Wyniki wyszukiwania - Biblioteka Nauki

1

Comment on water potential definition

100%

Sobczuk H. A.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1996

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tom 436

EN

The definition of soil water potential is based on the chemical potential of homogeneous medium. The assumption of homogeneity causes many difficulties to arise when such a definition is used for the description of highly heterogeneous soil medium. Another aspect discussed here is the basic of division of a soil water potential onto additive parts (pressure, gravitational, thermal etc.). It has been shown here that this division can be done when only one parameter of state changes, otherwise it is only approximation with possibly high error.

PL

Definicja potencjału wody glebowej oparta jest na rozumowaniu termodynamicznym dotyczącym ośrodka jednorodnego. W pracy pokazano niektóre konsekwencje pominięcia faktu że ośrodek glebowy jest heterogeniczny. Wskazano również te podział całkowitego potencjału wody glebowej na części jest przybliżeniem które może prowadzić do błędów w przypadku rozpatrywania przemian termodynamicznych wody glebowej przebiegających ze zmianą więcej niż jednego parametru stanu.

2

Verification of the Van Genuchten method of determination of the hydraulic conductivity of peat soils

100%

Olszta W. , Kowalski D.

International Agrophysics

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1996

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tom 10

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nr 2

3

Predicting the soil water retention curve from readily - available data obtained during soil surveys

100%

Simota C. , Mayr T.

International Agrophysics

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1996

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tom 10

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nr 3

4

Assessment of permeability and pore water pressure in Warsaw clays based on in situ measurements

75%

Skutnik Z.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2011

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tom 43

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nr 2

5

A measurement of the evapotranspiration under alfalfa by the gradients of the energy and quantity of soil water

75%

Doneva E. , Shopski N.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Melioracja

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1990

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nr 35

6

Water productivity under deficit irrigation using onion as indicator crop

75%

Tadesse K. B. , Hagos E. Y. , Tafesse N. T. , Dinka M. O. , Tadesse K. B. , Hagos E. Y. , Tafesse N. T. , Dinka M. O.

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7

Water for landscape or landscape for water

75%

Jurik L. , Huska D. , Tatosova L. , Bazso R.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2008

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tom 532

EN

At present time there are materialized simultaneously two viable tasks in the area of water management in the European Union countries. The first is the realization of the tasks given in Water Framework Directive and the second one is the task of the process of evaluation and strategy of the expected inevitable climatic changes. The realization output of the first task will be presented by the water management plans which are being prepared and which are going to take into consideration influence of the climate changes on the water resources or the water balance in the catchment. On that account the balance of really measured and recorded data from the last ten years can evidently help to judge possible hydrologic cycle and balance of water management in the further decades. Taking everything this into consideration we are able to assess the role and responsibility of the participants in the balance of requirements to maintain sustainable water exploitation in the catchment areas in Slovakia in the period of time from 1995-2005.

PL

Przed gospodarką wodną krajów Unii Europejskiej pojawiły się dwa realne zadania. Pierwsze z nich dotyczy wdrażania Ramowej Dyrektywy Wodnej, a drugie jest związane z procesem przewidywanych nieuchronnych zmian klimatycznych. Pierwsze zadania będzie realizowane w ramach przygotowywanych planów gospodarowania wodą, które będą uwzględniały wpływ zmian klimatycznych na zasoby wodne i bilans wodny w zlewni. W tej ocenie rzeczywiste pomiary i zarejestrowane dane z ostatnich 10 lat mogą wydatnie pomóc ocenić możliwy hydrologiczny cykl i bilans zarządzania wodą w następnych dekadach. Biorąc to wszystko pod uwagę, jesteśmy w stanie ocenić rolę i odpowiedzialność użytkowników w bilansie zapotrzebowania na wodę przy stałym jej zużyciu w zlewniach na terenie Słowacji w okresie od 1995-2005.

8

The influence of soil acidity on aluminium and mineral nutrients concentrations in soil solution at different soil water potentials

75%

Siecinska J. , Wiacek D. , Nosalewicz A.

Acta Agrophysica

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2016

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tom 23

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nr 1

EN

The aim of the research was to analyse the impact of soil water potential on the concentration of aluminium and selected mineral nutrients in soil solution. Soil acidification is a natural process accelerated by agriculture, and one of the most important factors limiting crop production worldwide. Concentrations of aluminium and selected mineral nutrients in solutions obtained from soil at initial pH 4.2 and after liming at various soil water potential were measured in centrifuged soil solution. Our results showed a significant gradual increase in the concentration of Al and most of mineral nutrients (Ca, Mg and P) with decreasing soil water potential from −3.5 kPa to −0.205 MPa. The results are important in the evaluation and interpretation of plant response to aluminium toxicity when accompanied by changes in water availability.

PL

Celem badań była analiza wpływu potencjału wody glebowej na stężenie glinu i wybranych składników mineralnych w roztworze glebowym gleby kwaśnej i wapnowanej. Wzrost kwasowości gleb jest naturalnym procesem, jednym z najważniejszych czynników ograniczających produkcję roślinną na świecie. Może on ulec przyspieszeniu przez środki stosowane w rolnictwie. Pomiarami objęto zmiany stężenia glinu oraz wybranych składników mineralnych w roztworach glebowych z gleby o pH 4.2 oraz gleby wapnowanej, otrzymanych przy różnych potencjałach wody glebowej. Nasze wyniki wskazują na znaczący wzrost stężenia glinu i większości składników mineralnych (Ca, Mg i P) wraz ze spadkiem potencjału wody glebowej z −3.5 kPa do – 0.205 MPa. Uzyskane wyniki są ważne w ocenie i interpretacji odpowiedzi roślin na toksyczność glinu, w warunkach zróżnicowanego uwilgotnienia gleby.

9

Spatial and temporal variability of soil water content

75%

Oyedele D. J. , Tijani F. O.

International Agrophysics

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2010

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tom 24

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nr 2

171-176

10

Water productivity under deficit irrigation using onion as indicator crop

75%

Tadesse K. B. , Hagos E. Y. , Tafesse N. T. , Dinka M. O.

Journal of Water and Land Development

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2020

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tom no. 45

171--178

EN

Improving water productivity (WP) through deficit irrigation is crucial in water-scarce areas. To practice deficit irrigation, the optimum level of water deficit that maximizes WP must be investigated. In this study, a field experiment was conducted to examine WP of the three treatments at available soil water depletion percentage (Pi) of 25% (reference), 45% and 65% using a drip irrigation system. Treatments were arranged in a randomized complete block design. The water deficit was allowed throughout the growth stages after transplanting except for the first 15 days of equal amounts of irrigations during the initial growth stage and 20 days enough spring season rainfall during bulb enlargement periods. Physical WP in terms of water use efficiency (WUEf) for treatments T1, T2, and T3 was 9.44 kg∙m–3, 11 kg∙m–3 and 10.6 kg∙m–3 for marketable yields. The WUEf and economic water productivity were significantly improved by T2 and T3. The WUEf difference between T2 and T3 was insignificant. However, T2 can be selected as an optimal irrigation level. Hence, deficit irrigation scheduling is an important approach for maximizing WP in areas where water is the main constraint for crop production. The planting dates should be scheduled such that the peak water requirement periods coincide with the rainy system.

11

Error analysis of water conductivity coefficient measurement by instantaneous profiles method

75%

Slawinski C. , Walczak R. T. , Skierucha W.

International Agrophysics

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2006

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tom 20

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nr 1

12

Model of soil water hysteresis based on pore space geometry

75%

Kaszubkiewicz J.

Polish Journal of Soil Science

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1997

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tom 30

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nr 1

13

Measurement of water characteristics in soils using TDR technique: water characteristics of loess soil under different treatment

75%

Walczak R. T. , Slawinski C. , Malicki M. , Sobczuk H.

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nr 2-3

14

Soil moisture and bulk electrical conductivity variability measured by TDR

75%

Sobczuk H. A. , Zhixiong C. , Liuzong Z.

International Agrophysics

|

1996

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tom 10

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nr 4

15

Influence of a rootstock on transpiration rate and changes in diameter of an apple tree leader growing under different soil water regimes

75%

Klamkowski K. , Treder W.

Journal of Fruit and Ornamental Plant Research

|

2002

|

tom 10

16

Relationship between the impedance of a multi-pin probe and soil water content

75%

Sun Y. , Kromer K. H.

International Agrophysics

|

2003

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tom 17

|

nr 1

17

Indices of shape in the classification of soil structure

75%

Bryk M.

Polish Journal of Soil Science

|

2004

|

tom 37

|

nr 1

EN

The aim of the study was to examine the usefulness of simple pore shape indices for the classification of soil structure with respect to two main groups of soil macropores (fissures and cavities). The samples were taken from various soils of SE Poland: Mollic and Eutric Leptosols, Eutric Regosol, Haplic Phaeozem, Haplic and Stagnic Luvisols, and Sapric Histosol. The research was performed on 81 polished blocks using image analysis. First, the soil samples were classified into five structural groups: mixed, fissure, nearly fissure, cavity and nearly cavity. Morphometrical analysis provided shape indices CIRav, ELGav, and their coefficients of variation V(CIR), V(ELG). They enabled the group of fissure structures to be distinguished from the groups of mixed, cavity and nearly cavity structures. The research may contribute to the creation of an objective method for recognising soil structure in respect to the main soil structure types: mixed (fissure-cavity), fissure and cavity structures.

18

The use of neural networks in studying the outflow from drainage pipelines

75%

Reinhard T. , Reinhard A.

Journal of Water and Land Development

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2005

|

nr 09

19

Soil tensile strength as affected by time, water content and bulk density

75%

Blazejczak D. , Horn R. , Pytka J.

|

1995

|

tom 09

|

nr 3

20

Residue management and paratillage effects on water conservation and grain yield of great plains drylands

75%

Jones O. R.

|

1997

|

tom 2A