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Interaction Of Symbiont Alkaloid Accumulation And Growth, L P. Bush, M A. Do Valle Ribeiro, J Hogan, P B. Burruss Ii
Interaction Of Symbiont Alkaloid Accumulation And Growth, L P. Bush, M A. Do Valle Ribeiro, J Hogan, P B. Burruss Ii
IGC Proceedings (1977-2023)
Several classes of alkaloids are present in tall fescue (Festuca arundinacea Schreb.) and the tall fescue-endophyte (Neotyphodium [=Acremonium] coenophialum [Morgan-Jones and Gams] Glenn, Bacon and Hanlin comb.nov.) association. Experiments were conducted to determine the effect of the endophyte on seed germination and seedling growth and to measure the effect of host perloline concentration on endophyte development and loline accumulation. Seed germination was not altered by the presence of the endophyte. In non-stress field conditions of Ireland emergence of first leaf occurred sooner and dry weight was greater in endophyte infected seedlings than endophyte free seedlings, whereas no significant differences …
Enviornmental Quality And Production Efficiency Of Beef Cattle In Tall Fescue Pasture Systems, H A. Fribourg, J C. Waller
Enviornmental Quality And Production Efficiency Of Beef Cattle In Tall Fescue Pasture Systems, H A. Fribourg, J C. Waller
IGC Proceedings (1977-2023)
The establishment, longevity, and utilization of mixed Acremonium coenophialum endophyte-infested (E+) and endophyte-free (E-) tall fescue (Festuca arundinacea Schreb.) pastures were evaluated in three beef production experiments. In Experiment-1, E-, 80% E+ , and a sward of alternate sets of four drill rows of E+ and E- were compared under put-and-take grazing. Stand density of E- was inadequate after 3 yr, but stands and animal performance of the other treatments were similar for 4 yr. Wide strips (6-7 m) of E- fescue were established (Experiment-2) subsequently with no-till methods in E+ fescue sods after destruction of the original vegetation …
The Assimilating And Benefit Of The Chinese Reed Canarygrass (Phalaris Arundinacea L.) On Soil Nutrition, Zhou Bihua, Qi Guang
The Assimilating And Benefit Of The Chinese Reed Canarygrass (Phalaris Arundinacea L.) On Soil Nutrition, Zhou Bihua, Qi Guang
IGC Proceedings (1977-2023)
The Chinese Reed Canarygrass (Phalaris arundinacea L.) is a fine perennial herbage of Gramineae. The wild ripened seeds were collected and sown on the experimental field of the Zhelimu Animal Husbandry College. The former plant of experimental plot is Chinese Crabapple and the cultivating layer is light loam with pH 8.7. The content of nitric N is 33.58 kg/ha, amino N 42.54 kg/ha, organic P 5.6 kg/ha, k 55.97 kg/ha. Clones were set up according to different compositions, that is N, P, K, WP, NPK, CK. the total amount of fertilizer is 23.8 g. The coefficient of absorbing and …
On Designing The Meadow Agrocenosis Of The Polissya (Region) Of Ukraine, V F. Shchesyuk, A Y. Baluta, O V. Shchesyuk
On Designing The Meadow Agrocenosis Of The Polissya (Region) Of Ukraine, V F. Shchesyuk, A Y. Baluta, O V. Shchesyuk
IGC Proceedings (1977-2023)
Geobotanical studies of the natural meadow associations in the wetland areas of the Polissya rivers of the Ukraine were conducted. The Polissya represents a forested region and the rivers include the Western Buh, Vyzhivka, Turia, Stokhid, and Styr. The dominant species is Digrappis arundinacea with Poa palustris, Bromus inermis, Latirus pretense, Latirus palustris, Vicia sepium, and Urtica dioica as codominants. Research demonstrated that the green feed production of Digrappis arundinacea, in combination with Poa palustris, was significantly greater (9.5 t ha-1) than for Digrappis arundinacea alone while the crude protein content of the forage, at early flowering, …
Changes In Soil Fertility And Plant Nutrient Contents In Degraded Tropical Pasture After Renovation, M C. Macedo, V.P. B. Euclides
Changes In Soil Fertility And Plant Nutrient Contents In Degraded Tropical Pasture After Renovation, M C. Macedo, V.P. B. Euclides
IGC Proceedings (1977-2023)
A grazing experiment was conducted on an Oxisol testing five degraded tropical grasses renovated with two levels of fertilizer with the objective to study seasonal changes in plant nutrient contents and soil fertility. Total dry matter availability, green and dead matter availabilities, nutrient concentration in leaf tissue and soil fertility were the parameters measured. Availability of forage and leaf nutrients was significantly dependent on seasonal changes with green matter on offer decreasing over years. Soil fertility increased after renovation and declined thereafter. Soil available-P decreased and it was related to sustainability of green matter on offer. Soil organic matter mineralization …
Productivity Of Fodder Beet On Sandy Soil In Egypt, M A. El-Nahrawy, A Z. Abd El-Halim, H S. Oushy
Productivity Of Fodder Beet On Sandy Soil In Egypt, M A. El-Nahrawy, A Z. Abd El-Halim, H S. Oushy
IGC Proceedings (1977-2023)
Farmyard manure effect on the productivity of five fodder beet varieties grown on sandy soil was investigated during three successive seasons. It was revealed from the results that FYM can effectively convert the non-productive sandy soil to a relatively productive soil. FYM application resulted in an increase of 145, 97, 55, 40, 39 and 43% for dry matter. Fresh matter, germination percentage, plant height, root length and root diameter, respectively, averaged over varieties and seasons.
Brachiaria Brizantha Response To Phosphorus Rates In The Nutrient Solution, F A. Monteiro, R A. Martim, W T. Mattos
Brachiaria Brizantha Response To Phosphorus Rates In The Nutrient Solution, F A. Monteiro, R A. Martim, W T. Mattos
IGC Proceedings (1977-2023)
Seven phosphorus rates in the nutrient solution were studied in a greenhouse experiment for Brachiaria brizantha (Hochst) Stapf. Plants had 54 days of growth and 49 days of regrowth. Significant responses in forage yield, tiller number and root dry weight were found. Plant tops were divided into four parts and phosphorus concentration in each one significantly changed with phosphorus rates. Sampling of the young leaf blades and analyzing for phosphorus is proposed for diagnostic purposes. A critical phosphorus concentration of 1.2 g kg-1 is suggested as the critical level in the young leaf blades.
Bahiagrass Forage Production And Quality As Effected By Municipal Biosolids, R M. Muchovej, J E. Rechcigl
Bahiagrass Forage Production And Quality As Effected By Municipal Biosolids, R M. Muchovej, J E. Rechcigl
IGC Proceedings (1977-2023)
Production of biosolids has been increasing consistently in the last few years. Land application of wastes is being regarded as an alternative means of disposal and as a source of inexpensive fertilizer material. Pastures are particularly attractive in this regard since the areas occupied are extensive and large amounts of fertilizer are required for adequate production. The objective of this study is to investigate the effects of various rates of biosolids on bahiagrass yield and quality. Forage samples were collected from each plot from April to December. Significant increases in dry matter production, crude protein content and in vitro digestibility …
Effect Of N And P Fertilizers On Nutritive Value Of Dwarf Elephantgrass (Pennisetum Purpureum) Cv N-75 Mott, J R. Faria, B Gonzalez, J Faria-Marmoll, D E. Morillo
Effect Of N And P Fertilizers On Nutritive Value Of Dwarf Elephantgrass (Pennisetum Purpureum) Cv N-75 Mott, J R. Faria, B Gonzalez, J Faria-Marmoll, D E. Morillo
IGC Proceedings (1977-2023)
Crude protein (CP), Ca and P concentrations and in vitro dry matter digestibility (IVDMD) of irrigated dwarf elephantgrass (Pennisetum purpureum cv. N-75 Mott) as affected by the factorial combination of N (0, 150, 300 and 450 kg N/ha/year) and P (0, 50 and 100 kg P205/ha/year) fertilization was evaluated in a tropical dry forest in Zulia State, western region of Venezuela. A randomized complete block design with three replications was used. Soil was a low-fertility sandy-loam Udic Paleustalf (pH 6.1). Nitrogen fertilization did not influence (P>0.05) any of the variables. Mean CP, IVDMD, Ca and P were: 8.13, …
Effect Of The N And P On Yield And Sward And Dwarf Elephant Grass Pennisetum Purpureum Cv. Mott., J R. Faria, B Gonzalez, J Faria
Effect Of The N And P On Yield And Sward And Dwarf Elephant Grass Pennisetum Purpureum Cv. Mott., J R. Faria, B Gonzalez, J Faria
IGC Proceedings (1977-2023)
The effect of nitrogen and phosphorus application on yield and sward structure as height and leaf, stem and dead forage composition of dwarf elephant grass (Pennisetum purpureum Schumach) cv. Mott was studied under field conditions and complementary irrigation, during one year at very dry tropical forest with a semiarid climate in Venezuela. The nitrogen (N) and Phosphorus (P) rate were 0, 150, 350, 450, kg ha-1 year and 0, 50 and 100 kg P2O5 ha-1 year respectively. The N rate increased the plant height (81.52 cm), leaf, stem and death production (10, 8.13, and 1.62 t DM ha-1 respectively) …
Field Evaluation Of Soil Acidity Acidity Effects On The Growth Of Annual And Perennial Ryegrasses, N Miles
Field Evaluation Of Soil Acidity Acidity Effects On The Growth Of Annual And Perennial Ryegrasses, N Miles
IGC Proceedings (1977-2023)
Soil acidity limits pasture establishment and productivity in the moister eastern half of South Africa. Sound lime requirement guidelines based on soil test data are required. In the study reported here, lime responses of annual (Lolium multiflorum) and perennial (Lolium perenne) ryegrasses were evaluated in irrigated field trials located on acidic, highly weathered soils. Annual ryegrass (yield response to lime 27 to 32%) was found to be markedly more tolerant of soil acidity than perennial ryegrass (yield response 68%). Acid saturations of up to 20% had little impact on the yield of annual ryegrass, while yield …
Nitrogen Fertilization In Winter Forage Crops In The Southeast Of Buenos Aires Province (Argentina), M A. Marino, A Mazzanti, H E. Echeverria, F Andrade
Nitrogen Fertilization In Winter Forage Crops In The Southeast Of Buenos Aires Province (Argentina), M A. Marino, A Mazzanti, H E. Echeverria, F Andrade
IGC Proceedings (1977-2023)
The potential growth in the winter annual forage crops in the Southeast of Buenos Aires Province (Argentina), is limited by the availability of nitrogen during the winter period. The effect of nitrogen fertilization on growth of the two main winter forage crops: oat (Avena sativa) and annual ryegrass (Lolium multiflorum Lam) was analyzed. Under winter-spring temperatures a higher growth potential was shown by annual ryegrass. The critical N doses were 150 and 100 kg.ha-1 of N for oat and annual ryegrass, respectively. The nitrogen dilution curves and the critical N concentration in the forage were determined. The …
Increased Phosphorus Supply Enhances Water Uptake And Water Use Efficiency In White Clover Under Dry Conditions, D K. Singh, P.W. G. Sale
Increased Phosphorus Supply Enhances Water Uptake And Water Use Efficiency In White Clover Under Dry Conditions, D K. Singh, P.W. G. Sale
IGC Proceedings (1977-2023)
A glasshouse experiment was carried out to determine how increasing rates of P supply (0, 33, 100 and 300 kg P ha-1) influenced the water use efficiency of white clover grown in a P-deficient soil under dry conditions. Increasing the P supply enhanced both shoot dry matter yield and water use by the clover plants. The relatively greater dry matter response meant that water use efficiency also increased with added P. High rates of water extraction by these high-P clover plants resulted in a marked drying of soil. Despite these dry soil conditions there was no adverse effect on growth …
N-P-S Fertilizer Effects On Brute Protein Content In A Native Meadow In Tierra Del Fuego, L San Martino, E.C. E. Livraghi, M Jacob, S San Martino, E.E A. Santa Cruz
N-P-S Fertilizer Effects On Brute Protein Content In A Native Meadow In Tierra Del Fuego, L San Martino, E.C. E. Livraghi, M Jacob, S San Martino, E.E A. Santa Cruz
IGC Proceedings (1977-2023)
Fertilization may have a positive effect in improving forage quantity and quality in natural meadows of Tierra del Fuego. The objective of the present study was to estimate N-P-S fertilizer effects on forage quality. The trial was set up in 1994 on an Entic Haploborol soil characterized by low P availability (12 ppm, Truog), high N content (1.5% total N) and medium acudity (pH 5.9). A Complete Randomized Split Plot Design was used and N-P2O5-S nutrients were applied at a rate of 120-100-50 kg.ha-1 . Monthly mowing began in January and finished in April 1995. CP and IVDMD were determined. …
N-P-S Fertilizer Effects On Herbage Yield And Brute Protein Contents In An Irrigated Perennial Pasture In South Patagonia, L San Martino, H M. Espina, E Cittadini
N-P-S Fertilizer Effects On Herbage Yield And Brute Protein Contents In An Irrigated Perennial Pasture In South Patagonia, L San Martino, H M. Espina, E Cittadini
IGC Proceedings (1977-2023)
Little research has been done to determine the effect of fertilization on irrigated pastures in Santa Cruz (South Patagonia). The objective of the present study was to estimate the effects of NPS fertilizing effects on forage yield and quality. The trial was set up in 1994 on a Borolic Haplargid soil characterized by low N content (0.00875% total N), low P availability (9 ppm Olsen) and medium alcalinity (pH 8.4). Pasture was dominated by tall fescue (95%) with 5% of alfalfa. A Complete Radom Design was used and N-P2O5-S nutrients were applied at rates of 120-100-50 kg.ha-1. Monthly mowing began …
Changes In Soil Microbial Biomass-N Under Ryegrass/White Clover Grazed Pastures Based On Symbiotic N Fixation And Fertilizer N, R Ruz, H Troncoso, L Longeri, E Jahn, I Vidal
Changes In Soil Microbial Biomass-N Under Ryegrass/White Clover Grazed Pastures Based On Symbiotic N Fixation And Fertilizer N, R Ruz, H Troncoso, L Longeri, E Jahn, I Vidal
IGC Proceedings (1977-2023)
Soil microbial biomass nitrogen (BN ) was periodically measured in two pastures a) grazed pastures without N fertilizer and b) grazed pastures receiving 200 kg of fertilizer N per year, respectively, during July 1993 to July 1994. Soil type was a volcanic soil Medial, thermic, Typic Distrandept. BN was highly variable and the two type of pastures showed a similar pattern of distribution, with statistical differences in only three sampling. Values of BN were lower than that found in other studies of temperate regions, but also the BN was significantly higher than the available pool of mineral N, indicating the …
The Effect Of Fertiliser History On Nutrient Accumulation And Plant-Available Nutrient Supply In Legume-Based Pasture Soils, J L. Moir, M J. Hedley, A D. Mackay, R W. Tillman
The Effect Of Fertiliser History On Nutrient Accumulation And Plant-Available Nutrient Supply In Legume-Based Pasture Soils, J L. Moir, M J. Hedley, A D. Mackay, R W. Tillman
IGC Proceedings (1977-2023)
Animal production in New Zealand is dependent on pastoral legumes to build soil nitrogen fertility, which otherwise limits the growth of the major sward component, grass. Traditionally, in order to sustain legume vigour, single superphosphate has been applied to elevate soil phosphorus and sulphur levels. Rarely have either the agronomic or nutrient efficiencies of these systems been assessed. Fourteen hill country pasture sites in three broad rainfall regimes were chosen to assess the effect of contrasting fertiliser histories on soil fertility, in particular nitrogen availability. At each site soil fertility indices and pasture production for the 1993/94 growing season were …
Long Term Effects Of Liming A Basalt-Derived Soil, On Lucerene And Phalaris Production, K.M. F. Reed, J F. Chin
Long Term Effects Of Liming A Basalt-Derived Soil, On Lucerene And Phalaris Production, K.M. F. Reed, J F. Chin
IGC Proceedings (1977-2023)
Lime incorporated into a basalt-derived clay loam lowered exchangeable aluminium in soil. Soil pH was still elevated, 9 years after 2 t/ha of lime was incorporated. With lower rates of lime the density of lucerne plants declined. Lucerne yield more than doubled with lime. After six years, the area was sown to a phalaris-clover pasture. A 15% increase in the yield of phalaris was recorded from limed plots over the next three years. Despite this, 11 years after liming, herbage P concentrations increased with lime, from 0.28% to 0.35%.
Phosphorus Availability, Defoliation Tolerance, And Genetic Differentiation In White Clover, D F. Chapman
Phosphorus Availability, Defoliation Tolerance, And Genetic Differentiation In White Clover, D F. Chapman
IGC Proceedings (1977-2023)
The genetic composition of mixed populations of white clover growing in low fertility, grass-dominant hill pastures was estimated four and eight years after populations were established. Populations were based on an adapted ('Grasslands Tahora') or poorly adapted ('Grasslands Huia') cultivar, and received either no fertiliser, or 35kg P /ha /year. The P response curve of surviving plants was also determined, and compared with plants grown from 'standard' seedlines of the respective cultivars. Between years 4 and 8, the proportion of the populations constituted by plants true-to-type for the sown cultivar remained steady at 56 - 58% for Tahora, but fell …
Potassium Rates For Macrotyloma Axillare Growth, R A. Martim, F A. Monteiro, P.R. L. Portilho
Potassium Rates For Macrotyloma Axillare Growth, R A. Martim, F A. Monteiro, P.R. L. Portilho
IGC Proceedings (1977-2023)
The response of the tropical forage legume macrotiloma guata (Macrotyloma axillare (E. Mey) Verdc) to potassium rates was studied in a greenhouse experiment. The plants were grown in nutrient solution with seven potassium (K) rates, 0; 3.5; 7; 21; 35; 105 and 245 mg l-1 of solution, in randomized complete block design, with four replications. There was significant response of the legume to potassium rates. Considerations are made on the influence of these levels on plant dry matter yield in two harvests, root dry matter production and potassium and magnesium concentrations in the plant tissue.
Phosphorus Use Efficiency For Biomass Production Of Legume Species, A T. Ayala Torales, V A. Deregibus, P R. Moauro
Phosphorus Use Efficiency For Biomass Production Of Legume Species, A T. Ayala Torales, V A. Deregibus, P R. Moauro
IGC Proceedings (1977-2023)
The objective of the experiment was to identify traits associated with the production of plant biomass, and hence with P utilization efficiency, when legume species were fertilized. Red clover (Trifolium pratense) and narrowleaf birdsfoot trefoil (Lotus tenuis) were compared in a greenhouse experiment using phosphorus deficient soils. Three plants grew in pots fertilized with 0, 2, 4, 8, 15, 20, 30 and 40 ppm in soil, in a randomized experimental design. Harvest was made at 60 days from the sowing date. Leaf areas, shoot and root biomass, and tissue phosphorus contents were measured. Results showed that …
A Review Of Centrosema Pascuorum (Centurion) Cvv. Cavalcade And Bundey As A Pasture Legume In The Ley Farming System Studies In North West Australia, K Thiagalingam, D Zuill, T Price
A Review Of Centrosema Pascuorum (Centurion) Cvv. Cavalcade And Bundey As A Pasture Legume In The Ley Farming System Studies In North West Australia, K Thiagalingam, D Zuill, T Price
IGC Proceedings (1977-2023)
Field experiments and commercial experience with the pasture legume Centrosema pascuorum (centurion) in the Katherine and Douglas Daly districts of the Northern Territory over the past ten years were reviewed. Results show that cultivars of this species (Cavalcade and Bundey) have good potential for improving both soil fertility and the quality of dry season forage (as hay or grazing) for cattle in mixed farming systems in the semi-arid tropics of north west Australia.
Effect Of Plant Age And N And P Fertilization On Mineral Composition Of Andropogon Gayanus, D E. Morillo, A Caraballo, J Faria-Marmoll, L R. Mcdowell
Effect Of Plant Age And N And P Fertilization On Mineral Composition Of Andropogon Gayanus, D E. Morillo, A Caraballo, J Faria-Marmoll, L R. Mcdowell
IGC Proceedings (1977-2023)
Mineral concentrations of Andropogon gayanus Kunth, as affected by age of regrowth, 42 and 63 days (six and four cuttings); rate (kg/ ha/year) of N fertilizer, 0, 100 and 200, and of P2O5, 0 and 75, were evaluated on a sandy-loam Aridisol (pH 5.5) in Venezuela, using a split-split-plot experimental design with two replications. Forage mineral concentrations did not differ (P>0.05) among ages. Mean Ca, P, Mg, Na were: 0.20, 0.11, 0.10 and 0.029 %, and regarded as deficient for ruminants. Only K (1.21 %) was considered adequate. Mean Fe, Zn, Cu, Mn and Co were 57, 24, 2.7, …
Seasonality In The Response Of Perennial Grass-Clover Pastures To Phosphorus Fertiliser, A K. Metherell, A C. Mckenzie
Seasonality In The Response Of Perennial Grass-Clover Pastures To Phosphorus Fertiliser, A K. Metherell, A C. Mckenzie
IGC Proceedings (1977-2023)
Pasture dry matter yields from individual cuts of multi-year phosphorus (P) fertilizer field trials were analyzed for evidence of consistent seasonal trends in the response to P. The relative response to P was greatest in the late autumn - winter period, with the seasonal variation in relative yield being greater where soil fertility and mean annual relative yields were lowest.
Interaction Of Endomycorrhizal Fungi And Phosphate On Neonotonia Wightii, Lackey, V T. Paulino, O.M. A.A. Ghisi, M.A. C. Lucena, M J. Valarini, J C. Werner
Interaction Of Endomycorrhizal Fungi And Phosphate On Neonotonia Wightii, Lackey, V T. Paulino, O.M. A.A. Ghisi, M.A. C. Lucena, M J. Valarini, J C. Werner
IGC Proceedings (1977-2023)
This experiment was carried out in greenhouse condition, to study the effect of four phosphorus levels (20, 80, 140 and 200 kg of P2O5/ ha) with or without fungi mycorrhizal inoculation (Acaulospora longula + A. morrowae ). Five accessions of Neonotonia wightii (Wightii & Arn) Lackey (perennial soyabean) were studied: Malawi, Tinaroo, NO1264, NO409 and NO 250. The growth of Neonotonia was improved by the phosphorus fertilization.The effect of VAM inoculation was greater in the lower levels of P fertilization reducing its effect in the higher levels of P applied. The presence of soluble P induced higher N accumulation …
Effects Of Agropastoral Systems On Microbially Bound Phosphorus In Low P Acid Soils, A Oberson, D K. Friesen, C Morel, H Tiessen, E Frossard
Effects Of Agropastoral Systems On Microbially Bound Phosphorus In Low P Acid Soils, A Oberson, D K. Friesen, C Morel, H Tiessen, E Frossard
IGC Proceedings (1977-2023)
The effect of agropastoral systems replacing native savanna on microbially bound phosphorus (Pmic) in low P acid soils was investigated. Chloroform released P (PChl) was measured to estimate Pmic. In a long-term improved pasture experiment, PChl was higher in grass-legume (GL) than grass-only pasture (GO). Although the P balance was slightly higher in GO than in GL, available P contents followed the same trend as PChl suggesting that the presence of legumes enhances the maintenance of P fertility. In a rice-pasture system, PChl was higher than under rice monocrop indicating an effect of the cropping system on PChl that goes …
Effect Of Slurry Application On Cell Wall Components And Silage Intake By Sheep Of Italian Ryegrass And Triticale, H Kawamoto, N Shimizu, R Uegaki, R Kobayashi
Effect Of Slurry Application On Cell Wall Components And Silage Intake By Sheep Of Italian Ryegrass And Triticale, H Kawamoto, N Shimizu, R Uegaki, R Kobayashi
IGC Proceedings (1977-2023)
The study was to elucidate the effect of application of slurry manure from dairy cows on chemical components, the rumen degradation characteristics and silage intake by sheep of Italian ryegrass (Lolium multiflorum Lam.) and Triticale ( rye-wheat hybrid). The amounts of application of slurry were 0, 50, 100 and 150 t/ha. The increasing level of slurry application resulted in a decrease of lower digestible cell wall and an increase of degradation rate. The silage of 150 t /ha treatment was significantly more consumed by sheep than the other treatments (p<0.05). The changes in cell wall components in both quantity and quality by the slurry application were advantageous to the increase of voluntary dry matter intake of the forage.
Raster Map For Prediction Of Heading Date Of Timothy By Nonparametric Dvr Method, T Saigusa, K Nakashima, N Noshiro, M Tsutsumi
Raster Map For Prediction Of Heading Date Of Timothy By Nonparametric Dvr Method, T Saigusa, K Nakashima, N Noshiro, M Tsutsumi
IGC Proceedings (1977-2023)
A system for making a raster map for predicting the heading date of timothy (Phleum pratense L.) at first cutting for every 1km2 plot was developed to supply information for smooth harvest of forage of good quality in a dairy farming area of Hokkaido. Daily mean air temperature for every 1km2 plot was estimated with data from a network of meteorological observatories and data base of the Japan Meteorological Agency. Day length could be calculated from latitude and calendar day. Using these two environmental factors, heading date of timothy at first cutting for each area was predicted by nonparametric DVR …
Long-Term Effects Of Co2 Enrichment And Temperate Increase On Forage Quality In A Temperate Grass, J F. Soussana, J M. Besle, I Chabaux, P Loiseau, P C. De Faccio Carvalho
Long-Term Effects Of Co2 Enrichment And Temperate Increase On Forage Quality In A Temperate Grass, J F. Soussana, J M. Besle, I Chabaux, P Loiseau, P C. De Faccio Carvalho
IGC Proceedings (1977-2023)
Perennial ryegrass swards were grown during two years at two N fertilizer supplies in elevated (700 ppm) or ambient atmospheric CO2 concentration at outdoor temperature and at + 3°C in elevated CO2. Elevated CO2 and temperature increase had only minor impacts on the digestibility and on the fiber composition of the cut material. On average, the water soluble carbohydrate concentration of the leaf laminae was doubled in elevated CO2, whereas a 3°C temperature increase reduced this concentration by 25 %.
Growth Response Of Australian Temperate Pasture Species To Co2 Enrichment, T P. Bolger, J M. Lilley, R M. Gifford, J R. Donnelly
Growth Response Of Australian Temperate Pasture Species To Co2 Enrichment, T P. Bolger, J M. Lilley, R M. Gifford, J R. Donnelly
IGC Proceedings (1977-2023)
Growth responses to a doubling of the atmospheric CO2 concentration for 15 species represented in temperate pastures of southern Australia were investigated in a glasshouse experiment. The final dry weight increase due to CO2 enrichment averaged 34% across species but varied widely. The variation in CO2 response was greater among species within botanical groups than it was among groups. The CO2 response of a number of ‘desirable’, but also a number of ‘undesirable’ species was greater than the mean response, suggesting that these species may increase their proportion in pastures as atmospheric CO2 rises. Our results do not support the …