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Articles 31 - 60 of 253
Full-Text Articles in Soil Science
Mutualistic Symbiosis Of Tall Fescue And Fungal Endophyte, C S. Hoveland, C W. Bacon, N S. Hill
Mutualistic Symbiosis Of Tall Fescue And Fungal Endophyte, C S. Hoveland, C W. Bacon, N S. Hill
IGC Proceedings (1977-2023)
The greatly improved performance of livestock consuming low-endophyte tall fescue (Festuca arundinacea) forage has stimulated production of endophyte-free seed and replanting Acremonium coenophialum infected pastures (Stuedemann and Hoveland, 1988). Since endophytic fungi co-evolved with their host and are non-pathogenic, the endophyte-plant relationship is likely a mutualistic symbiosis (Bacon and Siegel, 1988). An important question arises as to whether tall fescue free of the endophyte will have the same productivity and persistence as infected grass in stressful environments. If the fungus benefits from the association by receiving nutrients, protection, reproduction, and dissemination, then the plant may be aided by …
Contribution Of Red Clover To Maize Grain Yields, K D. Johnson, D K. Greene, J H. Cherney
Contribution Of Red Clover To Maize Grain Yields, K D. Johnson, D K. Greene, J H. Cherney
IGC Proceedings (1977-2023)
Renewed emphasis has been placed on crop rotation systems that include a perennial legume. Reasons for this interest include protection of soil from erosion, protection of ground water from nitrate contamination, reduction of soil compaction, and potential for fewer inputs which could reduce costs of grain production. Barnes et al. (1985) reported that a nondormant alfalfa (Medicago sativa L.) selected for increased Nin the root and crown had similar summer herbage yield as adapted dormant cultivars, but provided 62 % more symbiotically fixed N for a following crop than dormant cultivars. If most benefit is to be derived from cultivars …
Effets De La Modulation De La Fertilization Azotee Sur La Productive Du Brachiaria Decumbens, Francoise Artus-Poliakoff, F Champenhet
Effets De La Modulation De La Fertilization Azotee Sur La Productive Du Brachiaria Decumbens, Francoise Artus-Poliakoff, F Champenhet
IGC Proceedings (1977-2023)
Pour le choix d'especes ameliorees, selectionnees pour !'intensification fourragere a la Martinique, Brachiaria decumbens presente une faible sensibilite aux phenomenes saisonniers (Artus, 1986), mais sa productivite n'en demeure pas moins variable malgre !'irrigation complementaire en saison seche (Artus-Poliakoff et al., 1988). La fertilisation azotee, indispensable a !'expression des potentialites de rendement d'une telle graminee, accentue ces variations saisonnieres par stimulation de la croissance en periode favorable a la vegetation (CaroCostas et al., 1960; Salette, 1971). L'ajustement du chargement a la quantite d'herbe disponible ou le report fourrager sous forme de foin ou d'ensilage sont des techniques difficiles a maitriser et …
The Diagnosis Of Grassland Mineral Nutrient Status Through Herbage Analysis, J Salette, Lydie Huche
The Diagnosis Of Grassland Mineral Nutrient Status Through Herbage Analysis, J Salette, Lydie Huche
IGC Proceedings (1977-2023)
It appears more and more clearly that soil analysis is not sufficient to give a good approximation of the mineral status of grassland soils. In perennial crops leaf analysis and empirical critical levels are widely utilized. This grassland approach emphasizes the good results which can be obtained for nitrogen, potassium, phosphorus not from leaf but from the whole herbage plant analysis. This paper deals with pure grass stands.
Efficacute De La Fertilization Minerale Des Prairies En Sol Alluvial, L Solimowski, R Lyszczarz, R Dembek
Efficacute De La Fertilization Minerale Des Prairies En Sol Alluvial, L Solimowski, R Lyszczarz, R Dembek
IGC Proceedings (1977-2023)
Le sol alluvial de la vallee basse de la Vistule offre des lieux naturels favorables a la culture des herbages (Cieslinski et Raszeja, 1983). On pratique assez souvent la seule fertilisation azotee, consideree comme la plus rentable. L'objectif de notre essai etait d'etudier !'influence des differents elements fertilisants apportes pendant plusieurs annees sur la culture, !'evolution de la composition botanique de la prairie, de la teneur en elements nutritifs de l'herbe et de la fertilite du sol.
The Depletion Of Soil K As Affected By Fertilization Of Eragrostis Curvula Used For Hay Production, N.F G. Rethman, C C. De Witt
The Depletion Of Soil K As Affected By Fertilization Of Eragrostis Curvula Used For Hay Production, N.F G. Rethman, C C. De Witt
IGC Proceedings (1977-2023)
Eragrostis curvula is widely planted as a hay crop in the summer rainfall areas of South Africa. For many years the main yield determinants have been regarded as N and P. As a result of the depleting effect of crop removal low K status is becoming more common. The beneficial effect of K fertilization, in combination with N, has been illustrated by Miles et al. (1986) and Rethman and De Witt (1839). Information on the rate of build up and/or depletion of soil K under different fertilization regimes is, however, required to facilitate the planning of fertilization strategies. The monitoring …
Variations Saisonnieres De La Croissance D'Une Prairie De Setaria Anceps En Guadeloupe, P Cruz, O Sobesky
Variations Saisonnieres De La Croissance D'Une Prairie De Setaria Anceps En Guadeloupe, P Cruz, O Sobesky
IGC Proceedings (1977-2023)
La production des cultures fourrageres en zones tropicales est frequemment modifiee par des effets saisonniers. Le deficit hydrique, la photoperiode et la temperature peuvent etre a l'origine de ces variations mais seulement le premier facteur peut etre controle a l'echelle d'une parcelle. L'effet de la photoperiode est bien connu sur des plantes stoloniferes comme le Pangola, lequel reduit fortement sa croissance pendant la saison de jours courts (Salette, 1971; Cruz et al., 1989). Parmi certaines plantes a talles (Crespo, 1986) des variations plus faibles sont rapportees mais sans faire la part de l'effet des basses temperatures. L'objectif de ce travail …
Shading Increases Yield Of Nitrogen-Limited Tropical Grasses, D.W M. Wild, J R. Wilson, W W. Stur, H M. Shelton
Shading Increases Yield Of Nitrogen-Limited Tropical Grasses, D.W M. Wild, J R. Wilson, W W. Stur, H M. Shelton
IGC Proceedings (1977-2023)
This report summarises current research investigating the enhanced shoot growth and higher nitrogen (N) yield observed in N-deficient tropical grass pastures when moderately shaded. The "shade response" was consistently observed in a number of "run-down" tropical grass pastures, over a range of soil types. White there was evidence of translocation of N from roots of shaded grass, this source did not fully account for the additional N harvested in shoots. A more favourable microclimate at the soil surface-litter layer interface, particularly soil moisture, appeared to be responsible for improved litter breakdown and possibly soil mineralisation activity. The "shade response'' has …
Attainment And Distribution Of Competitive Equilibrium In Tropical Grass-Legume Mixtures, P G. Tow
Attainment And Distribution Of Competitive Equilibrium In Tropical Grass-Legume Mixtures, P G. Tow
IGC Proceedings (1977-2023)
An experiment under controlled conditions, using the de Wit competition model, has provided an explanation of competitive relationships in mixtures of Panicum maximum var. trichoglume (green panic) cv. Petrie and Neontonia wightii cv. Tinaroo glycine. Experiments in a tropical upland environment with summer rainfall dominance (to which they ore adapted) have provided further understanding of their relationships. Over a period of 2 years for well-wafered plants in containers and 4 years in a rain-fed field experiment, competitive gains by one species alternated with-gains by the other, and neither species gained significantly overall. Gains by the grass were favoured by …
Deciphering The Chemistry Of Condensed Aromatic "Black" Carbon And Nitrogen In Amazonian Anthrosols, João Vitor Dos Santos, Aleksandar I. Goranov, Laís G. Fregolente, Marcia C. Bisinoti, Zhenhuan Sun, Klaus Schmidt-Rohr, Patrick G. Hatcher
Deciphering The Chemistry Of Condensed Aromatic "Black" Carbon And Nitrogen In Amazonian Anthrosols, João Vitor Dos Santos, Aleksandar I. Goranov, Laís G. Fregolente, Marcia C. Bisinoti, Zhenhuan Sun, Klaus Schmidt-Rohr, Patrick G. Hatcher
Chemistry & Biochemistry Faculty Publications
Amazonian anthrosols are renowned for their high fertility and dark color, properties primarily attributed to the abundance of condensed aromatic carbon (ConAC) in the soil organic matter. ConAC, commonly referred to as black carbon, play a key role in the stability and nutrient retention of these soils. However, the processes governing the formation of ConAC and its transformation into oxygenated derivatives remain poorly understood. In this study, we used multiple analytical platforms to investigate the chemistry of ConAC-rich humic acids (HA) extracted from Terra Mulata de Indio, a type of Amazonian anthrosol. The results reveal that ConAC are predominantly …
Yield, Composition And In Vitro Digestibility Of Russell Lupin, S M. Kitessa, G D. Hill, A M. Nicol
Yield, Composition And In Vitro Digestibility Of Russell Lupin, S M. Kitessa, G D. Hill, A M. Nicol
IGC Proceedings (1977-2023)
Six harvests were made (at 3-weekly intervals) from spring regrowth of Russell lupin (Lupinus polyphyllus x Lupinus arboreus ) to evaluate changes in yield and nutritive value with plant maturity. Dry matter (DM) yield and neutral detergent fibre (NDF) concentration increased from 40 to 160 g/plant and 24 to 46%, respectively, while nitrogen concentration, in vitro cellulase DM and organic matter digestibility decreased from 4.5-2.4%, 77-56% and 81-55%, respectively, as the lupins matured from late vegetative to hard pod stage. Peak digestible DM (DDM) yields of Russell lupins, at about 90 g/plant, occurred at full bloom and dry pod, …
Efficient Nitrogen Fertilization In Grass Seed Crops With Regard To Soil Mineral Nitrogen Content And Analyzing Grass Tillers In Spring, W Schoberlein, H J. Wahl
Efficient Nitrogen Fertilization In Grass Seed Crops With Regard To Soil Mineral Nitrogen Content And Analyzing Grass Tillers In Spring, W Schoberlein, H J. Wahl
IGC Proceedings (1977-2023)
When applying the Nmln method in grass seed crops analogously lo that in cereal crops we proceed from the experience that for a mean level of mineralisation, the sum total of soil-borne Nm1n available to plants at the beginning of the growth period and Nd Input in the form of fertiliser will provide sufficient N to the crop. The total quantity of mineral soil-borne N and fertiliser N is considered as the nominal value. The required N input can be derived from the difference between nominal value and mineral soil-borne N (Nd = nominal value• Nrnin>· For Dactylis glomerata …
Effect Of Boron And Nitrogen Application On Seed Production Of Lotus Uliginsus, M D. Hare, R A. Carran
Effect Of Boron And Nitrogen Application On Seed Production Of Lotus Uliginsus, M D. Hare, R A. Carran
IGC Proceedings (1977-2023)
Four rates or boron (B) and 2 rates of nitrogen (N) were applied to a mature stand of lotus 11ligi11os11s Schk. cv. Grasslands Maku before flowering, on 10 November 1988. The 2 rntes of N (40 and 80 kg N/ ha) were either applied once or applied at 5 and 10 kg N/ha respectively, at weekly intervals for 8 weeks. N did not increase seed yields. Weekly applications of N significantly (P<0.05) decreased seed yields by 28%. B at 0.91 kg/ha increased seed yields by 7% but this increase was not significant. While seed yields in some tropical legumes may benefit from N application, Grasslands Maku does not benefit. Rather, seed yields are depressed. The application of B did not significantly change seed yields, but more research on B may be needed in areas where B availability is thought to be low.
Litter Dynamics In A Green Panic (Panicum Maximum Var. Trichoglume) Pasture In Queensland, M W. Bligh, R.J K. Myers, D Lamb
Litter Dynamics In A Green Panic (Panicum Maximum Var. Trichoglume) Pasture In Queensland, M W. Bligh, R.J K. Myers, D Lamb
IGC Proceedings (1977-2023)
Decline of productivity of sown pastures is related to nitrogen (N) deficiency in the presence of high C:N ratio litter. We therefore examined litter dynamics in 2 20-year•old green panic pastures (high and low N) on a clay soil. Litter inputs, decomposition in litter bags, and in sit11 changes in undisturbed litter were measured. The standing crop of coarse litter peaked in early summer and troughed in midwinter. The N concentration was 0.60% (C:N 70), At least 1.7 t/ha of dead tops containing 0.44% N entered the litter pool in one year. Annual turnover of coane litter was c. 1.0. …
Effects Of Tillage On Soil Nitrogen And Growth Of Three Rhodes Grass (Chloris Gayana Kunth) Cultivars On A Typical Haplustol, M F. Barbero, C B. Loza, P C. Faustinelli
Effects Of Tillage On Soil Nitrogen And Growth Of Three Rhodes Grass (Chloris Gayana Kunth) Cultivars On A Typical Haplustol, M F. Barbero, C B. Loza, P C. Faustinelli
IGC Proceedings (1977-2023)
In the northern part of the province of Cordoba (32°S), Argentina pasture production is limited by nitrogen availability. The work, using Rhodes ( Chloris gaya11a Ku nth) of 3 origins, evaluated the effect of various dates of surface tillage on the dry matter production and nitrogen content of 3 Rhodes grass cultivars: a local ecotype (Cordobes), cv. Samford and cv. Katambora. Dry matter and nitrogen production was increased in the 3 cultivars when the tillage was done before the rainy season.
Dynamics And Interactions Of Carbon, Nitrogen, Phosphorus And Sulphur Cycling In Grazed Pasture, A K. Metherell, C V. Cole, W J. Parton
Dynamics And Interactions Of Carbon, Nitrogen, Phosphorus And Sulphur Cycling In Grazed Pasture, A K. Metherell, C V. Cole, W J. Parton
IGC Proceedings (1977-2023)
There are close links between the carbon (C), nitrogen (N), phosphorus {P) and sulphur (S) cycles. This is especially evident in legume-based pasture in which ahe application of P and S fertilisers are required to achieve saaisfactory levels of N2 fixation and pasture production The dynamics of the nutrient cycles are controlled largely by the rates of pasture production and consumption, and by the rate of decomposition of organic matter. The CENTURY soil organic matter model integrates climate, soil and management driving variables to predict C, N, P and S dynamics. Simulated effecls of P and S fertiliser on nutrient …
Effects Of Vesicular-Arbuscular Mycorrhiza Inoculation, Nitrogen And Phosphorus On The Growth Of Seedlings Of Sesbania Sesban, E Akeampong, T Mamo
Effects Of Vesicular-Arbuscular Mycorrhiza Inoculation, Nitrogen And Phosphorus On The Growth Of Seedlings Of Sesbania Sesban, E Akeampong, T Mamo
IGC Proceedings (1977-2023)
In the first of two pot experiments, growth of seedlings of Sesbania sesban in response to rates of P (0, 40, 120, 160 and 200 kg/ha) and of N (0 11nd 100 kg/ha) was examined. In a second trial the effect of inoculation with vesicular-arbuscular mycorrhiza (Glomus macrocarpus) and 2 levels (0 and 40 kg/hn) each of triple superphosphnte (TSP) and Egyptian rock phosphate (ERP) were studied. Response to P was linear to 80 kg/ha. Application of N improved the response of seedlings to P through enhanced P and N uptake. Application of N increased plant weight by …
Effect Of Nitrogen Application On Symbiotic Nitrogen Fixation Of White Clover Ecotypes Collected In North-Eastern Japan, K Sugawara, A Nishiwaki, Y Yashima
Effect Of Nitrogen Application On Symbiotic Nitrogen Fixation Of White Clover Ecotypes Collected In North-Eastern Japan, K Sugawara, A Nishiwaki, Y Yashima
IGC Proceedings (1977-2023)
Escaped plants of white clover which could not be identified by variety were collected and were grown in pots filled with a perlite contained nutrient solution in a growlh chamber. On 16 of the collecled plants, the change of the nitrogenase activity by treatments with or without nitrogen (20 ppm N, NaNO3) was measured by gas chromatogrnphy and the variation of peroxidase isozyme was analysed by means of slab acrylamide gel electrophoresis. The studied plants of white clover (Trifolium repens L.) were classified into 5 types by the response pattern of nitrogenase to N applied. Six bands showing peroxidase …
Varietal Differences In Brassica Fodder As Affected By Nitrogen Topdressing And Seeding Date, S H. Moon, H Hirota
Varietal Differences In Brassica Fodder As Affected By Nitrogen Topdressing And Seeding Date, S H. Moon, H Hirota
IGC Proceedings (1977-2023)
Two experiments were carried out both in spring and fall with cultivars of rape (Brassica napus spp.) and C.O. (B. campestris x B. oleracea). Both cullivars showed lillle increase in plant length in spring sowing with nitrogen topdressing, but the increments were higher in earlier topdressing (T l) and later topdressing (T2) than in control in autumn sowing, although the difference was not significant. There was no difference in the number of leaves throughout the growing stages between the N topdressing treatments in spring and autumn sowing. Leaf area was greater in Tl and T2 than in control in early …
Reserve Mobilization During Regrowth After Cutting Of Forage Species: Quantification And Physiological Mechanisms In Ryegrass And Lucerne, A Ourry, J Bigot, T Kim, J Boucaud, J Salette
Reserve Mobilization During Regrowth After Cutting Of Forage Species: Quantification And Physiological Mechanisms In Ryegrass And Lucerne, A Ourry, J Bigot, T Kim, J Boucaud, J Salette
IGC Proceedings (1977-2023)
Time course of remobilisation of reserves was studied during the regrowth of Loli11m perem1e and Medicago sativa by 15N labelling, carbohydrate analyses and by measuring time course of several enzymes activities. When photosynthesis decreased during early regrowth, and consequently reduced availability of carbon skeletons within the plant, both nitrogen (N) uptake (lolium perene) and N2 fixatlon (Medicago saliva) decreased. Nilrogenase, as well as nitrate reductase activities, decreased. Reduction of external N assimilation was compensated for by intensive mobilization of endogenous N in roots of lucerne and in stubble of ryegrass. In the same manner, some of …
Impact Of Intermittent Clipping On Productivity, Forage Quality And Legume Persistence Of Reclaimed Mine Soils, M Collins, H B. Rice, R Turley, W O. Thom
Impact Of Intermittent Clipping On Productivity, Forage Quality And Legume Persistence Of Reclaimed Mine Soils, M Collins, H B. Rice, R Turley, W O. Thom
IGC Proceedings (1977-2023)
The materials used as plant growth media during surface mine· reclamation are frequently low in available N, P and K and are droughtprone. Legumes are included in reclamation seeding mixtures . because of their symbiotic N2-fixation ability but competition may prevent establishment or reduce persistence. A field study was conducted to test the hypothesis that intermittent clipping of these sites would reduce grass competition and thereby maintain legume stands. In 1990 and· 1991, 4 clipping treatments were imposed, providing intervals of 2, 4; and 6 weeks between harvests. Clipping at the 2- or 4-week intervals gave equal yields that were …
Effects Of Nitrogen And Potassium Fertilizers On Forage Yield And Quality Of Dwarf Napiergrass, F H. Hsu, K Y. Hong
Effects Of Nitrogen And Potassium Fertilizers On Forage Yield And Quality Of Dwarf Napiergrass, F H. Hsu, K Y. Hong
IGC Proceedings (1977-2023)
The experiment was conducted to determine effects of nitrogen and potassium fertilisers on forage yield and quality of dwarf napiergrass (Pennisteum purpuretum). Four levels of N (460, 690, 920 and 1150 kg/ha), and 4 levels of K2O (150, 300, 450 and 600 kg/ha), and 1 level of P2O5 (144 kg/ha), were applied. Forage yield, leaf area per tiller, leaf elongation rate and forage quality of dwarf napiergrass were increased when N level applied was increased. Leaf growth, tiller number and forage yield were not affected by K applied. However, Ca and Mg contents in plant were reduced and …
Application Of Dairy Manure On Alfalfa, Stephen J. Herbert, Jayarm Daliparthy, P L.M Veneman
Application Of Dairy Manure On Alfalfa, Stephen J. Herbert, Jayarm Daliparthy, P L.M Veneman
IGC Proceedings (1977-2023)
Applying dairy manure to alfalfa (Medicago sativa L.) as ,in alternative 10 excess application to· corn (Zea mays L.) may reduce nitrate pollution of groundwater. Field experiments were conducted at 2 sites in Massachusetts, USA, lo study the impact or dairy manure application to alfalfa on forage yield, weed infestation· and nitrate movement. Treatments were an unfertilized (no N) check.· plot, low and high manure (112 and 336 kg N/ha/year equivalerit), and low and high N fertiliser (112 and 336 kg N/ha/year from NH4NO3),'. Liquid dairy manure was applied 10 • alfalfa immediately· after 1st· cutting during spring …
Nitrogen And Phosphorus Nutrition Of Digitaria Eriantha: Is It Limited By Absorption Capacity Or Rate Of Supply?, M C. Scholes, R J. Scholes, J Retief
Nitrogen And Phosphorus Nutrition Of Digitaria Eriantha: Is It Limited By Absorption Capacity Or Rate Of Supply?, M C. Scholes, R J. Scholes, J Retief
IGC Proceedings (1977-2023)
Digitaria eriantha was grown from seed collected from low and high nutrient habitats. The plants were grown with either a high or low nutrient supply for 12 weeks. Rates of nitrogen and phosphorus absorption were measured on excised roots using colorimetric assays. The grasses from the low nutrient areas achieved the same maximum uptake rates regardless of the level of N supplied, This was not so for the grasses from the high nutrient site which increased their uptake rates with increased N supply. Plants from the low nutrient site showed markedly increased P absorption when supplied with high levels of …
The Value Of Adapted, Annual Ryegrasses For Subtropical Dairy Production, K F. Lowe, T M. Bowdler, G K. Reason, R J. Moss
The Value Of Adapted, Annual Ryegrasses For Subtropical Dairy Production, K F. Lowe, T M. Bowdler, G K. Reason, R J. Moss
IGC Proceedings (1977-2023)
Cutting and grazing experiments were conducted in a subtropical environment to determine whether a relationship existed between differences measured in ryegrass cultivars from cutting experiments and milk production differences under grazing. Differences in dry mauer (OM) production under cutting between the standard annual ryegrass for the subtropics (Grasslands Tama) and a cultivar selected for superior performance under subtropical conditions (Midmar) averaged 31 %, differences in feed on offer under grazing averaged 21 %, while milk production differences averaged 10% in a 2-year study. The results indicate that increases in OM yield measured in cutting experiments will be consistent wlth differences …
Effects Of Herbicides And Fertilizers On Ragwort (Senecio Jacobaea L.) In Hill Country Pastures, A Rahman, K S. Nicholson, D A. Wardle
Effects Of Herbicides And Fertilizers On Ragwort (Senecio Jacobaea L.) In Hill Country Pastures, A Rahman, K S. Nicholson, D A. Wardle
IGC Proceedings (1977-2023)
A 3-year study was conducted lo determine the influence of 2 herbicides (2,4-D and glyphosate) and 3 fertilisers (containing N, P or K), in conjunctiun with pasture renovation, on ragwort (Senecio jacobaea L.) populations and pasture productivity in a perennial ryegrass-white clover hill country pasture. Glyphosate-treated plots often contained higher ragwort numbers than 2,4-D treated plots, probably because the glyphosate treatment caused greater discontinuity of pasture. Both N and P fertilisers had a consistently strong beneficial effect on pasture, which resulted in substantial inhibition of ragwort populations. During the end of each of the first 2 years of the …
Nitrogen Nutrition Of Brant (Branta Bernicla L.) Grazing On Saltmarsh And Pasture Species, G Q.A Anderson, M Andrews, S M. Percival, J S. Kirby
Nitrogen Nutrition Of Brant (Branta Bernicla L.) Grazing On Saltmarsh And Pasture Species, G Q.A Anderson, M Andrews, S M. Percival, J S. Kirby
IGC Proceedings (1977-2023)
Captive brant Branta bernicla were fed a range of food plants to determine their ability to digest nitrogen and specifically soluble protein. Soluble protein levels in droppings were only a small fraction of those in plants, indicating substantial uptake or conversion. For white clover Trifolium repens L., uric acid content indicated that at least 50% of excreted nitrogen had been metabolised, strongly suggesting that a substantial fraction of soluble protein is utilised by the geese. Carbon/nitrogen ratios increased from plants to droppings while carbon/hydrogen ratios remained nearly constant indicating greater uptake of nitrogen relative to carbon. T. repens was found …
Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad
Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad
IGC Proceedings (1977-2023)
Intensive utilization of autumn regrowth for forage production was compared to other autumn treatments in nine seed production fields of meadow fescue (Festuca pratensis) during 1993-96. Uncut plots without a N application in autumn always had the lowest number of reproductive tillers and the lowest subsequent year seed yields. Intensive utilization of regrowth, by application of 80 kg N ha-1 immediately after seed harvest and forage harvests in September or October, did not have any negative impact on the following yearsí seed yields. Delaying forage harvest from 10 September to 10 October increased forage yields, but lowered the …
Towards A Model For Nitrogen Application To Seed Crops Of Timothy (Phleum Pratense), T S. Aamlid
Towards A Model For Nitrogen Application To Seed Crops Of Timothy (Phleum Pratense), T S. Aamlid
IGC Proceedings (1977-2023)
In seed production experiments with timothy (Phleum pratense L.) split application of 25 kg N ha-1 as early as possible in spring (mean date 17 April) plus 50 kg ha-1 at the start of tiller elongation (mean date 19 May) increased seed yields compared to only one application of 75 or 100 kg N ha-1 in mid-May. On plots not receiving nitrogen until mid-May, the seed yield increase resulting from an additional application of 25 kg N ha-1 at heading (mean date 19 June) could be related to the ratio between measured and critical per cent nitrogen in plant …
Bermudagrass Pastures Under Long-Term Stocking Rates And Fertility Regimes, F M. Rouquette Jr, G R. Smith, V A. Haby
Bermudagrass Pastures Under Long-Term Stocking Rates And Fertility Regimes, F M. Rouquette Jr, G R. Smith, V A. Haby
IGC Proceedings (1977-2023)
After 16 years of grazing ‘Coastal’ and common bermudagrass [Cynodon dactylon (L.) Pers.] pastures each at 3 levels of forage mass, N vs non-N fertilizer was superimposed to assess stand maintenance of bermudagrass and cow-calf performance. After 7 additional years of fertility treatments, N plus overseeded ryegrass (Lolium multiflorum Lam.) provided for 202 days grazing; whereas, K plus overseeded clovers (Trifolium incarnatum L.) and (T. vesiculosum Savi.) provided adequate forage for 179 days grazing. Coastal supported higher stocking rates (2.3 to 7.9 680-kg animal units(AU)/ha) than common bermudagrass (2.0 to 5.3 AU/ha). Suckling calf daily gains …