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Articles 14881 - 14910 of 291673

Full-Text Articles in Physical Sciences and Mathematics

Sex Linkage Of Growth And Forage Attributes In Buffalograss (Buchloe Dactyloides), J A. Quinn Apr 2025

Sex Linkage Of Growth And Forage Attributes In Buffalograss (Buchloe Dactyloides), J A. Quinn

IGC Proceedings (1977-2023)

Buchloe dactyloides (Nutt.) Engelm. is a perennial, sod-form­ing shortgrass of central North America (Hitchcock, 1951), thriving under semiarid conditions and increasing under mod­erate to heavy grazing (Quinn, 1987). The species is largely dioecious, and sex ratios are either 1 : 1 or female-biased (Quinn and Engel, 1986). Isolated plants under controlled conditions are strictly male, strictly female, or monoecious (0 to 20 %, depending on the population). Over the last half-century, buffalograss has been widely used in central North America for reseeding depleted rangelands and for erosion control (Quinn, 1985), and recently it has received renewed attention as a turf …

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Phylogenetics Of Apomictic Paspalum Dilatatum, B L. Burson Apr 2025

Phylogenetics Of Apomictic Paspalum Dilatatum, B L. Burson

IGC Proceedings (1977-2023)

Paspalum dilatatum Pair., dallisgrass, is a warm-season grass native to South America. There are several biotypes of this species and common dallisgrass is the most prevalent. It is an important pasture grass throughout the warmer regions of the world but has two major impediments-low fertility and suscep­tibility to ergot (Claviceps paspali). Improvement efforts have been unsuccessful because the common biotype is a complex natural hybrid with an unbalanced genomic composition and an obligate apomict, a form of asexual reproduction that has prevented improvement by conventional plant breeding methods. To circumvent this apomictic barrier, phylogenetic investiga­tions were initiated to …

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Regulation Of Apomixis In Buffelgrass, D L. Gustine, R T. Sherwood, I Gounaris Apr 2025

Regulation Of Apomixis In Buffelgrass, D L. Gustine, R T. Sherwood, I Gounaris

IGC Proceedings (1977-2023)

The apomixis program at the Pasture Laboratory has the long-term objective of finding procedures to manipulate the type of embryo sac which develops in crop species. We would like to induce at will, formation of functional apomictic embryo sacs in obligately sexual species such as maize and wheat, and to induce sexual reproduction in obligate apomicts, such as dallisgrass. The benefits of this capability for plant breeding would be enormous : 1) desirable characteristics could be reproduced over generations in normally sexual genotypes through induced apomixis and 2) genetic variability in apomic­tic genotypes could be unlocked through sexual crosses. Angiosperms …

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Cytological And Histological Mechanisms Of 2n Pollen Formation In Hybrid Napier Grass, Y K. Cheng, K T. Lo, Y S. Sheng Apr 2025

Cytological And Histological Mechanisms Of 2n Pollen Formation In Hybrid Napier Grass, Y K. Cheng, K T. Lo, Y S. Sheng

IGC Proceedings (1977-2023)

Hybrid pennisetum is an interspecific hybrid between pearl millet (Pennisetum americanum) and napier grass (P. purpureum). The combing of good characteristics of these two species by hybridization was reported (Cheng, 1984). The hyb­rids are triploid, 2n = 21, and propagated vegetatively. Thus a fertile hybrid would offer opportunities for seed production and forage improvement through hybridization. 2n gametes has been used recently as an alternative method to chemical treatments in a breeding program. The objectives of this inves­tigation were to search for triploid hybrid pennisetum which would produce 2n pollen and to determine the cytological and histological origin of …

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Apomixis And Sexuality In Brachiaria Decumbens Stapf., C B. Do Valle, Y H. Savidan, L Jank Apr 2025

Apomixis And Sexuality In Brachiaria Decumbens Stapf., C B. Do Valle, Y H. Savidan, L Jank

IGC Proceedings (1977-2023)

Brachiaria decumbens Stapf is a perennial tropical forage grass, native to east African savannas. It was introduced to Brazil in the 1960's and is now widely cultivated over 30 million hectares in Central Brazil alone. The two commercial varieties are apomictic tetraploids (2n = 4x = 36), producing uniform progeny, and were selected for their high dry matter production and persistence on poor acid soils. They lack, however, resist­ance to spittlebugs (Deois spp., Zulia spp., Aeneolania spp.) and produce forage of low nutritive value, especially during the dry winter months. The absence of natural variability associated to apomictic reproduction has …

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Amelioration De La Qualite Du Fourrage Chez La Fetuque Elevee (Festuca Arundinacea Schreb.), W Pietraszek, J F. Chosson Apr 2025

Amelioration De La Qualite Du Fourrage Chez La Fetuque Elevee (Festuca Arundinacea Schreb.), W Pietraszek, J F. Chosson

IGC Proceedings (1977-2023)

Tres interessante dans nos climats pour son rendement et sa rusticite, la Fetuque elevee demande toutefois, pour etre davan­tage utilisee, qu'un effort de selection soit fait pour ameliorer sa qualite. Celle-ci est essentiellement determinee par l'appeti­bilite, l'ingestibilite et Ia digestibilite qui ne peuvent etre mesurees directement que par des troupeaux d'animaux. Leur mesure implique que !'on dispose d'une quantite importante de materiel vegetal et de plus le maintien et la manipulation des animaux sont lourds et couteux. Le selectionneur devrait done pouvoir disposer d'autres cri­teres, indirects, pour pouvoir estimer Ia qualite de son materiel vegetal dans Jes premiers stades du …

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Using Diverse Species To Improve Quality And Yield In The Pennisteum Genus, W W. Hanna, M Dujardin, W G. Monson Apr 2025

Using Diverse Species To Improve Quality And Yield In The Pennisteum Genus, W W. Hanna, M Dujardin, W G. Monson

IGC Proceedings (1977-2023)

Pearl millet, Pennisetum glaucum (L.) R. Br., and napier­grass, P. purpureum Schum., are two of the major forage pro­ducing Pennisetum species in the tropics and subtropics. Pearl millet is known for its high quality forage and significant pro­gress has been made in developing improved cultivars (Hanna, et al., 1988). Napiergrass has been successfully crossed with pearl millet to produce high quality and high yielding perennial interspecific (PMN) forage hybrids (Hanna and Monson, 1980 and Muldoon and Pearson, 1979). A germplasm evaluation program and an interspecific hybri­dization program at Tifton, GA (Hanna and Dujardin, 1985) has resulted in the identification of …

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Forage Yield And Quality Of Orchardgrass And Tall Fescue Under Simulated Acid Precipitation, J H. Reynolds, J D. Wolt Apr 2025

Forage Yield And Quality Of Orchardgrass And Tall Fescue Under Simulated Acid Precipitation, J H. Reynolds, J D. Wolt

IGC Proceedings (1977-2023)

Cool-season forage grasses have received less attention than other crops with regard to their sensitivity to acid precipitation even though they are especially well-adapted to portions of the eastern U.S.A. where acid precipitation with a pH less than 4.5 has been documented. Tall fescue (Festuca arundinacea Schreb.) is perhaps the most widely grown cool-season grass in the transition zone of the eastern U.S.A. where it occupies from 12 to 14 million hectares. Orchardgrass (Dactylis glomerata L.) is also widely grown in the eastern U.S.A. Workers in Oregon, such as Cohen et al., 1982, have found few effects on forage yield …

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Selection Des Graminees Fourrageres Pour La Qualite: Des Criteres Bases Sur Des References Avec Animaux, M Gillet, J Scehovic, M Marton, L Huguet Apr 2025

Selection Des Graminees Fourrageres Pour La Qualite: Des Criteres Bases Sur Des References Avec Animaux, M Gillet, J Scehovic, M Marton, L Huguet

IGC Proceedings (1977-2023)

La selection des fourrages pour la qualite exige l'utilisation de criteres indirects. Ceux-ci devraient etre etablis par correla­tion avec des criteres mesures sur animaux: Cela necessite un nombre suffisant de genotypes de qualite differente. 11 faut done que la selection pour la qualite ait deja en partie reussi. A defaut, les selectionneurs utilisent souvent des correlations eta­blies en faisant varier le stade de la plante. Mais sont-elles vala­bles pour comparer des genotypes a stade egal? Ils utilisent aussi les preferences des animaux (« appetibilite ») car cela per­met de comparer plusieurs genotypes avec un seul lot d'ani­maux (Jadas-Hecart, 1982; Gillet …

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Variability For Mineral Concentrations Contained In High-Digestible Cell Fractions In Orchardgrass, S Saiga, H Yoneya, K Iwane, K Watanabe Apr 2025

Variability For Mineral Concentrations Contained In High-Digestible Cell Fractions In Orchardgrass, S Saiga, H Yoneya, K Iwane, K Watanabe

IGC Proceedings (1977-2023)

Metabolic disorders of ruminants including grass tetany are associated with mineral imbalances of forage. Powell et al. (1978) found that lambs on tall fescue utilized Ca, P, and Mg less efficiently although the concentrations were rather higher than in the other grasses. As there are large differences in char­acteristics among orchardgrass (Dactylis glomerata L.) culti­vars, the efficiency of minerals also must differ in different culti­vars. For one reason, it is considered that the efficiency to ruminants is due to the rate contained in digestible cell fraction. The objectives of this study were to determine seasonal change of cell fractions, …

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The Efficacy Of A High Magnesium Italian Ryegrass Cultivar In Alleviating Hypomagnesamia, G Moseley, D M. Baker, D H. Hides Apr 2025

The Efficacy Of A High Magnesium Italian Ryegrass Cultivar In Alleviating Hypomagnesamia, G Moseley, D M. Baker, D H. Hides

IGC Proceedings (1977-2023)

Hypomagnesaemia continues to cause serious economic losses in grazing livestock and recent evidence suggests that its incidence may be increasing. The disease is characterised by a drop in the concentration of magnesium in extracellular fluid and occurs in two forms, chronic and acute. Both forms give rise to classical clinical symptoms which may either result in death or drastically reduced levels of production. The body does not contain a major source of labile magnesium nor does it have a homeostatic mechanism for controlling the level of magnesium in extracellular fluid. The maintainance of normal levels therefore depends almost entirely on …

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The Breeding Of Pasture Varieties Of Alfalfa (Medicago Sativa), J M. Piskovatsky, V A. Katov, G V. Stepanova Apr 2025

The Breeding Of Pasture Varieties Of Alfalfa (Medicago Sativa), J M. Piskovatsky, V A. Katov, G V. Stepanova

IGC Proceedings (1977-2023)

The work of developing new pasture varieties of alfalfa has been conducted in the All-Union Fodder Research Institute from 1975 onwards. The pasture varieties must be persistent under grazing, and must have a high competitive ability in mix­tures with grasses : meadow fescue, timothy and others.

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Evaluation And Selection Of The Salt-Tolerant Alfalfa, Geng Huazhu Apr 2025

Evaluation And Selection Of The Salt-Tolerant Alfalfa, Geng Huazhu

IGC Proceedings (1977-2023)

Alfalfa (Medicago sativa) as a good forage has b��en popu­larly cultivated for a long time in China. Now it is mainly distributed in the north of the Yangtse River, and covers about 1.3 million hectares in the 14 provinces and regions. It can be planted in the saline-alkali areas, accept alluvial plains and hill regions, for instance, the North of Jiangsu, East of Hebei, North-west of Shandong and Xingjiang. The alfalfa is success­fully used in improving and utilizing the saline-alkali soils for developing animal husbandry in the Gangzhou District of Hebei Province, where its planting area is increasing rapidly, …

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Use Of New Methods For Grass And Legume Breeding In Western Region Of The Soviet Union, R Dapkus Apr 2025

Use Of New Methods For Grass And Legume Breeding In Western Region Of The Soviet Union, R Dapkus

IGC Proceedings (1977-2023)

The climatic conditions of the Western region of the Soviet Union are favourable for grassland production which provides the major part of forage for livestock nutrition. In raising grassland productivity, new varieties play an important role. Adapted varieties with high yield potential must be used. For developing such varieties, the Fodder Crops Breeding Centre fbr the Western region of the Soviet Union was estab­lished at the Lituanian Agricultural Research Institute in 1972 on the basis of experience since 1922, when selection of herbage species was initiated there. During the past twenty years, breed­ing work has progressed rapidly. At present, breeding …

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Cool Season Grazing Of Winter-Active Lucernes, J.G H. White, W J. Lucas Apr 2025

Cool Season Grazing Of Winter-Active Lucernes, J.G H. White, W J. Lucas

IGC Proceedings (1977-2023)

In New Zealand, lucerne (Medicago sativa L.) is commonly grazed with sheep for much of the year, but winter production is low and alternative, higher-cost feeds need to be provided. However, in most lucerne-growing areas, winters are relatively mild (Lincoln June-August mean temperature 6.2°C), and the recent release of cool-season active cultivars has resulted in considerable farmer interest in winter grazing of lucerne. Stan­dard winter dormant cultivars such as Wairau are normally grazed once in early June for aphid control (Smallfield et al., 1980), then remain ungrazed for at least three months. Cool­season active cultivars are known to produce …

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Improvement Of Season Growth And Resistance To Crown Rust Of Tall Fescue Through Hybridization Between Mediterranean Populations And Adapted Cultivars In Japan, Y Ueyama, S Sato Apr 2025

Improvement Of Season Growth And Resistance To Crown Rust Of Tall Fescue Through Hybridization Between Mediterranean Populations And Adapted Cultivars In Japan, Y Ueyama, S Sato

IGC Proceedings (1977-2023)

Since tall fescue (Festuca arundinacea, Schreb.) is one of the temperate grass species which have good heat tolerance, it is mainly used in grasslands established throughout southwestern Japan where it is hot and humid in summer and mild in winter. The cultivars which have good adaptability to the Japanese condition mainly originated from European or North American populations. Mediterranean populations of tall fescue have good growth potential under the low temperature and short day conditions (Evans et al., 1973) and high levels of crown rust resistance (Wofford et al., 1982). But, the grass species distributed in Mediterranean area are known …

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Progress And Prospects For Combining Resistance To Meloidogyne Javanica (Grass Root-Knot Nematode) With Improved Forage Yield In Chloris Gayana (Rhodes Grass), P A. York Apr 2025

Progress And Prospects For Combining Resistance To Meloidogyne Javanica (Grass Root-Knot Nematode) With Improved Forage Yield In Chloris Gayana (Rhodes Grass), P A. York

IGC Proceedings (1977-2023)

Meloidogyne javanica, root-knot nematode, has been described as the most serious pest of crops in Central Africa (Daulton & Curtis, 1963). It is widespread in Zimbabwe and very damaging to susceptible crops, particularly tobacco. Good tobacco growers use integrated control measures, sterilizing seed-beds with methyl bromide, lands with ethylene dibromide (EDB) and resting with three or four year Katambora Rhodes grass pastures. Katambora controls M. javanica, improves soil structure, reduces erosion and provides cattle fodder as grazing and poor quality hay. A breeding project has been established in Zimbabwe to combine the better forage production of tetraploid Rhodes grass strains …

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Intermediate White Clover - A Model For Clover Persistence On The Gulf Coast In Usa, G W. Evers Apr 2025

Intermediate White Clover - A Model For Clover Persistence On The Gulf Coast In Usa, G W. Evers

IGC Proceedings (1977-2023)

The Gulf Coast region of the USA is classified as subtropical (Rotar and Kretschmer, 1985). Persistence of perennial temper­ate legumes in this area is poor because of climatic, manage­ment, insect and disease factors (Kendall and Stringer, 1985). Frosts during the short-day season limit flowering and seed set of perennial tropical legumes (Rotar and Kretschmer, 1985; Evers, 1973). Annual Trifolium spp. or perennial species which act as annuals, are used in the area (Evers, 1984). The major limitation of annual legumes is dependable reseeding each fall. Although classified as a perennial, Hollowell (1966) has suggested that white clover (Trifolium repens …

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Productivity Of Selected High And Low Leaf Area Expansion Festuca Arundinacea Strains, D A. Sleper, C J. Nelson Apr 2025

Productivity Of Selected High And Low Leaf Area Expansion Festuca Arundinacea Strains, D A. Sleper, C J. Nelson

IGC Proceedings (1977-2023)

A selection program was initiated in 1975 to select for high (H) - and low (L)-LAER in a broad-based population of tall fescue ( Festuca arundinacea Schreb.) to improve vegetative herbage yield (Nelson and Sleper, 1983). Response to divergent selection was linear and symmetric for five cycles (Reeder et al., 1984). Mean increase in selecting for H-LAER was greater than 10 % per cycle ; a mean decrease of more than 8 % per cycle was observed when selecting for L-LAER. Nelson et al. (1977) and Reeder et al. (1984) showed that H­LAER genotypes had wider leaves and higher leaf …

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Effects Of Acid Soil Selection On Agronomically Important Traits In Alfalfa, J H. Bouton, D E. Radcliffe Apr 2025

Effects Of Acid Soil Selection On Agronomically Important Traits In Alfalfa, J H. Bouton, D E. Radcliffe

IGC Proceedings (1977-2023)

Acid soils and their related toxicities are found in every con­tinent of the world. Since liming and fertilization rarely over­come subsoil acidity, poor rooting usually results when grow­ing sensitive legumes such as alfalfa ( Medicago sativa L.). Subsoil liming increased alfalfa yield 46 % over conventionally limed controls indicating deeper rooting achieved through an ability to overcome subsoil toxicity significantly enhanced stand life and productivity (Bouton et al., 1986). If acid soil tol­erance could be incorporated into new multiple-pest resistant cul ti vars without loss of their desirable traits, farmers may real­ize the benefits of any new alfalfa cultivar. The …

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Improvement Of Winter, Early Spring Growth In Temperate Pasture Grasses, D R. Kemp, M O. Humphreys, C F. Eagles Apr 2025

Improvement Of Winter, Early Spring Growth In Temperate Pasture Grasses, D R. Kemp, M O. Humphreys, C F. Eagles

IGC Proceedings (1977-2023)

Improvement of pasture growth during winter and early spring in temperate regions has been a major goal of many grass breeding programmes. Improvements have been made by selecting for increased yield in early spring, although the basis of these yield improvements is poorly understood. The increase, measured as vegetative components of yield, has been interpreted as improved efficiency of growth at low tempera­tures. However, there is evidence that increased grass growth rates during late winter and early spring are associated with reproductive development (Kemp, 1985, 1988). In this paper we review physiological evidence for growth differences between genotypes during winter …

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Kikuyu Grass Improvement For Grazing And Amenity Uses, G J. Piggot, H M. Morgan Apr 2025

Kikuyu Grass Improvement For Grazing And Amenity Uses, G J. Piggot, H M. Morgan

IGC Proceedings (1977-2023)

Kikuyu grass (Pennisetum clandestinum) is a stoloniferous perennial important in warm-temperate and sub-tropical regions for grazing, erosion control, or amenity uses. Genetic improvement and the registration of cultivars has occurred in Australia (Wilson, 1975; Anon., 1983a, 1983b). Evaluation in New Zealand of this material has investigated the potential for further improvement of kikuyu grass for grazing and amenity uses. In this work, plants considered suitable for selection as a « grazing» type have erectness, large leaves, low stolons number, and high yield. «Amenity» types have fines leaves, thin stolons, low stolon number, and a prostrate and dense habit.

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Adaptation Of The Tree Legume Leucaena To Avid Tropical Soils, E M. Hutton Apr 2025

Adaptation Of The Tree Legume Leucaena To Avid Tropical Soils, E M. Hutton

IGC Proceedings (1977-2023)

Leucaena leucocephala (Lam.) de Wit is native to alkaline soils of Central America, especially Mexico. It is persistent and widely grown in the tropics for leafy, high protein forage giving high productivity in cattle and goats. Leucaena thrives in fert­iles soils with pH's in excess of about 5.5. In the tropics, includ­ing 55 % of South America, 40 % Africa and 37 % Asia, where soils are infertile oxisols and ultisols with pH's 5 or less, com­mon Leucaena varieties like Cunningham lack productivity and persistence. Genetic adaptation of L. leucocephala varieties to acid trop­ical soils was found possible (Hutton, 1981 …

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Varietal Differences Of Competitive Ability During Establishment Stage In Dactylis Glomerta And Lolium Perenne, S Sugiyama Apr 2025

Varietal Differences Of Competitive Ability During Establishment Stage In Dactylis Glomerta And Lolium Perenne, S Sugiyama

IGC Proceedings (1977-2023)

Herbage grasses are usually grown in association with other herbage species in pastures. But populations which are very productive under the pure swards do not necessarily show high productivity under the mixed swards (Eagles, 1983). Thus, competitive ability becomes important in determining the pro­ductivity of component species in mixed swards. This paper examines the varietal differences of performance during estab­lishment stage when grown in association with other grass species, and morphological characteristics affecting it for two grass species, Dactylis glomerata and Lolium perenne.

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Forage And Seed Yield Of 9 Chloris Gayana (Rhodes Grass) Varieties At 3 Sites In Zimbabewe, P A. York, E Nyamandzawo, E Bemont Apr 2025

Forage And Seed Yield Of 9 Chloris Gayana (Rhodes Grass) Varieties At 3 Sites In Zimbabewe, P A. York, E Nyamandzawo, E Bemont

IGC Proceedings (1977-2023)

Katambora Rhodes grass (diploid) is grown in rotation with tobacco in Zimbabwe to control Meloidogyne javanica (root­knot nematode). A 4 year ley is recommended (Martin, 1967) as the nematode can survive in bare fallow for up to 4 years. Katambora produces less herbage than Zimbabwe Giant, and is less palatable than it and other tetraploids. Potential area of use is 200 to 250 thousand ha, and annual replacement 60,000 ha. A breeding project was initiated in 1986 to combine the agronomic value of tetraploid types with the nematode resistance of Katambora. In addition to forage yield and nematode resistance seed …

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Bean Yellow Mosaic Virus Resistance In Arrowleaf Clover, G R. Smith, I J. Pemberton Apr 2025

Bean Yellow Mosaic Virus Resistance In Arrowleaf Clover, G R. Smith, I J. Pemberton

IGC Proceedings (1977-2023)

Arrowleaf clover (Trifolium vesiculosum Savi) is a winter annual forage legume often overseeded on warm-season peren­nial grass pastures in the southern region of the United States. Bean yellow mosaic virus (BYMV) can reduce forage pro­duction, seed production and cause plant death of arrowleaf clover (Gibson et al., 1979; Pratt et al., 1982). Resistance to BYMV has been identified in red clover (Trifolium pratense) and the inheritance reported in detail (Taylor et al., 1986). A research program was initiated in 1985 to quantify the effects of BYMV on arrowleaf and to develop BYMV resistant arrowleaf germplasm through recurrent …

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Breeding For Resistance To Root Rot In Red Clover, B Andersson, U Kristiansson Apr 2025

Breeding For Resistance To Root Rot In Red Clover, B Andersson, U Kristiansson

IGC Proceedings (1977-2023)

Red clover (Trifolium pratense L.) is one of the most import­ant species for forage production in Sweden. The use of red clo­ver is however restricted by poor persistence among other things caused by attacks of fungal diseases like clover crown rot and root rot. Investigations have shown (Rufeldt, 1986) that root rot is distributed in almost every field where red clover is grown and is one of the main reasons for the poor persistence. In the same investigations Fusarium roseum, Phoma medicaginis and Cylindrocarpon sp. are pointed out as the most important fungi in the root rot complex. One …

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An Induced Non-Nitrogen-Fixing Mutant In Stylosanthes Guianensis, J W. Miles, R Sylvester-Bradley Apr 2025

An Induced Non-Nitrogen-Fixing Mutant In Stylosanthes Guianensis, J W. Miles, R Sylvester-Bradley

IGC Proceedings (1977-2023)

A reliable seedling genetic marker would • improve the efficiency of a recurrent selection scheme used in the tropical forage legume Stylosanthes guianensis (Miles, 1985; Cameron and Irwin, 1986). However, seedling markers are rare in S. guianensis. Only presence vs. absence of stem pubescence is reported (Cameron and Irwin, 1986), and this is an unreliable marker in many crosses (Miles, unpublished data). We initiated a project to induce a seedling mutant with gamma radiation. Non-nodulating mutants have been found in other legume species (e.g. Davis et al., 1985) so our project was deliberately designed to identify these if they occurred. …

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The Role Of Root System In Tall Fescue (Festuca Arundinacea Schreb.) Productivity, N Gaborcik Apr 2025

The Role Of Root System In Tall Fescue (Festuca Arundinacea Schreb.) Productivity, N Gaborcik

IGC Proceedings (1977-2023)

Dry matter production of tall fescue (Festuca arundinacea Schreb.) is usually analysed from the following aspects: 1. CO2 metabolism., 2. leaf area index., 3. morphological traits. The relationship between photosynthesis and DM production of this species is relatively complex and not yet clearly elucidated (Wilhelm and Nelson, 1978). On the other hand a close relationship between the leaf area index and DM production of this species was confirmed (Poskuta et al., 1986; Gaborcik, 1986 a). There is relatively less information about the relation­ship between root system characteristics and shoot DM pro­duction (Elkins et al., 1979). The aim of this …

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Genetic Variances In Crested Wheatgrass - Alfalfa Mixtures, K H. Asay, D A. Johnson Apr 2025

Genetic Variances In Crested Wheatgrass - Alfalfa Mixtures, K H. Asay, D A. Johnson

IGC Proceedings (1977-2023)

Since it was first successfully introduced into North America from Eurasia in 1906 (Dillman 1946), crested wheatgrass [Agropyron cristatum (L.) Gaertner, A. desertorum (Fish. ex Link) Schultes, and A.fragile (Roth) Candargy] has had more impact on revegetation of western rangelands in North America than any other grass. Much of the early crested wheat­grass seedings were made as monocultures ; however, the multiple demands now made on rangelands dictate that other grass, shrub, and forb species be included in the seeding mix. The advantages of grass-legume mixtures in terms of improved forage quality and productivity are well documented (Trenbath, 1974). …

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