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Articles 31 - 60 of 312
Full-Text Articles in Agronomy and Crop Sciences
Physiological Ageing In Young Leaves Of Digitaria Eriantha (Steud), M M. Wolfson, C F. Cresswell
Physiological Ageing In Young Leaves Of Digitaria Eriantha (Steud), M M. Wolfson, C F. Cresswell
IGC Proceedings (1977-2023)
In a previous paper, Wolfson and Cresswell (1985) demonstrated that single leaf photosynthetic rates measured on successive leaves near the meristematic tip, in plants treated with different forms and concentrations of nitrogen, decreased reaching very low levels after four month's growth, irrespective of the treatment applied. As the leaves were considered to be young and they were not shaded in any way, it was expected that the photosynthetic rate would remain fairly high throughout the growing period. Therefore it was suggested that the leaves underwent some form of programmed metabolic ageing even though they were still structurally and physiologically young. …
Stand Characteristics Of Irrigated Cocksfoot Regrowth And Leaf Area Increasing, M Duru, A Langlet, S Rouzies
Stand Characteristics Of Irrigated Cocksfoot Regrowth And Leaf Area Increasing, M Duru, A Langlet, S Rouzies
IGC Proceedings (1977-2023)
For grasses, high leaf area index (LAI) extension rate is necessary to intercept much radiation and to increase the growth rate (Gosse et al., 1986). The LAI extension rate depends on stand status just after the cut : tiller density (Nelson and Zarrough, 1981), residual leaf area and reserves level (Smith, 1974), plant nutrition (nitrogen especially). We study the setting up of LAI for vegetative regrowths according to nitrogen nutrition and different stand status : tiller number and size.
Variability Of Leaf Area Index Extension Rate On Permanent Grasslands, M Duru
Variability Of Leaf Area Index Extension Rate On Permanent Grasslands, M Duru
IGC Proceedings (1977-2023)
Canopy growth is related to solar radiation intercepted (PARa), (Greenwood et al., 1986; Gosse et al., 1986). The canopy interception efficiency ( i: i = P ARa/P ARc) is related to leaf area index (LAI). In spring, for grasses i: i = 70 % when LAI = 2 (Lemaire, 1985). The faster the LAI extension rate is, the greater the dry matter yield is. We study nitrogen and grassland type effects, with phosphopotassic soil fertility level and botanical criterion.
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 …
The Interaction Of Nitrogen And Potassium Nutrients In Increasing Growth, Yield, And Quality Of Sweet Corn Products, Risqa Naila Khusna Syarifah, Purwanto, Agus Sarjito, Hana Hanifa, Lafi Na'imatul Bayyinah
The Interaction Of Nitrogen And Potassium Nutrients In Increasing Growth, Yield, And Quality Of Sweet Corn Products, Risqa Naila Khusna Syarifah, Purwanto, Agus Sarjito, Hana Hanifa, Lafi Na'imatul Bayyinah
Jurnal Kultivasi
Fertilizer application is a strategy that can be used to increase sweet corn production and maintain environmental balance. This research aims (i) to determine the optimal dose of nitrogen and potassium fertilizers for sweet corn production; (ii) to study the agronomic and physiological responses of sweet corn plants at different nitrogen and potassium dose; and (iii) to determine the nitrogen (N) and potassium (K) nutrient uptake and efficiency by sweet corn at different fertilizer doses and their interactions on yield and yield quality. The research was conducted from March to November 2022 in the Faculty of Agriculture, Universitas Jenderal Soedirman. …
Variation In Response To Phosphorus Among Sweetpotato (Ipomoea Batatas L.) Cultivars, Jeffrey Cole Denis Gregorie
Variation In Response To Phosphorus Among Sweetpotato (Ipomoea Batatas L.) Cultivars, Jeffrey Cole Denis Gregorie
LSU Doctoral Dissertations
Phosphorus (P) is essential for plant growth and is often a major limiting nutrient in agriculture. In sweetpotato (Ipomoea batatas), studies on the role of P on storage root yield have been limited because of the lack of response and inconsistent results across cultivars and years. Growing evidence shows that current phosphate (Pi) fertilizer rates can be reduced while maintaining productivity. Newly published molecular evidence shows differential expression of phosphate starvation response genes among sweetpotato cultivars, further supporting the hypothesis of cultivar-specific Pi sensitivity. The research herein sought to characterize root system architecture and yield response to Pi …
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 …
Winter Hay-Feeding Effects On Soil Properties In A Rotationally Grazed Pasture System In The Ozark Highlands, Larry Berry, Kristofor R. Brye, Andrew Sharpley, Ron Morrow, Dirk Phillip, Tim A. Glover, James M. Burke, Mike B. Daniels
Winter Hay-Feeding Effects On Soil Properties In A Rotationally Grazed Pasture System In The Ozark Highlands, Larry Berry, Kristofor R. Brye, Andrew Sharpley, Ron Morrow, Dirk Phillip, Tim A. Glover, James M. Burke, Mike B. Daniels
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Soil nutrient management for pastures in Arkansas often ignores nutrients applied from feeding hay to cattle. Discounting nutrient contributions from hay may increase the likelihood of unnecessary fertilizer over-application. This study evaluated the effects of unrolling bales (unroll fed, UF) and using a ring feeder (ring fed, RF), compared to an unamended control, on changes in soil properties in the top 4 inches in a rotationally grazed, beef [red angus (Bos taurus)] pasture on silt-loam soils in northwest Arkansas. Forty-six cow-calf pairs were fed hay at 6.6 tons acre(-1) year(-1) (14.8 Mg ha(-1) year(-1); dry-weight basis) from December to February …
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 …
Root Decomposition And Nutrient Dynamics In Multifunctional Forage-Biomass Buffer-Strip Systems, Helen C.S. Amorium, Amanda J. Ashworth, Taylor C. Adams, Mary C. Savin, Philip A. Moore Jr
Root Decomposition And Nutrient Dynamics In Multifunctional Forage-Biomass Buffer-Strip Systems, Helen C.S. Amorium, Amanda J. Ashworth, Taylor C. Adams, Mary C. Savin, Philip A. Moore Jr
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Perennial crops are thought as a solution for enhancing food security and providing ecosystem services under a changing climate, including forage-biomass production, reduced erosion and nutrient leaching, and soil C accumulation. However, the drivers of root decomposition and C allocation in perennial multifunctional forage-biomass buffer-strips as affected by fertility management are poorly elucidated. Thus, study objectives were to assess root decomposition and soil CO2 efflux on switchgrass (Panicum virgatum L.), eastern gamagrass (Tripsacum dactyloides L.), silphium (Silphium integrifolium Michx.), and intermediate wheatgrass Kernza (Thinopyrum intermedium [Host] Barkworth & D.R. Dewey) treated with poultry litter (PL) relative to the unfertilized control. …
Soybean Seed Yield Distribution Within The Canopy As Affected By Nitrogen Supply, Lucia Bonfanti
Soybean Seed Yield Distribution Within The Canopy As Affected By Nitrogen Supply, Lucia Bonfanti
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Soybean [Glycine max (L.) Merr.] seed yield is influenced by the seasonal availability of resources (i.e., nutrients, light, and water). While nitrogen (N) supply is becoming a soybean yield-limiting factor, the N-induced effect in seed yield components is still unclear. The objective of this research was to assess the effect of N supply on soybean yield components distribution within the canopy. A Full-N treatment, which provided the crop with ample N supply, was compared against a Zero-N treatment in which the crop relied on soil N and biological N fixation at nine high-yielding irrigated soybean environments in Nebraska, with …
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 …