Research in Agricultural Engineering, 2023 (vol. 69), issue 2
Evaluation of low temperature drying characteristics of fresh tea leaves (Camellia assamica) in an environmental chamber using mathematical modelsOriginal Paper
Anindita Sharma, Partha Pratim Dutta
Res. Agr. Eng., 2023, 69(2):55-64 | DOI: 10.17221/28/2021-RAE 
Low-temperature drying (withering) is the first stage in black tea processing. Determination of appropriate end moisture content of green tea leaf as well as temperature and relative humidity (RH) maintained during withering eventually aid the final quality of the processed tea. Therefore, the tea leaf withering (partial drying) properties were evaluated in an environmental chamber using mathematical models. The temperatures and RH considered were 25, 30, 35 °C and 80, 85, 90%, respectively. A total of nine combinations of temperature and RH were considered by keeping one parameter constant. The conditions were taken adhering to that of the climatic...
Comparison of the machine learning and AquaCrop models for quinoa cropsOriginal Paper
Rossy Chumbe, Stefany Silva, Yvan Garcia
Res. Agr. Eng., 2023, 69(2):65-75 | DOI: 10.17221/86/2021-RAE
One of the main causes of having low crop efficiency in Peru is the poor management of water resources; which is why the main objective of this article is to estimate the amount of irrigation water required in quinoa crops through a comparison between the machine learning and AquaCrop models. For the development of this study, meteorological data from the province of Jauja and descriptive data of quinoa crops were processed and a simulation period was established from June to December 2020. From the simulation carried out, it was determined that the best model to predict the required irrigation water is the Adaptive Boosting (AdaBoost) model in which...
Contrasting tillage systems and vertical arable layer stratification impacts on soil aggregates and root biomass in Lithuania
Inga Andru¹kaité, Vaclovas Bogu¾as
Res. Agr. Eng., 2023, 69(2):76-84 | DOI: 10.17221/29/2022-RAE
Tillage intensity can affect soil quality through soil aggregates, which are strongly associated with organic carbon. In this study, we evaluated the effect of different intensity tillage (conventional ploughing (CP), shallow ploughing (SP), deep cultivation (DC), shallow cultivation (SC), no-tillage (NT)) on soil organic carbon (SOC) and soil aggregates at the 0-5, 5-10, 10-20 and 20-30 cm layers and root biomass at the 0-10, 10-20 and 20-30 cm layers. The field experiment on spring barley (Hordeum vulgare L.) consisted of a split-plot arrangement with four replications. Dry soil aggregates were...
Field evaluation of a bent leg tillage implement in dry soil conditionsOriginal Paper
Aliakbar Solhjou, Sayed Mansor Alavimanesh
Res. Agr. Eng., 2023, 69(2):85-93 | DOI: 10.17221/41/2022-RAE
Tillage operations in dry soil conditions have increasingly been used in Iran in recent years. However, due to the recent droughts, the choice of suitable implements to reduce the clod and draught force is still under investigation. This study was aimed at determining the effect of the geometry of a bent leg tillage implement on the soil pulverisation and draught force in dry soil conditions. The treatments included three bent leg tillage depths (10, 15, and 20 cm) and three forward speeds (6, 9, and 12 km·h–1). The effect of the bent leg tillage implement on the clod mean weight diameter (MWD) and draught force was studied...
The effect of large doses of organic fertilisers on maizeOriginal Paper
Pavel Bro¾, Jaroslav Korba, Jitka Edrová, Josef Hùla, Petr ©aøec
Res. Agr. Eng., 2023, 69(2):94-100 | DOI: 10.17221/75/2022-RAE
Organic fertilisers are among the important factors increasing soil fertility. Their use belongs to sustainable technologies. As part of the field experiment, the effect of high doses of organic fertilisers on the parameters of the cultivated crop was monitored. The experiment was established using manure, compost and digestate. Monitored dosages were 40 and 200 t·ha–1. The field trial was based on a light cambisoil. The cultivated crop was maize. A blade cultivator was used in all cases to incorporate fertilisers. The qualitative parameters of the fertilisers were evaluated, as well as the maize yield and the quality of the resulting...
Influence of primary tillage on the displacement of soil particlesOriginal Paper
Pavel Bro¾, Josef Hùla
Res. Agr. Eng., 2023, 69(2):101-106 | DOI: 10.17221/76/2022-RAE
The loss of soil particles due to erosion is one of the main problems of current agriculture. However, soil tillage may also contribute to the undesirable transport of soil particles. It is to note that the effects of particular working elements used on implements for soil tillage have not been described in a sufficient way. To determine the translocation of soil particles, measurements were done in the Central Bohemian region. Two basic machines for soil tillage were used for measurements: a disc harrow and a tine cultivator. Measurements were performed on sandy-loamy Cambisol after the harvest of a spring cereal crop. White limestone grit was...