accumulation of heavy metals and metalloids through emissions from rapidly developing industrial areas. Due to the possibility of chemical change (speciation) and their bioavailability, the presence of toxic metals in the soil can greatly inhibit the biodegradation of organic contaminants. The researchers aimed to analyse the effect of heavy metal levels in agricultural soil on chlorophyll levels in agricultural crops through a meta-analysis method which is expected to provide results in the form of a summary of data that already exists in journals that have been published so far. Here we present a meta-analysis of 6 studies (56 data collected) published between 1997 and 2020 that reported the effects of heavy metal content on plant chlorophyll content. Based on the meta-analysis of the effect of heavy metal exposure in agricultural soil on the chlorophyll content of agricultural crops, the value “effect size overall” was -0.285 in the range of -0.380 to -0.190, where most of the values “effect size” were on the left. Plants growing on soil contaminated with heavy metals result in decreased growth due to changes in physiological and biochemical activities, especially when heavy metals inhibit plant growth and development. Furthermore, environmental risk assessment due to mercury exposure is very important to control the transport and accumulation of mercury in the biosphere to reduce the impact of mercury on the environment.
High Density Polyethylene (HDPE) composite mixed with Azadirachta excelsa (Sentang) tree waste flour: Mechanical and physical properties
Authors: Zakaria A M , Jamaludin M A , Zakaria M N , Hassan R , Bahari S A 
Published: January 2022

Abstract
This article presents the application of plantation waste materials (leaves, branches and trunks) of Azadirachta excelsa (Sentang) tree in order to evaluate and compare their suitability as reinforcement and filler for high density polyethylene (HDPE) thermoplastics. The aim of the study was to investigate the effect of different types of Azadirachta excelsa (Sentang) trunks flour, branches flour and leaves flour fillers on the mechanical and physical properties of HDPE composite. The composite samples were produced using 25%, 35% and 45% by weight of flour filler loading and 2% coupling agent (maleic anhydride) using a twin-screw extruder, followed by injection molding process. The flexural modulus and tensile strength of the composite filled with trunk flour were not significantly different with the composite-filled branch flour. However, there is a significant difference between composite-filled leaf flour when compared to both composite-filled trunk flour and composite-filled branch flours. Overall, composite samples with trunk flour show better mechanical properties, while composite samples with lower filler loadings of 25% exhibit better dimensional stability compared to the other such as 35% and 45% filler loadings. The study also indicated that composite filled with leaf, branch and trunk flours had better mechanical strength than virgin HDPE.
The effect of Co-60 gamma rays irradiation on chemical properties of biofertilizer carrier material
Authors: Bachtiar T , Anas I , Sutandi A , Ishak  
Published: January 2022

Abstract
This study was conducted to test the method of sterilization using autoclave and Co-60 gamma rays irradiation on chemical properties changes of biofertilizer carriers (Jasinga Latosols, Pasar Jumat Latosols, compost, Rawa Pening peat, Kalimantan peat). This research was conducted in July 2016 to April 2017 at Center for the Application of Isotopes and Radiation National Nuclear Energy Agency (PAIR BATAN) laboratory and Ilmu Tanah Sumber Daya Lahan Insitut Pertanian Bogor (IPB) laboratory. The design used in this study is completely randomized design, with seven treatment and five replications. The treatments provided include the control (without sterilization), sterilization using autoclave, and sterilization using gamma ray of Co-60 with doses of 10 kilo Gray (kGy), 20 kGy, 30 kGy, 40 kGy and 50 kGy. The parameters observed in this research was available Mn2+, available Fe2+, available Zn2+, and effectiveness of sterilization method. This research also showed chemical character changes in materials as shown by Fouier-Transform Infrared Spectrometer (FTIR) spectra. The results showed that the methods sterilization was gave significant effect on pH changes, the levels of available P, the levels of available nitrates, available Mn2+, available Fe2+, and available Zn2+. Autoclave has led to a higher metal increase compared to Co-60 gamma irradiation. A dose of 30 kGy is an effective dose to sterilize the carriers material.