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Articles 1351 - 1380 of 12201
Full-Text Articles in Entire DC Network
A Study Of Agronomic Factors Affecting The Yield And Quality Of Forage Maize In Ireland, G P. Keane
A Study Of Agronomic Factors Affecting The Yield And Quality Of Forage Maize In Ireland, G P. Keane
IGC Proceedings (1977-2023)
The objectives of these studies were to examine the effects of sowing date and plastic film on the yield and quality of forage maize (Zea mays L) in a marginal maize growing area. The response, in DM yield terms, to sowing in early April rather than early May differed in 1995 and 1996, but early sowing in all cases improved quality parameters. The use of plastic film, whether perforated or complete cover treatments, gave substantial yield increases in some instances, and always improved quality parameters. Perforated plastic gave highest DM yield increases with late April or early May sowings, …
Utilizing Soil And Plant Analysis For The Prevention Of Cobalt Deficiency In New Zealand, M B. O'Connor, J Waller, J Morton, M F. Hawke
Utilizing Soil And Plant Analysis For The Prevention Of Cobalt Deficiency In New Zealand, M B. O'Connor, J Waller, J Morton, M F. Hawke
IGC Proceedings (1977-2023)
The addition of trace elements to fertiliser is a well accepted method of overcoming deficiencies in plants and animals in New Zealand. Cobalt sulphate, for instance, is commonly added to fertiliser to prevent Co deficiency in grazing animals. New Zealand farmers annually apply 130 tonnes of cobalt sulphate to permanent pastures at rates up to 350g/ha/annum. Cobalt deficiency is normally diagnosed by the analysis of animal tissues or plant material. Soil Co analyses have traditionally been considered unsatisfactory for diagnostic purposes. Research, however, suggests that the relationship between soil and plant Co for particular soils is sufficiently promising to consider …
Genetic Variability Of Ruminal Starch Degradation Of Corn Harvested At Two Silage Maturities, C Philippeau, M Champion, B Michalet-Doreau
Genetic Variability Of Ruminal Starch Degradation Of Corn Harvested At Two Silage Maturities, C Philippeau, M Champion, B Michalet-Doreau
IGC Proceedings (1977-2023)
This trial was carried out to determine the influence of genotype and maturity stage on ruminal starch degradation of corn harvested at silage maturity. Two types of corn (Zea mays L.), differing in their endosperm texture, flint or dent, were harvested at 30 and 35 % whole plant DM. The degradation rate in the rumen of grains (oven dried at 40°C and ground through a 3-mm screen) was determined by the in situ technique. Mean ruminal starch degradability was 69 %. With maturity, the content of grain in the whole plant increased and ruminal starch degradability decreased (15 points). Starch …
Estimation Of Organic Matter Digestibility And Me Content In Ruminant Feeds From In Vitro Gas Production, H Steingass, K P. Aiple, W Drochner
Estimation Of Organic Matter Digestibility And Me Content In Ruminant Feeds From In Vitro Gas Production, H Steingass, K P. Aiple, W Drochner
IGC Proceedings (1977-2023)
Cumulative gas production from incubation of feedstuffs with rumen liquor or a fresh faecal suspension as inoculum in vitro together with crude nutrient composition can be used to predict organic matter digestibility and metabolizable energy content of ruminant feeds with high accuracy. In this study, prediction equations were derived for roughages using 110 samples with known in vivo digestibility. It can be demonstrated, that the accuracy of prediction of the gas production method is better compared with a pepsin-cellulase procedure and that the use of a faecal suspension as inoculum is a useful alternative when fresh rumen liquor is not …
Effects Of Mixture Rates And Cutting Dates On The Forage Yield And Quality Of Vetch-Triticale Mixtures And Their Seed Yields Under Lowland Conditions Of Cukurova, T Tukel, E Hasar, R Hatipoglu
Effects Of Mixture Rates And Cutting Dates On The Forage Yield And Quality Of Vetch-Triticale Mixtures And Their Seed Yields Under Lowland Conditions Of Cukurova, T Tukel, E Hasar, R Hatipoglu
IGC Proceedings (1977-2023)
This study was conducted to determine the effects of mixture rates and cutting dates on the forage yield and quality of vetch-triticale mixtures. Mixtures containing 50% vetch + 50% triticale or 25% vetch + 75 % triticale can be preferred for a high forage yield and the cutting should be performed at the beginning of the pod stage in terms of herbage and hay yield unless there is a necessity for the early harvest. Even if 100 % triticale provided the highest yield 0.98 tonnes/ha of crude protein, the mixture with 25 % +75 % triticale giving 0.96 tonnes/ha yield …
Functions Of Permanent Grassland In The Process Of Feed Base Optimization Of Dairy Farms From Great Poland Region, P Golinski
IGC Proceedings (1977-2023)
The objective of this paper was the determination of permanent grassland functions at optimization of the feed base of dairy farms in the region of Great Poland using linear programming against the background of newly developing conditions of market economy. The important factor leading to significant improvement of financial situation of farms was finding them a model of cattle feeding based on feed from permanent grasslands. However, permanent grasslands in Great Poland, when compared with arable lands, are characterized, in their models, by a low dual value. This can be attributed mainly to a low milk price and low productivity …
Changes In Agronomic Characteristics With Maturity Of Erianthus Ik-76-110, P Mislevy, F G. Martin, M B. Adjei, J D. Miller
Changes In Agronomic Characteristics With Maturity Of Erianthus Ik-76-110, P Mislevy, F G. Martin, M B. Adjei, J D. Miller
IGC Proceedings (1977-2023)
Optimal production of energy from biomass necessitates the identification and management of high yielding plant entries. Erianthus arundinaceum (Retz) Jesw. IK-76-110 was tested to determine the influence of harvest treatments at heights of 1.2, 2.5, and 3.7 m and mature in October (4.9 m), and mature in December (4.9 m and in flower) on agronomic characteristics from 1987 to 1990. All treatments received 25 kg ha-1 P and 93 kg ha-1 yr-1 K in one spring application and 336 kg ha-1 N in split applications applied prior to the growth of each harvest. An additional October treatment at the mature …
Pearl Millet: A New Green Fodder Crop In Korea, B H. Choi, K Y. Park, R K. Park
Pearl Millet: A New Green Fodder Crop In Korea, B H. Choi, K Y. Park, R K. Park
IGC Proceedings (1977-2023)
Pearl millet (Pennisetum americanum (L.) Leeke) has been recognized in Korea since 1985, as an important new forage crop of high quality and yield. Suwon 1, pearl millet hybrid, was the best of 20 hybrids examined in Suwon, giving 150t/ha (three cuttings) of green fodder. The pearl millet hybrid was higher in green fodder yield than corn and sorghum/sudan grass hybrids. Leaf area index was 28.8 for three cuttings of pearl millet, with 5.8 for one cutting of maize, and 19.5 for three cuttings of sorghum/sudan grass. Crude protein content was 16.3% for pearl millet, 6 and 5% higher …
Modelling Feed Resources Budgets In The Moist Savannahs Of West Africa, A Naazie, J W. Smith
Modelling Feed Resources Budgets In The Moist Savannahs Of West Africa, A Naazie, J W. Smith
IGC Proceedings (1977-2023)
A deterministic model was developed to evaluate the adequacy and utilization of ruminant livestock feed resources in the moist savannahs of W. Africa. Changes in land cropped and available as range, were used to project changes in feed resources over time and to evaluate whether these feed resources were adequate for the expected numbers of livestock in the region. Ignoring crop residues as feed resources would result in feed shortages especially in the drier northern parts of the moist savannahs. If 50% of the residues could be used as feed, feed shortage would be unlikely irrespective of area cropped. In …
Participative Management And Rehabilitation Of The Village Common Pastures In The Central Highlands Of Turkey: Importance Of Diagnostic Surveys In Project Planning And Execution, H K. Firincioglu, S Christiansen, S Unal, D Ozturk, H Basaran
Participative Management And Rehabilitation Of The Village Common Pastures In The Central Highlands Of Turkey: Importance Of Diagnostic Surveys In Project Planning And Execution, H K. Firincioglu, S Christiansen, S Unal, D Ozturk, H Basaran
IGC Proceedings (1977-2023)
Most of the pastures in the central highlands of Turkey have been replaced by cereal production over the last 50 years. Also, the mismanagement of the existing pastures, i.e., early grazing and over stocking of animals, has resulted in severe degradation of pasture species. A study, involving a multidisciplinary approach, was initiated and included botanical and socio-economic surveys, improvement of village-based feed resources, and realistic livestock feeding schemes to put limited feed resources to best use. Results of socioeconomic survey studies in selected villages are presented as prerequisite information for initiation of a forage, livestock and range rehabilitation project.
Use Of Grazing Animals In Re-Seeding Degraded Marginal Lands In Northern Syria, F Ghassali, A E. Osman, P S. Cocks
Use Of Grazing Animals In Re-Seeding Degraded Marginal Lands In Northern Syria, F Ghassali, A E. Osman, P S. Cocks
IGC Proceedings (1977-2023)
Seed mixture of sixteen native legumes were fed to sheep as a single meal and their passage through the animals was monitored in the faeces. The same mixture was used in a field experiment to improve degraded pasture. Over two hundred sheep were allowed to graze the improved pasture and rest on a nearby un-improved (target) pasture during four days. Results showed that legumes with smaller seeds were able to pass through the animals undamaged compared with large seeded species. The field study provided confirmation of the animal feeding study and provided evidence that grazing animals can help in rehabilitation …
Integrated Management Of Natural Forage Resources In A Tropical Humid Savannah Of West Africa, Ph Lecomte, Ph Hellemans, A Buldgen
Integrated Management Of Natural Forage Resources In A Tropical Humid Savannah Of West Africa, Ph Lecomte, Ph Hellemans, A Buldgen
IGC Proceedings (1977-2023)
In the practise of extensive cattle rearing in the Guinean low altitude savannah, coupled with a poor knowledge or appreciation of the plant communities, disturbs the natural equilibrium of vegetation. A carefully designed land management program and the establishment of indicators to monitor any changes are crucial for ensuring production capacity. The study suggests the integration into a Geographical Information System of a set of field indicators defined for a typical savannah of the area in question. These indicators take into account throughout the seasons, data on the climate, the natural environment, the productivity value of vegetation and the risk …
Structure, Productivity And Animal Utilization In A Communal Pasture In The Basque Country (Northern Spain), I Albizu, G Besga, M Rodriquez, M Onaindia, M Domingo, I Amezaga
Structure, Productivity And Animal Utilization In A Communal Pasture In The Basque Country (Northern Spain), I Albizu, G Besga, M Rodriquez, M Onaindia, M Domingo, I Amezaga
IGC Proceedings (1977-2023)
The goal of this study was to determine the structure, productivity and utilization of mountain communal pastures of the Gorbea area in 1994. The area was classified in four zones according to topographic position and improvement activities: north slope brush removed, summit, south slope 50% brush, and south slope brush removed. Ecological profiles were used to relate the most abundant species to soil P and K contents at the different zones. Exclosure cages were used to estimate potential productivity, botanical composition and pasture utilization. Soil P and K contents are the parameters that relate best to floristic composition, being Agrostis …
Traditional Grassland And Fodder Management Systems In Tanzania And Potential For Improvement, R M. Otsynia, I Essai, D Asenga
Traditional Grassland And Fodder Management Systems In Tanzania And Potential For Improvement, R M. Otsynia, I Essai, D Asenga
IGC Proceedings (1977-2023)
The “Ngitiri” fodder conservation system was developed by the Sukuma agro-pastoralists as a strategy to alleviate acute dry season fodder constraints. This traditional agroforestry system provides the basis and opportunities for development of improved silvipastoral systems. Ngitiri is a major source of dry season fodder supply for livestock and thatch for roofing. The system is widespread in the Sukuma landuse system in central Tanzania. This paper presents the scope and importance of the Ngitiri system, management aspects, constraints, and farmers’ perceptions on improvement. Implications for agroforestry technology development in the Sukuma agropastoral system are also discussed.
Overseeding Methods For Communal Grassland, L Tahtacioglu, A Mermer, M Avci
Overseeding Methods For Communal Grassland, L Tahtacioglu, A Mermer, M Avci
IGC Proceedings (1977-2023)
Two establishment methods, cultivator+roller and grassland drill, in combination with four plant mixtures were evaluated for the improvement of degraded communal grassland in two provinces of Eastern Anatolia. The establishment had been satisfactory with both methods and no significant differences were observed between two overseeding methods. Sainfoin, alfalfa, smooth brome and crested wheatgrass were used in this work and plant mixtures consisted of one legume and one grass species. Compatibility of introduced seedlings with existing vegetation was very weak. Although, the contribution of introduced plant mixtures to DM yield was significantly higher under protected condition, the survival and regeneration rates …
The Effects Of Topographical Factors On Forage And Grazing Periods And Carrying Capacity In Eastern Anatolia Region Of Turkey, Ali Koc, Ahmet Gokkus
The Effects Of Topographical Factors On Forage And Grazing Periods And Carrying Capacity In Eastern Anatolia Region Of Turkey, Ali Koc, Ahmet Gokkus
IGC Proceedings (1977-2023)
In this study, natural pastures were selected for floristic and grazing measurement in toeslope, summit, footslope, and shoulder of four position with altitudes ranging between 2000-2500 m in 1992 and 1993. While the longest green forage periods were recorded for footslope, summit and northern faces, the longest dry forage periods were in the south and west sites. Duration of grazing period ranged between 120 and 140 days depending on climatic and topographical factors. Grazing period was the longest in the southern footslope whereas it was shortest in the summit and northern shoulder. Grazing area for a livestock unit (LU) needs …
Sward Height Effects On Sward Composition And Animal Performance In Grass/Clover Swards Co-Grazed By Sheep And Goats, M Del Pozo, A Martinez, K Osoro
Sward Height Effects On Sward Composition And Animal Performance In Grass/Clover Swards Co-Grazed By Sheep And Goats, M Del Pozo, A Martinez, K Osoro
IGC Proceedings (1977-2023)
A mixed herd of yearling cashmere bucks plus Gallega and Lacha ewes rearing single lambs continuously grazed lowland perennial ryegrass (Lolium perenne) / white clover (Trifolium repens) swards on two contrasting sward surface heights of 8.3 (High) or 5.9 cm (Low) over a 100-day spring grazing period. Performance results showed that ewes and bucks had respectively an extra 2.6 and 2.0 kg of liveweight gain in the High height treatment while lambs replenished 185 (High) and 198 (Low) g of daily liveweight. Significant increases of live clover occurred in both sward height treatments and that was …
Dry Matter Degradability Of Red Clover (Trifolium Pratense L.) Grown At Different Altitudes Tested With Rumen Fistulated Rams, M Knezevic, J Leto, V Kozumplik, I Pejic
Dry Matter Degradability Of Red Clover (Trifolium Pratense L.) Grown At Different Altitudes Tested With Rumen Fistulated Rams, M Knezevic, J Leto, V Kozumplik, I Pejic
IGC Proceedings (1977-2023)
Among ecological factors altitude can have significant influence on forage dry matter degradability. Red clover is a very important forage species in hilly-mountain regions. Its response in dry matter degradability to different altitudes has been little studied. In this experiment degradability of six red clover cultivars grown at two different altitudes (123 and 650 meters above the sea level) was studied by using rumen fistulated rams (in sacco technique). The clover samples for the degradability determination were taken from the first cut done at the beginning of flowering at each altitude. The experiment was organised as tree factorial CRD. Five …
Utilization Of Rumen Evacuation And In Situ Methodology To Study Mineral Element Characteristics Of Bromus Inermis, D T. Hickok, R J. Rasby, D R. Brink, P A. Olson, P R. Martin
Utilization Of Rumen Evacuation And In Situ Methodology To Study Mineral Element Characteristics Of Bromus Inermis, D T. Hickok, R J. Rasby, D R. Brink, P A. Olson, P R. Martin
IGC Proceedings (1977-2023)
Mineral element characteristics of Bromus inermis were determined in 2 week intervals from May 15 to October 15 in a four-year study. Clipped samples were separated to leaf and stem fractions. In year 4, 3 ruminally fistulated cows were used to determine diet selection 6 times during the growing season, and were used to determine in situ mineral disappearance of clipped grass. Based on rumen evacuation and in situ methodology elemental concentrations in Bromus inermis exhibited seasonal flux and in the conditions of this study cows did not select a diet different from clipped samples in elements other than Fe …
Anatomy Of Forage Plant Parts In Relation To Digestion, P Rezvani Moghaddam, D Wilman
Anatomy Of Forage Plant Parts In Relation To Digestion, P Rezvani Moghaddam, D Wilman
IGC Proceedings (1977-2023)
The objective of this study was to contribute some quantitative information regarding the proportion of cell types and the thickness of cell walls in different plant parts of three major forage species, lucerne (Medicago sativa L.), tall fescue (Festuca arundinacea Schreb.) and maize (Zea mays L.). All plant parts examined contained a significant proportion of cell types with walls which appeared too thick to be completely degraded during the time which plant particles are likely to spend in the rumen; this applied particularly to lucerne stems and maize leaf blades.
Recent Developments In The Use Of Near Infra-Red Spectroscopy For The Evaluation Of Grass Silage, N W. Offer, D S. Percival, C Thomas
Recent Developments In The Use Of Near Infra-Red Spectroscopy For The Evaluation Of Grass Silage, N W. Offer, D S. Percival, C Thomas
IGC Proceedings (1977-2023)
This work assessed the potential of near infra-red spectroscopy (NIRS) to predict the voluntary intake and fermentation characteristics of grass silage. NIRS spectra were obtained from dried milled (Dry) or fresh samples by two methods (Wet1 - vertical transport mechanism and Wet2 - rotating cup drawer). Prediction errors (SECV as a percentage of mean values) were 5.5, 6.5 and 2.5 for Dry, Wet1 and Wet2 respectively for intake by dairy cows (n=28). Corresponding values were 10.3, 16.1 and 10.9 for lambs (n=88). The Wet2 method gave more accurate predictions than Wet1 except for predictions of ADF and unfermentable metabolisable energy …
Monitoring Kinetics Of Readily Available Fermentable Components By Means Of In-Vitro Gas Production, G Pichard, G Jaurena, M A. Bruni
Monitoring Kinetics Of Readily Available Fermentable Components By Means Of In-Vitro Gas Production, G Pichard, G Jaurena, M A. Bruni
IGC Proceedings (1977-2023)
In vitro rumen incubations were used for measuring substrate disappearance and gas production dynamics. Samples were neutral detergent extracts of alfalfa and orchardgrass with or without added glucose. A logistic multi-pool model was used for describing feed fractions with distinct kinetic parameters, namely pools A, B1, B2 and C that represent fractions of increasing refractoriness. This technique based on gas measurement allowed to monitor early fermentation kinetics of readily available substrates thus overcoming the limitations encountered in traditional in vitro substrate disappearance. Pools A, B1 and B2 showed specific rates near 0.14 , 0.08 and 0.02 and lags of zero, …
Analysis Of Mixed Sward Silage By Near Infrared Reflectance Spectroscopy (Nirs), P Castro, J Castro, A Gonzalez-Arraez, G Flores
Analysis Of Mixed Sward Silage By Near Infrared Reflectance Spectroscopy (Nirs), P Castro, J Castro, A Gonzalez-Arraez, G Flores
IGC Proceedings (1977-2023)
NIR calibration equations were developed to determine crude protein (CP), acid detergent fibre (ADF), organic matter (OM), in vivo organic matter digestibility (OMD) and metabolizable energy (ME) in mixed swards silages. Spectra of 96 in vivo evaluated silages were recorded on a PSCO 6250 monochromator spectrophotometer using NSAS (NIRS Spectral Analysis Software) and converted to NewISI software. NIR calibrations were obtained by modified PLS regression of the 2nd. derivative of SNV and De-trended spectra on laboratory and in vivo data. Determination coefficients (R2) ranged from 0.77 for ME to 0.98 for CP and OM. Highest standard errors of calibration and …
Qualitative Parameters Of Two Cultivare Of Panicum Maximum, Jacq. Under Grazing, B Lempp, J.M B. Ezequiel, J.M Dos Dantos, A H. Zimmer, V Favorette, C F. Damiao, F.J W. Cattelan, L.F C. Defigueuredo, A P. Martins Jr
Qualitative Parameters Of Two Cultivare Of Panicum Maximum, Jacq. Under Grazing, B Lempp, J.M B. Ezequiel, J.M Dos Dantos, A H. Zimmer, V Favorette, C F. Damiao, F.J W. Cattelan, L.F C. Defigueuredo, A P. Martins Jr
IGC Proceedings (1977-2023)
Two Panicum maximum cultivars were studied with respect to forage leaf blade availability and extrusa through chemical parameters, tissue proportion and degradation. It was concluded by observing digestive residues that the studies qualitative parameters did not show indication of higher fragility of the cultivar ‘Aruana’ in relation the cultivar ‘Vencedor’.
Herbage Quality At Continuous Grazing With Dairy Cows At Different N-Intakes And Sward Types, K Soegaard, O Aaes
Herbage Quality At Continuous Grazing With Dairy Cows At Different N-Intakes And Sward Types, K Soegaard, O Aaes
IGC Proceedings (1977-2023)
Herbage quality was examined in paddocks continuously grazed by dairy cows fed supplements with low and high N. There were two sward types for each level of supplement, i.e. fertilized perennial ryegrass (Lolium perenne L) and unfertilized perennial ryegrass/white clover (Trifolium repens L) with a mean clover content of 49 % of dry matter. Decreasing N-intake from 307 to 140 g N cow -1 d -1 by feeding low-N supplements had a small influence on herbage quality in spite of the reduced N-output via urine and faeces. Variation in herbage quality was large during the growing season. The fibre concentration …
Characterizing Effective Fiber With Particle Size And Fiber Concentration Interactions, D R. Buckmaster, A J. Heinrichs, R A. Ward, B P. Lammers
Characterizing Effective Fiber With Particle Size And Fiber Concentration Interactions, D R. Buckmaster, A J. Heinrichs, R A. Ward, B P. Lammers
IGC Proceedings (1977-2023)
Both physical form and chemical nature of fiber is important to ruminant animals. A recently developed method for determining particle size distribution was used to characterize typical distributions for forages and total mixed rations (TMR) from the Mid-Atlantic region of the U.S. An effective fiber index (EFI) and modified effective fiber index (MEFI) are proposed which link physical and chemical characteristics. The EFI and MEFI are computed by weighting NDF concentrations by particle size distribution and effectiveness for contribution towards a rumen mat and rumination.
A Model Of Digestibility Dynamics In Leaf Segments In Grass Swards, M Hirata
A Model Of Digestibility Dynamics In Leaf Segments In Grass Swards, M Hirata
IGC Proceedings (1977-2023)
A mechanistic model which describes the dynamics of dry matter digestibility (DMD) in leaves in a grass sward was developed. The model treats the leaves in the sward canopy as a set of 2 cm-long canopy components, and simulates DMD dynamics in the components from their emergence through aging. Each component has its own initial DMD at emergence, and the DMD decreases as the component ages. The model was parameterized and tested against data from a bahiagrass (Paspalum notatum Függe) pasture. This new, mechanistic approach was proved to be useful in developing our mechanistic understanding of DMD dynamics in a …
Quality And Nutritive Value Of Alfalfa And Grass Silages With Biological Additives, H Shorko-Sajko, W Bednarski, J Kowalewska-Piontas, J Sajko, K Mlynarczyk
Quality And Nutritive Value Of Alfalfa And Grass Silages With Biological Additives, H Shorko-Sajko, W Bednarski, J Kowalewska-Piontas, J Sajko, K Mlynarczyk
IGC Proceedings (1977-2023)
The present study satisfactorily utilized some food industry byproducts for improving fermentation characteristics, quality and nutritive value of silages. Five kinds of preparations were made: sugar-enzymes based (beet molasses and brewer’s yeast, mycelium of Aspergillus niger, malted barley at 3:3:3:1); enzymes-bacteria based (mycelium of Aspergillus niger, malted barley, acidic whey, fermentation broth and lactic acid bacteria or skim milk powder at 3:0.9:3:0.1); sugar based (molasses and brewer’s yeast at 1:1) and concentrate of lactic acid bacteria only. Untreated or additive-treated first-cut low sugar (60g kg-1DM, 19.4% DM) alfalfa ( Medicago sativa) plus grasses (Phleum pratense and Dactylis glomerata) was …
A Dynamic Model For Changes In Nutritional Value In Grass. An Approach To Modify The Model To A Mixed Ley With Grass And Red Clover, A.-M Gustavsson
A Dynamic Model For Changes In Nutritional Value In Grass. An Approach To Modify The Model To A Mixed Ley With Grass And Red Clover, A.-M Gustavsson
IGC Proceedings (1977-2023)
The objective of this approach was to check the possibility to modify a dynamic model for simultaneous simulation of the above-ground dry matter growth (DM) and concentrations of crude protein CP) and metabolizable energy (ME) in stands of timothy (Phleum pratense L.) to a model for mixed leys with timothy and red clover (Trifolium pratense L.). DM growth is estimated in relation to intercepted radiation, air temperature, soil-water status and tissue-N concentration. CP is estimated in relation to plant uptake of N from soil mineralization, nitrogen fixation and applied fertilizer, and dilution of N during plant growth. ME …
Effect Of Calcium Nutrition On The Formation Of Calcium Oxalate In Kikuyu Grass, J P. Marais, A D. Barnabas, D L. Figenschou
Effect Of Calcium Nutrition On The Formation Of Calcium Oxalate In Kikuyu Grass, J P. Marais, A D. Barnabas, D L. Figenschou
IGC Proceedings (1977-2023)
The objective of this investigation was to study the formation of calcium oxalate crystals in situ in kikuyu grass (Pennisetum clandestinum) and to determine the effect of calcium uptake on the soluble and insoluble oxalate content of the grass. Oxalate crystals were more abundant in high-calcium leaves than in low-calcium leaves. Electron microscopy showed that the oxalate crystals are formed in association with globular electron-dense bodies in the vacuole of certain cells. The calcium content of kikuyu is increased by increasing the calcium level of the growth medium. However, the increased amount of calcium taken up by the …