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    Wyświetlanie 1-4 z 4
    Tytuł:
    Distribution of soil water and nitrate in furrow irrigation under different plastic mulch placement conditions for a maize crop: Field and modelling study
    Autorzy:
    Pahlevani, A.
    Ebrahimian, H.
    Abbasi, F.
    Fujimaki, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083092.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    furrow fertigation
    plastic mulch
    maize
    HYDRUS-2D
    dryland
    Opis:
    The use of plastic mulch in furrow irrigation increases irrigation efficiency and improves crop yield. In this study, the effect of the placement of plastic mulch on the furrows and/or on the ridges on reducing water loss and nitrate leaching for furrow-fertigated maize was investigated. Field experiments were carried out including four different treatments which differed according to the placement of plastic mulch on a clay loam soil: plastic mulch on the ridge, plastic mulch on the furrow bed, plastic mulch on the ridge and the furrow bed and control treatment without the mulch. The HYDRUS-2D model was used to simulate water movement and nitrate transfer within the soil. The HYDRUS-2D model was well calibrated and validated using field data. Three irrigation scenarios were also compared including 125, 100 and 75% of the crop water requirement. In the case of using mulch and full irrigation (i.e. 100% crop water requirement), nitrate losses compared to the control treatment with 25% over-irrigation decreased by 52, 44, and 30%, in the the treatments of mulch on the furrow bed, mulch on the ridge and mulch on the ridge and the furrow bed, respectively. Deep percolation of irrigation water also decreased by 53, 48, and 41%, respectively. The use of plastic mulch on the furrow bed with less irrigation depth could be used to prevent water and nitrate losses in furrow irrigation.
    Źródło:
    International Agrophysics; 2021, 35, 2; 131-144
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Soil Degradation Based on Soil Properties and Spatial Analysis in Dryland Farming
    Autorzy:
    Kartini, Ni Luh
    Saifulloh, Moh
    Trigunasih, Ni Made
    Narka, I. Wayan
    Powiązania:
    https://bibliotekanauki.pl/articles/24201759.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    soil degradation
    geographic information system
    dryland farming
    soil properties
    Opis:
    Dryland farming, managed intensively, with the input of chemical fertilizers exceeding the dose threshold, can cause soil degradation. Degraded soil affects low environmental carrying capacity and soil and water conservation. Researchers conduct soil tests on agricultural land to address this issue, especially those that apply a continuous cropping system. This study aimed to examine soil properties to determine the conditions of soil degradation in dryland farming. The method integrates spatial analysis with Geographic Information Systems (GIS), field surveys, and laboratory soil samples analysis. The spatial data used to map the potential for soil degradation includes land use, slope, rainfall, and soil type. Integrating spatial and laboratory data, such as soil physical, chemical, and biological properties results in soil degradation status conditions representing the actual conditions in the field. This study found that there were three classes of soil degradation successively, namely mild, moderate, and high. There are two statuses of soil degradation, including non-degraded and light soil degradation status. The soils with a mild degree of degradation are due to the limiting factors of permeability, fractional composition, and total porosity. Some actions that can be taken include planning soil degradation prevention measures by utilizing soil degradation potential maps that have been made for areas with high soil degradation potential. For the sites with a status of soil degradation, efforts are made to start carrying out soil improvement actions in accordance with conservation principles to reduce the soil degradation that occurs. Moreover, organic matter is added to degraded and potentially degraded soils to increase the stability of soil aggregates and water-carrying capacity.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 368--375
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Whitmore Point Member of the Moenave Formation: Early Jurassic Dryland Lakes on the Colorado Plateau, Southwestern USA
    Autorzy:
    Tanner, L.
    Lucas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061348.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Utah
    Arizona
    Hettangian
    Moenave Formation
    meromictic
    dryland
    perennia
    ephemeral
    lacustrine
    Opis:
    The Lower Jurassic Whitmore Point Member of the Moenave Formation in Arizona-Utah, USA, comprises fish- and coprolite-bearing shales, siltstones, sandstones, and minor limestones. These facies were deposited in ephemeral and perennial lakes subject to episodic desiccation and incursions of coarse clastics during floods. Meromictic conditions developed during perennial episodes, probably due to salinity stratification, which enhanced preservation of organic matter in gray to black shales. These lakes formed on the floodout of a north-northwest oriented (relative to modern geography) system of mainly ephemeral streams on a broad and open floodplain. The Whitmore Point Member both overlies and interfingers laterally with alluvial red-bed facies of the Dinosaur Canyon Member of the Moenave Formation. The vertical transition from alluvial to lacustrine sedimentation recorded by the Dinosaur Canyon and Whitmore Point members of the Moenave Formation most probably resulted from a eustatically-controlled rise in base level during the Early Jurassic (Hettangian). The Dinosaur Canyon Member also interfingers laterally with eolian dune deposits of the Wingate Sandstone, which was deposited by winds that reworked coastal plain sediments to the north of the study area. Thus, on this part of the Colorado Plateau, fluvial, lacustrine and eolian sedimentary facies were deposited contemporaneously in laterally adjacent paleoenvironments.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 11-21
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Issues of conventional model of transfer of latent heat in soil
    Autorzy:
    Sakaguchi, Iwao
    Mochizuki, Hidetoshi
    Katayama, Arata
    Momose, Toshihiko
    Fujimaki, Haruyuki
    Powiązania:
    https://bibliotekanauki.pl/articles/973100.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    : latent heat transfer
    conventional model
    experimental coefficient
    temperature gradient
    dryland
    Opis:
    Upper limit of experimental coefficient between the measured transfer of latent heat and the estimated vapour flux in the frame of the conventional model of latent heat transfer in soil was examined by analysing the measured latent heat transfer and temperature gradient in soil under steady-state temperature gradient. To exclude the temperature gradient as an uncertainty factor from the experimental coefficient, the temperature gradients of overall soil and soil pore were included into the vapour fluxes in the atmosphere. The estimated experimental coefficient did not exceed unity, which indicated that both the latent heat transfer and the vapour fluxes in the soil were smaller than those in the atmosphere. The gap that appeared between the experimental coefficient and the product of the tortuosity factor and air-filled porosity implied the existence of an unidentified parameter relevant to characteristic of the circulation of water in soil which is the main mechanism of latent heat transfer in soil. By quantifying this characteristic with simultaneous measurements of the latent heat transfer, distributions of temperature, water content and solute content in various soils under the steady-state condition, the conventional model would be modified, or an alternative model being independent of the conventional model would be developed.
    Źródło:
    International Agrophysics; 2017, 31, 2; 303-306
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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