Technical Bulletin. An integrated model approach to the effect of water management on crop yield / Feddes, R. A.

Public ISBD Titre de série : Technical Bulletin Titre : An integrated model approach to the effect of water management on crop yield Type de document : texte imprimé Auteurs : Feddes, R. A. ; Wijk, A. L. M. (van) Mention d'édition : ILWMR IVCW Editeur : ILWMR IVCW Année de publication : 1977 ISBN/ISSN/EAN : CI-09440 Note générale : Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil. Langues : Anglais (eng) Mots-clés : Agriculture  Récolte  Drainage  Modèle mathématique  Simulation  Eau souterraine  Agroécologie Index. décimale : 630 Agriculture et techniques connexes Résumé : Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil. Note de contenu : Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil. Technical Bulletin. An integrated model approach to the effect of water management on crop yield [texte imprimé] / Feddes, R. A. ; Wijk, A. L. M. (van)  . -  ILWMR IVCW . - ILWMR IVCW, 1977. ISSN : CI-09440 Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil. Langues : Anglais (eng) Mots-clés : Agriculture  Récolte  Drainage  Modèle mathématique  Simulation  Eau souterraine  Agroécologie Index. décimale : 630 Agriculture et techniques connexes Résumé : Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil. Note de contenu : Quanttifying the effectof drainage on crop yield is of essential importance in agricultural management. In this article a model is described with which this effect can be computed for both arable land and grassland, the factor acting in spring, summer and autumn are deal with separately arable land. In spring sowing date is the main factor affecting the crop yield. Sowing date depends to the village conditions of the soil to player. In autumn crop yield is influenced by the working conditions during harvest yields are derived from an experimental relationship between yield depression and number of days of earlier harvesting grassland. The effect of shallow groundwater table depths in winter and spring an the yield of the first and second cut can be determined with the workability model in an identical manner to that given for arable land. An example representative for the Netherlands is given for grass on peat soil.

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Technical Bulletins (New series), 6. Root water update model depending on soil water pressure head and maximum extraction rate / Hoogland, J. C.

Public ISBD Titre de série : Technical Bulletins (New series), 6 Titre : Root water update model depending on soil water pressure head and maximum extraction rate Type de document : texte imprimé Auteurs : Hoogland, J. C. ; Feddes, R. A. ; Belmans, C. Mention d'édition : Institute for Land and Water Management Research Editeur : Institute for Land and water Management Research Année de publication : 1981 ISBN/ISSN/EAN : CI-04950 Note générale : Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data. Langues : Anglais (eng) Mots-clés : Eau souterraine  Pression  Taux d'extraction Index. décimale : 551.49 Eaux souterraines Résumé : Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data. Note de contenu : Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data. Technical Bulletins (New series), 6. Root water update model depending on soil water pressure head and maximum extraction rate [texte imprimé] / Hoogland, J. C. ; Feddes, R. A. ; Belmans, C.  . -  Institute for Land and Water Management Research . - Institute for Land and water Management Research, 1981. ISSN : CI-04950 Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data. Langues : Anglais (eng) Mots-clés : Eau souterraine  Pression  Taux d'extraction Index. décimale : 551.49 Eaux souterraines Résumé : Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data. Note de contenu : Many present day models describing water uptake by root system are based on an analogy with ohm's law. These models require rather detailed information about root distribution, root densities, conductivities of the soil-root system, soil and plant resistances, etc. Often these parameters vary with type of soil and, also, with defth and time. A rather simple approach has been proposed by Feddes, Kowalik and Zaradny (1978). They compute root water extraction at the various defth depending on potential transpiration rate, rooting depth and the local prevailing soil water presure head. In this paper a modification is proposed in such a way that the maximum root water extraction is taken to be a decreasing function with depth. this functions starts at the soil surface with a value derived from literature data.

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