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Wyświetlanie 1-15 z 23
Tytuł:
Reduction in organic matter fractions and structural stability following cultivation of tropical forests in Ethiopia and Nigeria
Autorzy:
Mbagwu, J.S.C.
Piccolo, A.
Powiązania:
https://bibliotekanauki.pl/articles/25479.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic matter
Ethiopia
tropical soil
soil
tropical forest
aggregate stability
Nigeria
Źródło:
International Agrophysics; 2004, 18, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of SLEMSA and USLE erosion models for potential erosion hazard mapping in South-Eastern Nigeria
Autorzy:
Igwe, C.A.
Akamigbo, F.O.R.
Mbagwu, J.S.C.
Powiązania:
https://bibliotekanauki.pl/articles/25180.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
USLE model
USLE mapping model
topography
cartography
SLEMSA erosion model
environment
soil erosion
USLE erosion model
Africa
SLEMSA model
Tropics,The
Nigeria
Źródło:
International Agrophysics; 1999, 13, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factorial combination of manure rates and bunch pruning intensities influenced bunch physical traits of two plantain [Musa spp. AAB] genotypes
Autorzy:
Aba, S C
Baiyeri, K.P.
Tenkouano, A.
Powiązania:
https://bibliotekanauki.pl/articles/24687.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
manure rate
bunch pruning
intensity
bunch physical trait
plantain
Musa
poultry manure
bunch yield
genotype
Źródło:
International Agrophysics; 2009, 23, 3; 207-213
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the ARP-03 for high-resolution mapping of calcic horizons
Autorzy:
Priori, S.
Fantappie, M.
Magini, S.
Costantini, E.A.C.
Powiązania:
https://bibliotekanauki.pl/articles/24650.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The aim of this work is to present a fast and cheap method for high-resolutionmapping of calcic horizons in vineyards based on geoelectrical proximal sensing. The study area, 45 ha located in southern Sicily (Italy), was characterized by an old, partially dismantled marine terrace and soils with a calcic horizon at different depths. The geoelectrical investigation consisted of a survey of the soil electrical resistivity recorded with the Automatic Resistivity Profiling-03 sensor. The electrical resistivity values at three pseudo-depths, 0-50, 0-100 and 0-170 cm, were spatialized by means of ordinary kriging. A principal component analysis of the three electrical resistivity maps was carried out. During the survey, 18 boreholes, located at different electrical resistivity values, were made for soil description and sampling. The depth to the calcic horizon showed a strong correlation with electrical resistivity. The regression model between calcic horizon and the principal component analysis factors with the highest correlation coefficients was selected to spatialise the calcic horizon values. An Normalized Difference Vegetation Index map was used to validate the calcic horizon map in terms of crop response to different soil rooting depths. The strengths of this method are the quick, non-invasive kind of survey, the relevance for vine vigour, and the high spatial resolution of the final map.
Źródło:
International Agrophysics; 2013, 27, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of some soil aggregate indices to assess potential soil loss in soils of south-eastern Nigeria
Autorzy:
Igwe, C.A.
Akamigbo, F.O.R.
Mbagwu, J.S.C.
Powiązania:
https://bibliotekanauki.pl/articles/25830.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
aggregate index
erosion
soil loss
soil erosion
texture
soil aggregate
potential
flocculation
Nigeria
Źródło:
International Agrophysics; 1995, 09, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient soil solarization for weed control in the rain-fed upland rice ecosystem
Autorzy:
Khan, A.R.
Srivastava, R.C.
Ghorai, A.K.
Singh, S.R.
Powiązania:
https://bibliotekanauki.pl/articles/25142.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
environment
soil
ground water
weed competition
crop yield
herbicide
solarization
ecosystem
rainfed upland
weed control
toxic residue
rice
Źródło:
International Agrophysics; 2003, 17, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation measurements at ICOS ecosystem stations
Autorzy:
Carrara, A.
Kolari, P.
Op the Beeck, M.
Arriga, N.
Berveiller, D.
Dengel, S.
Ibrom, A.
Merbold, L.
Rebmann, C.
SAbbatini, S.
Serrano-Ortiz, P.
Biraud, S.C.
Powiązania:
https://bibliotekanauki.pl/articles/25199.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2018, 32, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial variability of uncultivated soils in derived savanna
Autorzy:
Obalum, S.E.
Oppong, J.
Igwe, C.A.
Watanabe, Y.
Obi, M.E.
Powiązania:
https://bibliotekanauki.pl/articles/25426.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The spatial variability of some physicochemical properties of topsoils/subsoils under secondary forest, grassland fallow, and bare-soil fallow of three locations was evaluated. The data were analyzed and described using classical statistical parameters. Based on the coefficient of variation, bulk density, total porosity, 60-cm-tension moisture content, and soil pH were of low variability. Coarse and fine sand were of moderate variability. Highly variable soil properties included silt, clay, macroporosity, saturated hydraulic conductivity, organic matter concentration, and cation exchange capacity. Overall, soil pH and silt varied the least and the most, respectively. Relative weighting showed that location dominantly influenced the soil variability, except for soil porosity and organic matter concentration influenced mostly by land use. Most of the soil data were normally distributed; others were positively skewed and/or kurtotic. The minimum number of samples (at 25 samples ha-1) required to estimate mean values of soil properties was highly soil property-specific, ranging from 1 (topsoil pH-H2O) to 246 (topsoil silt). Cation exchange capacity of subsoils related fairly strongly with cation exchange capacity of topsoils (R2 = 0.63). Spatial variability data can be used to extrapolate dynamic soil properties across a derived-savanna landscape.
Źródło:
International Agrophysics; 2013, 27, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Puddling intensity for late-season sawah systems based on soil hydrophysical conditions and rice performance
Autorzy:
Obalum, S.E.
Watanabe, Y.
Igwe, C.A.
Obi, M.E.
Wakatsuki, T.
Powiązania:
https://bibliotekanauki.pl/articles/26457.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
puddling intensity
late-season sawah system
soil condition
hydrophysical condition
rice
grain yield
Oryza sativa
performance
Opis:
Lowland sawah farmers often puddle to improve soil hydrophysical conditions for rice, but the puddling intensity beyond which no extra yield increases occur is unknown. Agro- nomic effects of six mechanical puddling intensities were assessed in three Nigerian inland-valley bottoms. All puddled plots, irrespec- tive of intensity, produced similar effects at all three locations. At 10 days after transplanting, soil bulk density of all puddled plots re- presented mean decreases relative to control plots of about 22.4, 15.8, and 31.7% at Akaeze, Adani, and Ejeti, respectively. Soil bulk density and moisture content upon saturation were similar during 40-120 days after transplanting. All puddled plots consistently showed taller plants and greater tillering than control plots only at Ejeti. Grain yields were similar among treatments in Akaeze and Adani (mean, 3.71 and 6.42 Mg ha -1 , respectively), but one-pass puddling yielded numerically highest in both locations. At Ejeti, grain yields followed the trend for plant growth, with mean values of 4.36 and 1.81 Mg ha -1 for puddled and control plots, respecti- vely. One-pass puddling may be sufficient for sawah rice grown late particularly in less humid environments.
Źródło:
International Agrophysics; 2014, 28, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of shallow subsurface flow pathway networks on corn yield spatial variation under different weather and nutrient management
Autorzy:
Morgan, B.J.
Daughtry, C.S.T.
Russ, A.L.
Dulaney, W.P.
Gish, T.J.
Pachepsky, Y.A.
Powiązania:
https://bibliotekanauki.pl/articles/2082501.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
subsurface flow pathways
ground penetrating radar
geographic weighted regression
corn yield
Opis:
Ground water availability can be a major spatially variable factor of crop yields. In soils with the infiltration-restricting layer, ground water can be organized in the network of channels that conduct water laterally in wet periods and become water storage and water subsidy sources for plants in dry periods. The objective of this work was to quantify the relationships between the distances to the subsurface flow pathway network and corn yield for different weather conditions and nutrient management. Corn yield was monitored across the manured and chemically fertilized fields at the USDA-ARS OPE3 experimental site in Maryland. Data were collected during dry, normal, and above normal years in terms of the amount of precipitation from planting to physiological maturity. The subsurface flow pathway network was delineated using ArcGIS from data on topography of the infiltration-restricting layer found mostly at depths between one and three meters. The geographically weighted regression was used. Adjusted determination coefficients of regressions ranged from 0.485 to 0.655. Decrease of the adjusted determination coefficients from a dry to normal year and an increase from the normal to wet year was found. Factoring the subsurface flow pathway network influence into crop management can be an important component of precision farming strategies.
Źródło:
International Agrophysics; 2019, 33, 2; 271-276
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal stability of estimated soil water flux patterns across agricultural fields
Autorzy:
Guber, A.K.
Gish, T.J.
Pachepsky, Y.A.
van Genuchten, M.T.
Daughtry, C.S.T.
Nicholson, T.J.
Cady, R.E.
Powiązania:
https://bibliotekanauki.pl/articles/26191.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2008, 22, 3; 209-214
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of commonly used extraction methods for ergosterol in soil samples
Autorzy:
Sae-Tun, O.
Maftukhah, R.
Noller, C.
Remlinger, V.I.
Meyer-Laker, V.
Sorensen, A.C.T.
Sustic, D.
Socianu, S.I.
Bernardini, L.G.
Mentler, A.
Keiblinger, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/2082954.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil
alkaline extraction
ergosterol extraction
glass bead beating
ultrasonication extraction
Opis:
Concerning the contribution of fungi to soil carbon sequestration, various methods have been used to extract ergosterol from soil samples. This study aims to explore the extraction ability and applicability of commonly used methods to extract ergosterol from two contrasting soils. An agricultural soil (chernozem) and a forest soil (podzol) were extracted with different types of cell lysis such as alkaline, glass bead, and ultrasonication methods in association with simple shaking. The ergosterol concentration was measured by high pressure liquid chromatography. Regardless of the method applied, ergosterol yield was higher in podzol than in chernozem. Alkaline extraction resulted in the highest ergosterol concentrations for both soils and miniaturized glass bead extraction produced comparable results in the case of chernozem. In terms of applicability, the non-alkaline methods were simpler to conduct and less demanding of labour, chemical use and glassware and more flexible in terms of the equipment used for mechanical disruption. Despite the limit of the two soil types in the present study, only the simple shaking method was revealed to be dependent on soil type. Based on our results, we recommend the miniaturized glass bead method for agricultural soils, low in organic matter for high throughput. However, not all of the methods described allow for the proper separation of coextracted organic substances from organic-rich soil.
Źródło:
International Agrophysics; 2020, 34, 4; 425-432
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eddy covariance raw data processing for CO2 and energy fluxes calculation at ICOS ecosystem stations
Autorzy:
Sabbatini, S.
Mammarella, I.
Arriga, N.
Fratini, G.
Graf, A.
Hortangl, L.
Ibrom, A.
Longdoz, B.
Mauder, M.
Merbold, L.
Metzger, S.
Montagnani, L.
Pitacco, A.
Rebmann, C.
Sedlak, P.
Sugut, L.
Vitale, D.
Papale, D.
Powiązania:
https://bibliotekanauki.pl/articles/25312.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2018, 32, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring wind gradients in agroforestry systems by shaded piche evaporimeters. II. Accuracies obtained in some African case studies
Autorzy:
Stigter, C J
Kainkwa, R.M.R.
Oteng'i, S.B.B.
Onyewotu, L.O.Z.
Mohammed, A.E.
Ibrahim, A.A.
Rashidi, M.G.M.
Powiązania:
https://bibliotekanauki.pl/articles/26193.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
anemometry
Piche evaporimeter
wind reduction
agroforest system
Źródło:
International Agrophysics; 2000, 14, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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