Utilisation De La Teledetection Pour Reconnaitre Et Cartographier Les Types De Prariries Permanentes,
2025
INRA-SAD
Utilisation De La Teledetection Pour Reconnaitre Et Cartographier Les Types De Prariries Permanentes, M Benoit, Colette Girard, E Vaubernier
IGC Proceedings (1977-2023)
Les statistiques concernant les prairies sont souvent decevantes pour repondre aux questions posees par les agronomes. Ainsi les seules distinctions actuelles sont : prairies artificielles, prairies temporaires de 5 ans et moins et superficies toujours en herbe. En particulier, aucun element decrivant les pratiques mises en ceuvres ou les niveaux de production n'est accessible par ces sources. Nous avons etabli les liaisons entre les etats de vegetation et leurs determinants d'une part, et entre ces etats de vegetation et des reponses spectrales d'autre part. Les 39 parcelles de prairies choisies pour leur diversite ont ete regroupees en 9 classes, selon …
The Application Of Remote Sensing To Grassland Resource Survey Of The Counties In China,
2025
Beijing Agricultural University
The Application Of Remote Sensing To Grassland Resource Survey Of The Counties In China, Chang Xiao-Guo, Xia Jing-Xin, Chia Shen-Siu
IGC Proceedings (1977-2023)
The application of remote sensing techniques to grassland resource surveys of the counties is a key task and will play a significant role in the rational use of grassland resources. Since 1980, we have mainly studied the application of visual interpretation techniques to the surveys on 18 countries, Inner Mongolia and Hebei Provinces, in the north of China. Comprehensively utilizing several remote sensing materials, quantitatively analysing the samples with mathematical stat i��tics, a method of remote sensing survey, which is comparatively faster, more economical, easier for extension and suitable for the county-level surveys, has been found. An example of the …
Special Enhancements Using Noaa Satellite Data To Evaluate Grasslands Of Western Canada,
2025
Agriculture Canada
Special Enhancements Using Noaa Satellite Data To Evaluate Grasslands Of Western Canada, H Mccartney, J Whiting, J Polson
IGC Proceedings (1977-2023)
The grazing and hay lands of Saskatchewan, a Province in western Canada, extend from the wide open short grass prairie of the south to the northern roughland bush pastures of the Aspen Parkland (Populus tremuloides). These areas total 7,853,000 ha. This study is part of a continuing effort directed towards the development of operational remote sensing analysis techniques for the estimation of grazing conditions in both native and seeded pastures in Saskatchewan. Multi-spectral remotely sensed data from satellites has proven useful in assessing crop vigour. In most cases, where drought assessment or monitoring was required, large land areas were involved …
Land Use And Land Degredation In Inner Mongolia Autonomous Region, China, By Means Of Remote Sensing,
2025
Beijing Normal University
Land Use And Land Degredation In Inner Mongolia Autonomous Region, China, By Means Of Remote Sensing, Zhao Ji, Fan Weihong
IGC Proceedings (1977-2023)
The Inner Mongolia Autonomous Region is located in northern Chi:t).a and characterized by a semi-arid climate. Most of the area is used as pasture land, although a small part in the south is used as agricultural land to meet the need of food for the r��sidents. In recent years, the land is becoming degradated and its _environment becoming more sensitive to the climatic changes and the influence of human activity than it was before. This is, in part, due to the original productive pattern and irrational utilization of land. In this stu��y, remote sensing technique which is a very effec. …
A Preliminary Study On The Relationships Between Biomass And Environmental Factors In Natural Grassland In Hulunbeir,
2025
Grassland Institute of Hulunbeir League,
A Preliminary Study On The Relationships Between Biomass And Environmental Factors In Natural Grassland In Hulunbeir, Pan Xueqing, Li Zhangchum, Lu Xinlong
IGC Proceedings (1977-2023)
The seasonal dynamic state of the above ground biomass (or herbage mass) of four main types of natural grassland were studied in Hulunbeir grassland. The four types were meadow steppe, Aneurolepidium chinense + Stipa grandis steppe, Aneurolepidium chinense steppe and tussock - small semi - shrubs steppe. The results of the research show that the herbage mass of all four types have strong positive correlations with the monthly accumulated temperature, mean temperature, and precipitation of the preceding month. Water is a major limiting factor to primary production in Hulunbeir grassland. This paper reports on the relationship between seasonal state of …
The Grassland Vegetation Structure, Productivity And Its Dynamics Of Ningxia,
2025
Ningxia Agricultural College Yungning
The Grassland Vegetation Structure, Productivity And Its Dynamics Of Ningxia, Guo Sijia, Xing Zhongzhi, Chen Yizhong, Li Kechang, Zhang Dongsheng, Ma Doucai
IGC Proceedings (1977-2023)
The Ningxia Hui Autonomous Region is situated in the semi-arid areas of northwest China, with an elevation of 1 100 m-2 200 m. The annual mean temperature is 7-9°C, the annual mean precipitation and evaporation are 118-660 mm and 1 400-2 400 mm respectively and the total hours of sunshine is 2 200-3 100 in a year (Guo Sijia et al., 1985). As Ningxia is located in the transitional section from semi-humid to semi-arid areas, there are multivarious types of native grassland in the region, but the zonal grasslands types are the steppe, desert-steppe and desert. During 1982-1986, observation stations …
Sociabilities, Morphologie Et Valeurs Nutritives Des Vegetations Prairiales,
2025
INRA
Sociabilities, Morphologie Et Valeurs Nutritives Des Vegetations Prairiales, J M. Dorioz, Ph Fleury, B Jeannin
IGC Proceedings (1977-2023)
Les especes dominantes des prairies presentent souvent une grande plasticite phenotypique dont les manifestations les plus spectaculaires au plan fourrager sont les changements du port, du volume relatif des organes et de la phenologie (Hedin, 1945; Hayne, 1983). L'amplitude de ces variations dans une meme region est mal connue. On peut done se demander dans quelle mesure elles remettent en cause la valeur indicatrice habituellement attribuee a ce type d'especes, en outre, s'il n'est pas utile de chercher a codifier la morphologie des dominantes, pour ameliorer les diagnostics agronomiques. Ce texte contient des reflexions autour de ces themes. 11 s'appuie …
Croissance Printainiere De La Prairire Permanente En Lorraine Dans Deux Petites Region Naturelles (Plateau Lorrain - Chatenois/ Bassigny),
2025
University of Kentucky
Croissance Printainiere De La Prairire Permanente En Lorraine Dans Deux Petites Region Naturelles (Plateau Lorrain - Chatenois/ Bassigny), A Benoit-Kung
IGC Proceedings (1977-2023)
Inspires des travaux de Lemaire, Salette et Laissus (Lemaire et al., 1982), Jes essais presentes ici ont pour objectif l'elaboration d'un modele de croissance de la prairie permanente, applique aux conditions semi-continentales des plaines de l'Est de la France. Afin de tester la variabilite inter regionale d'un tel modele, Jes essais ont ete implantes dans deux types de sols contrastes, les conditions climatiques etant identiques sur Jes deux secteurs. Cette demarche vise a l'etablissement de conseils aux agriculteurs en matiere de gestion de la fumure azotee en sortie d'hiver, sur prairies permanentes intensifiees.
Mapping Herbage Accumulation For The Hunter Region Of Australia Using Climatic Analysis, Growth Indices And Field Experiments, M J. Hill, M F. Hutchinson, A C. Kirby
IGC Proceedings (1977-2023)
Date on monthly and annual pasture production for use in farm budgeting, in farm management models and at the core of expert systems are rare for large areas of the Australian pastoral zone, and for large areas of the world. We have sought here to demonstrate a method of .overcoming this problem by the development of maps of annual and seasonal herbage accumulation for several types of improved pasture in the Hunter Region using comprehensive climatic data, a simple growth model (Fitzpatrick and Nix, 1975) and a small plot pasture trial at Scone (32°S).
Ecological Zoning Of Sao Paulo, Brazil For Tropical Forage Plants,
2025
lnstituto de Zootecnia, Nova Odessa*
Ecological Zoning Of Sao Paulo, Brazil For Tropical Forage Plants, P B. Alcantara, G.L Da Rocha, M J. Pedro Jr, P L. Donzelli
IGC Proceedings (1977-2023)
Climatic and edaphic aspects have been worldwide considered as the main limiting factors for forage production. Plant distribution is highly influenced by edaphic and climatic effects (Humphreys, 1981). In the same way researchers states that the rate of growth of pasture plants is expressed in dry matter production which is a function of the net rate of photosynthesis influenced by climatic factors (Whiteman, 1980). The basic climatic features were put togheter to be expressed as the Multifactor Growth Index which relates light, temperature and moisture affecting the growth of forage plants (Fitzpatrick & Nix, 1970). Present work made an ecological …
Correlation Of Degree Days With Herbage Yields On California's Annual Grasslands,
2025
University of California, Davis
Correlation Of Degree Days With Herbage Yields On California's Annual Grasslands, M R. George, W J. Clawson, C B. Wilson, R L. Willoughby, N K. Mcdougald
IGC Proceedings (1977-2023)
Seasonal precipitation and temperature patterns play a significant role in Mediterranean grasslands, influencing within and between year variation in herbage production (Bentley and Talbot 1951, Rossiter 1966, Pitte and Heady 1978). Within the growing season, accumulated degree-days (AAD) which integrate season length with temperature should be an ideal index to herbage production in California's annual grasslands. This paper presents the simple correlations of seasonal herbage yield with ADD and proposes an efficient method of estimating seasonal herbage production profiles.
The Optimum Structure Of Forage Production On Stock-Farm In Gora (Poland),
2025
Institute for Land Reclamation and Grassland Farming at Falenty
The Optimum Structure Of Forage Production On Stock-Farm In Gora (Poland), M Sc Zuzanna Sawicka
IGC Proceedings (1977-2023)
The main reason for undertaking this work is the decrease of cattle on stock-farms in Poland. This situation results from inappropriate structures of forage production and economic policies in agriculture. The stock-farm in Gora, situated in the center of Poland, is a middle classe farm, representing the above-mentioned problems. In many aspects, forage from grassland ought to be a dominant source of livestock feed, especially with regard to considerations of animal hygiene and organization of production. This work presents results of investigations on the optimum structure of forage production and economic aspects of profitable cattle breeding on a stockfarm in …
The Role Of Goats In New Zealand Hill Country Farming,
2025
DSIR
The Role Of Goats In New Zealand Hill Country Farming, D A. Clark, M G. Lambert
IGC Proceedings (1977-2023)
The predominant domesticated ruminants in New Zealand are sheep and cattle. However in the last decade other animal species have been incorporated into farming systems, particularly goats which have increased from 10 thousand to 1 million over that time. The motives for this change have primarily been economic ones, in an attempt by farmers to increase income and reduce costs. Goats provide direct financial returns to hill farmers through sale of fibre (mohair, cashgora, cashmere) and meat. In many instances however, the motivation has been one of reduction of weed control costs. Aspects of weed control, pasture response and grazing …
The Crop Of Some Varieties Of Grass And Their Economic Characterization,
2025
Godollo University of Agricultural Sciences
The Crop Of Some Varieties Of Grass And Their Economic Characterization, I Szucs, T Vajsz
IGC Proceedings (1977-2023)
A primary aim of agricultural enterprises is to make the most profitable use of their resources especially if they are scarce in order to attain a maximum of returns. In all sectors, and in grass management also, utilisation of resources can be intensified to the extent where the output value equals the costs of the last input unit. To achieve this, resources of the local enterprises are not sufficient. Therefore, the aim of our investigations is to find that point in the utilisation of different technologies where the last unit of resource returns a product of equal monetary value. Clearly, …
Forage Management: A Diagnosis Method,
2025
INRA
Forage Management: A Diagnosis Method, M Duru, J L. Fiorelli, S Lardon, J C. Moreau, P L. Osty
IGC Proceedings (1977-2023)
On commercial farms, grazing and forage stock management is especially complex because of the great number of variables that have to be controlled (animal performances, resource stocks ... ), of their inter-relationships and of weather perturbations. Our investigations consist in considering in which way and under which constraints farmers may ajust their forage resources, both in quantity and quality, to achieve desired animal performances. Therefore, it is very important to propose decision rules adapted to real farm conditions and control procedures to carry out these decisions during the year. For continuous stocking, it was suggested to describe the sward in …
Elements Pour Une Strategie D'Amenagement Et De Gestion: Exemple De La Problematique Pastorale Du Ferlo Senegalais (Sahel), J Poissonet, I Toure
IGC Proceedings (1977-2023)
La communaute rurale de Labgar, au nord du departement de Linguere, couvre 70 000 hectares. Trois ethnies coexistent au sein de cette communaute: !es Maures qui vivaient de la chasse et ne pratiquent plus que l'elevage; !es Ouolofs qui pratiquent principalement !'agriculture et accessoirement l'elevage; !es Peulhs qui constituent la majorite de la population et vivent essentiellement de l'elevage. Ces populations vivent dans une region ecologique « marginale » particulierement vulnerable: deficits de pluies frequents; potentiels fourragers, agricoles et hydriques fluctuants, contraintes multiples affectant !es populations humaines, le cheptel et la vegetation. De nombreuses enquetes socio-economiques ont ete menees aupres …
Fonctions Et Usages Des Resources Herbacees: Un Exemple Dans Les Prealpes Du Sud (France),
2025
INRA
Fonctions Et Usages Des Resources Herbacees: Un Exemple Dans Les Prealpes Du Sud (France), B Hubert, J Lasseur, B Coppal, P Jullian
IGC Proceedings (1977-2023)
L'observation de la mobilisation des ressources vegetales dans !es elevages ovins des Prealpes du sud ( 600-1000 m), associant prairies et parcours, conduit a constater la diversite des pratiques des agriculteurs ; nous illustrons nos reflexions a partir de l'etude de !'utilisation des prairies temporaires dans trois exploitations caracteristiques (1, 2 et 3) ayant respectivement des troupeaux de 320, 165 et 250 brebis. La surface en terre labourable et prairie permanente (37, 39 et 40 ha) est peu differente d'une exploitation a l'autre, mais !es exploitations 1 et 3 sont quasi specialisees en elevage alors que la 2 produit aussi …
Pastures And Profit In An Australian Ley Farming System,
2025
University of Kentucky
Pastures And Profit In An Australian Ley Farming System, M A. Ewing, D J. Pannell, D A. Morrison
IGC Proceedings (1977-2023)
Annual pasture-cereal rotations dominate land use in the 250-600 rnrn rainfall zone of southern Australia (Puckridge and French, 1983). Although this ley farming system appears simple in concept, farm managers attempting to maximise profits can face complex and difficult decisions. Use of annual legume pasture species such as subterranean clover (Trifolium subterraneum L.) and medics (Medicago spp.) is widespread. However there are soils, particularly in arid areas, on which legumes do not persist in pasture, so that volunteer herbs and grasses are the dominant pasture species. On these soils a recent trend has been the introduction of legume crops, mainly …
Modeling Plant Species Competition In Conjunction With Selective Grazing,
2025
University of Arkansas
Modeling Plant Species Competition In Conjunction With Selective Grazing, O J. Loewer, C P. West, L D. Parsch, H D. Scott
IGC Proceedings (1977-2023)
The dynamic simulation model GRAZE (Loewer et al., 1987) incorporates plant and beef animal growth in describing the grazing process. GRAZE had its beginnings at the University of Kentucky in 1976 (Walker et al., 1977; Loewer et al., 1981 ; Loewer and Smith, 1986) and was further developed through three regional research projects (Watson and Wells, 1985). Currently, it is being utilized and enhanced by the regional research project S-221 : Development of Profitable Beef-Forage Production Systems for the Southern Region, in part because of its utility in providing biophysical input-output relationships for purposes of economic analysis (Parsch and Loewer, …
A Methodology For Combining Field Data, Experimental Research And Modelling In The Development Of Grassland Systems,
2025
University of Kentucky
A Methodology For Combining Field Data, Experimental Research And Modelling In The Development Of Grassland Systems, E S. Kristensen, J T. Sorensen
IGC Proceedings (1977-2023)
Animal production from grassland is a complex process involving man as well as animals and plants which interact in a changing environment. The production can be considered as two interacting systems, a management and a production system as shown in Figure I. The manager monitors the production, compares this information with goals and if necessary makes adjustments in inputs in order to achieve the goals. The complexity of this process is of course dependent on the number of controlled factors. Beef production based on purchased young bulls fed entirely on pasture without conservation is, for example, much simpler to manage …
