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Articles 3301 - 3330 of 9540
Full-Text Articles in Agricultural Science
Verification Of And Genetic Variation Between Stylosanthes Sp. Aff. S. Scabra Accessions, C J. Liu
Verification Of And Genetic Variation Between Stylosanthes Sp. Aff. S. Scabra Accessions, C J. Liu
IGC Proceedings (1977-2023)
Thirty-three Stylosanthes accessions, which are all considered to be S. sp. aff. S. scabra, were analysed using STS and RAPD as genetic markers. These accessions were readily clustered into two major groups based on dissimilarity values, with 28 accessions in one group (A) and the other five in the other (B). STS analysis indicated that accessions in group A are diploid S. sp. aff. S. scabra but those in B are tetraploids, likely to be S. scabra or its closely related taxa. Cytological examination of root-tip cells confirmed that the five accessions in group B are all tetraploids. Genetic dissimilarity …
Assessing The Impact Of Dietary Addition Of Lignin On Growth Performance, Nitrogen Balance And Faecal Microorganisms In Grain-Fed Veal Calves, L E. Phillip, E S. Idziak
Assessing The Impact Of Dietary Addition Of Lignin On Growth Performance, Nitrogen Balance And Faecal Microorganisms In Grain-Fed Veal Calves, L E. Phillip, E S. Idziak
IGC Proceedings (1977-2023)
A study was conducted with ALCELLR - lignin (A-lignin) to evaluate its impact on performance of grain- fed veal calves. Thirty two male calves (avg. initial wt, 190 kg) were fed for 13 weeks grain corn and a protein supplement with added A-lignin to supply 0, 1.25%, 2.5% or 5.0% of diet. Eight other calves were used to study nitrogen balance, and grab samples of faeces were analyzed for anaerobic, aerobic and coliform bacteria. A-lignin at 1.25% of diet increased (p<.01) weight gain by 12%. Addition of A-lignin also decreased (p< 0.01) organic matter digestion, increased (p<.01) faecal N excretion but did not significantly alter N balance. A-lignin reduced (p< 0.01) faecal ammonia concentration but increased (p <.01) DM content of grab samples of faeces; there were no significant effects on populations of faecal microorganisms. The study revealed a beneficial effect of A-lignin on calf growth but the reason for the response was not uncovered.
Qualitative Evaluation Of D.H.P. (Dihidroxipiridine) In The Urine Of Buffaloes Fed With Leucaena, P B. Alcantara, T A. Ferreira, D A. Beisman, A.M F. Pereira
Qualitative Evaluation Of D.H.P. (Dihidroxipiridine) In The Urine Of Buffaloes Fed With Leucaena, P B. Alcantara, T A. Ferreira, D A. Beisman, A.M F. Pereira
IGC Proceedings (1977-2023)
The aim of this study was to evaluate the DHP elimination in the urine of buffaloes fed with three levels of leucaena (0,10 and 20g of leucaena's DM/kg LW0.75), plus corn silage at 2.5% of LW in D.M. The main purpose was to estimate the levels of mimosine toxicity in those resistant animals. Data showed that DHP started to be eliminated at the first urination in both levels of leucaena. This occurred one hour after ingestion. DHP was present up to the third urination (5 hours after ingestion) in the highest level.
Genomic Cloning Of Fasciola Hepatica Excretory-Secretory Antigenic Genes In E. Coli, Xu Heng, Zheng Li, Liu Shigui, Shen Bin, Wu Fend
Genomic Cloning Of Fasciola Hepatica Excretory-Secretory Antigenic Genes In E. Coli, Xu Heng, Zheng Li, Liu Shigui, Shen Bin, Wu Fend
IGC Proceedings (1977-2023)
A complementary DNA (cDNA) library was constructed from the mRNA of adult worms of Fasciola hepatica in the expression vector gt11, the size of the library contained approximately 2.4 x 105 recombinants and the recombinant efficiency was 85%. The library was directedly screened with a rabbit antisera raised against a excretory-secretory (ES) antigen of Fasciola hepatica. Two positive clones of strong signal were selected from a group of 200 positive clones, named FH3 and FH7. The length of external fragments of two recombinants were 0.85Kb (FH3) and 1.15Kb (FH7). The E.coli 1089 host was infected by recombinants FH3 and FH7 …
Effect Of Plant Species On The Development And Vertical Migration Of Larvae Of Gastrointestinal Nematodes Which Parasitise Sheep, J H. Niezen, W.A. G. Charleston, J Hodgson, C M. Miller, H A. Robertson
Effect Of Plant Species On The Development And Vertical Migration Of Larvae Of Gastrointestinal Nematodes Which Parasitise Sheep, J H. Niezen, W.A. G. Charleston, J Hodgson, C M. Miller, H A. Robertson
IGC Proceedings (1977-2023)
The development and migration of gastrointestinal nematode larvae on a range of herbage species were compared following a series of standardised contaminations with sheep faeces over two years. In 1992/93, greatest numbers of larvae were recovered from browntop (Agrostis capillaris cv Grasslands Muster), cocksfoot (Dactylis glomerata cv Grasslands Kara), ryegrass (Lolium perenne cv Grasslands Nui) and Yorkshire fog (Holcus lanatus cv Massey Basyn) while the lowest numbers were recovered from white clover (Trifolium repens cv Grasslands Huia) with the other herbages intermediate. In 1993/94, highest numbers were recovered from Yorkshire fog and ryegrass, lowest numbers from …
Seed Proteinase Inhibitors From Annual Medics Active Against Insect Pests, M Odoardi, A Tava, F Ceciliani
Seed Proteinase Inhibitors From Annual Medics Active Against Insect Pests, M Odoardi, A Tava, F Ceciliani
IGC Proceedings (1977-2023)
Several different species of annual medics have been tested for the occurrence and concentration of trypsin inhibitors in the seed. Trypsin Inhibitory Activity (TIA) has been in fact related to the level of resistance to biotic and abiotic stresses. Wide variation was found for TIA among species, with the highest values shown by the snail medic (Medicago scutellata). After a simple and rapid procedure of chromatographic purification, the Trypsin Inhibitor (TI) from snail medic has been tested towards the trypsin-like proteinases extracted from larvae of different phytophagous insects, showing high levels of Inhibitory Activity. The complete amino acid …
The Effect On Intake Palatability And Digestibility Of Phenolic Compounds In Tagasaste (Chamaecytisus Proliferus), N J. Edwards, J C. Mailey, D M. Mcneill, J B. Lowry, C S. Mcsweeney, D A. Henry, C M. Oldham
The Effect On Intake Palatability And Digestibility Of Phenolic Compounds In Tagasaste (Chamaecytisus Proliferus), N J. Edwards, J C. Mailey, D M. Mcneill, J B. Lowry, C S. Mcsweeney, D A. Henry, C M. Oldham
IGC Proceedings (1977-2023)
The major secondary metabolites currently identified in tagasaste (Chamaecytisus proliferus) belong to the phenolic group of compounds. The principal phenolic compounds are the flavones, apigenin and luteolin, but low concentrations of condensed tannins, the isoflavonoid daidzein and the alkaloid sparteine have also been detected in some samples. No flavonols have been detected. There is a strong relationship between the concentration of phenolic compounds in tagasaste and its palatability. Furthermore, digestibility of tagasaste is relatively high throughout the year, thereby implicating intake as the major factor influencing the seasonality of liveweight performance of livestock grazing tagasaste. Despite confirmation of …
Effect Of Endophyte-Infected Tall Fescue Hay On Dairy Heifers Under European Intensive Management, J C. Emile, J P. Ravault, J M. Chabosseau
Effect Of Endophyte-Infected Tall Fescue Hay On Dairy Heifers Under European Intensive Management, J C. Emile, J P. Ravault, J M. Chabosseau
IGC Proceedings (1977-2023)
Two fields were established at Lusignan (France) with the same variety of tall fescue but differing in the rate of Acremonium coenophialum seed infestation : 0 % = E- ; 100 % = E+. Dairy heifers were fed ad libitum with E- or E+ hay and were given in addition 1.7 kg DM of concentrates. No effect was noticed on the intake (5.65 vs 5.63 kg DM) as well as on ADG (874 vs 838 g/d) regarding E- vs E+ hay resp. However, prolactin concentration was significantly halved when heifers were fed with the E+ hay. More temperate climatic conditions …
Feeding Strategies To Optimize Reproductive Performance Of Cattle Grazing High Protein Pastures In Uruguay, H R. Tosi, K M. Wittenberg
Feeding Strategies To Optimize Reproductive Performance Of Cattle Grazing High Protein Pastures In Uruguay, H R. Tosi, K M. Wittenberg
IGC Proceedings (1977-2023)
Alternative feeding strategies were investigated for Holstein heifers grazing a vegetative red, Trifolium pratense L., and white clover, Trifolium repens L., pasture. A total of 474 grazing heifers were supplemented varying amounts of corn silage, Zea mays, during the breeding season in an effort to improve reproductive performance. Animal response to supplementation, whether on spring or winter pasture, was similar. Corn silage supplemented at 18.8 or 28.8% DM basis of total diet, for winter and spring pastures, respectively, resulted in animal weight gains similar to that of heifers receiving legume pasture only. Serum urea nitrogen and reproductive performance for heifers …
Strategies For Improving Efficiency Of Beef Cattle In Tall Fescue Pasture Systems, J C. Waller, H A. Fribourg
Strategies For Improving Efficiency Of Beef Cattle In Tall Fescue Pasture Systems, J C. Waller, H A. Fribourg
IGC Proceedings (1977-2023)
A beef (Bos taurusL.) cattle producer must allocate land and forage resources to meet nutrient needs of the entire herd. Using 20 yr of calving and grazing data, templates of herd composition, associated Total Digestible Nutrients (TDN) requirements over the whole year, and forage TDN production were developed for a typical herd and land area. The monthly energy needed by the entire herd was relatively constant. Forage productivity varied monthly, indicating the need to plan for efficiently using surplus TDN from some seasons to meet needs at other times. This approach could be expanded to include more definitive …
Eneficial Use Of Grasses Artificially Infected With Endophytes, Non-Toxic To Animals, G.C M. Latch, L R. Fletcher
Eneficial Use Of Grasses Artificially Infected With Endophytes, Non-Toxic To Animals, G.C M. Latch, L R. Fletcher
IGC Proceedings (1977-2023)
Information presented in this paper demonstrates that Ryegrass Staggers does not occur in animals which graze ryegrasses (Lolium sp.) artificially infected with a strain of Acremonium endophyte which does not produce the tremorgenic toxin lolitrem B. Peramine is produced by the endophyte and this alkaloid protects the grass from attack by Argentine stem weevil. New Zealand farmers have used a ryegrass cultivar infected with this strain of endophyte for the past four years and there are no reports of Ryegrass Staggers in animals grazing it. Strains of endophytes have been found in other grasses which do not produce toxins …
The Effect Of Ryegrass Endophyte On Milk Production From Dairy Cows In Northern New Zealand, E R. Thom, D A. Clark, C D. Waugh, R J. Mccabe, V T. Van Vught, B.J L. Kock
The Effect Of Ryegrass Endophyte On Milk Production From Dairy Cows In Northern New Zealand, E R. Thom, D A. Clark, C D. Waugh, R J. Mccabe, V T. Van Vught, B.J L. Kock
IGC Proceedings (1977-2023)
The aim of this study was to compare the milk production of cows grazing endophyte-infected perennial ryegrass (Lolium perenne L.) pasture with those grazing endophyte-free pastures. High and nil endophyte ryegrass pastures were drilled with and without white clover (Trifolium repens L.) in autumn 1993. White clover was completely removed in autumn 1995. High endophyte pastures had >85% of tillers infected but nil endophyte pastures were rapidly contaminated with endophyte-infected ryegrass and had 50% infection by autumn 1996. Losses in milk production due to endophyte were small (<6%), and occurred in only 2 of the 6 three week test periods. Cows showed clinical symptoms of ryegrass staggers in summer/autumn 1995 but not in 1996. Heat stress symptoms were absent. Losses of milk production occurred when lolitrem B levels were low (spring 1994) and when cows did not show clinical staggers (summer 1996). Other chemicals or agronomic factors could be important determinants of the milk production responses.
Use Of Willows (Salix Spp) As Drought Fodder For Sheep, S K. Oppong, P D. Kemp, G B. Douglas, B T. Bulloch
Use Of Willows (Salix Spp) As Drought Fodder For Sheep, S K. Oppong, P D. Kemp, G B. Douglas, B T. Bulloch
IGC Proceedings (1977-2023)
The effects of cutting height and harvesting times on the forage yield, yield components and quality of Tangoio hybrid willow and Kinuyanagi willow were examined, to evaluate these willows as drought fodder for sheep. Tangoio (3.8 tDM/ha) outyielded Kinuyanagi (3 tDM/ha) in edible forage production and provided reasonable quality fodder (nitrogen content of 2.0 % and digestibility of 65 -69 %). The high edible forage yield of the willows relative to pasture (0.8 tDM/ha) during January and April showed that they provided potentially valuable supplements to pasture production. The willows, especially Tangoio, are recommended for use as maintenance fodder for …
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, …
The Nitrate Accumulation In Sorghum Sudangrass Hybrids Varying With The Level Of Nitrogen Fertilizer, C Yoon
The Nitrate Accumulation In Sorghum Sudangrass Hybrids Varying With The Level Of Nitrogen Fertilizer, C Yoon
IGC Proceedings (1977-2023)
A field experiment with 80, 160 and 240 kg N/ha application levels was carried out to study the nitrate nitrogen accumulation in the sorghum sudangrass hybrids at Iri National College of Agriculture and Technology farm in 1995. The nitrate nitrogen content of Xtragraze II exceeded the safe level of ruminants at the level of 160kg application, and decreased at the low level in the later stage of growth, but that in Civa 1990 was almost kept constant at the same level. Nitrate nitrogen accumulation of Civa 1990 was higher than that of Xtragraze II. A sum exceeding 160kg N does …
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.
Nutrient Budget Of Themedia Triandra And Heteropogon Controtus Dominated Grasslands Of Tamil Nadu In South India, K Paliwal, K Manoharan
Nutrient Budget Of Themedia Triandra And Heteropogon Controtus Dominated Grasslands Of Tamil Nadu In South India, K Paliwal, K Manoharan
IGC Proceedings (1977-2023)
Nutrient availability of a grassland mainly depends on the productivity of grasses. Total 3252.20 g/m2/yr dry matter production was recorded in Themeda grassland. Annual uptake and return of nitrogen (31.10 g/m2) phosphorus (3.08 g/m2) and potassium (29.45 g/m2) through litter and belowground biomass was higher in Themeda. Themeda triandra is better fodder grass than Heteropogon contortus in the Eastern ghats grasslands.
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 …
An Evaluation Of The Effectiveness Of Steelworks Slag As A Fertilizer For Use On Grassland, A Younger
An Evaluation Of The Effectiveness Of Steelworks Slag As A Fertilizer For Use On Grassland, A Younger
IGC Proceedings (1977-2023)
The objective of this work was to evaluate the steelworks by-product, steelworks slag, for use on established grassland. The effects of three rates of slag application were compared against those of lime and phosphate applications calculated to be equivalent to those applied in slag. Experiments were conducted at seven grassland sites, differing in initial pH, in the north east of England, and the treatments were evaluated in terms of their effects on both soil pH and herbage production over a three year period. Slag was effective at increasing soil pH at all sites, producing responses similar to those of limestone. …
Nutrient Uptake And Growth Stimulation Of Grasses And Legumes By Rhizosphere Microorganisms, G Hoflich
Nutrient Uptake And Growth Stimulation Of Grasses And Legumes By Rhizosphere Microorganisms, G Hoflich
IGC Proceedings (1977-2023)
Selected Rhizobium bacteria and mycorrhiza fungi by single and combinated inoculation stimulate the growth and the nutrient uptake (nitrogen, phosphorus, potassium) of alfalfa and alfalfa-grass more than that of red clover and red clover grass. The extra yield was higher on loamy sand than on sandy loam. The proportion of legumes should be 60 to 66 % as a requirement to get positive inoculation effects and an effective N2-fixation in legumegrass- mixtures.
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) …
Effects Of Different Phosphate Fertilizers On Pasture Nutrition And Soil Phosphorus In Canterbury, New Zealand, L M. Condron, K M. Goh
Effects Of Different Phosphate Fertilizers On Pasture Nutrition And Soil Phosphorus In Canterbury, New Zealand, L M. Condron, K M. Goh
IGC Proceedings (1977-2023)
A field trial was conducted over 6 years to assess the relative performance of three phosphate (P) fertilisers of differing solubility (single superphosphate, ‘longlife’ superphosphate, ‘reactive’ phosphate rock) on a permanent pasture at Methven in Canterbury, New Zealand. Plant P uptake data showed that while the overall relative effectiveness of the fertilisers was closely related to their water-soluble P content (single superphosphate > ‘longlife’ superphosphate > ‘reactive’ phosphate rock), the agronomic efficiency of the sparingly soluble phosphate rock fertiliser improved markedly with time. Soil P analysis demonstrated that significant dissolution of phosphate rock had occurred in the soil, and the findings of …
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 …
An Integrated Soil Testing-Modeling Approach To Improve Fertilizer Recommendations For Grassland, L Brown, D Scholefield, E C. Jewkes, N Preedy
An Integrated Soil Testing-Modeling Approach To Improve Fertilizer Recommendations For Grassland, L Brown, D Scholefield, E C. Jewkes, N Preedy
IGC Proceedings (1977-2023)
New management strategies are required in order to reduce the appreciable emissions of N from intensively managed grassland. Previous work has shown that if fertiliser is applied at rates that take account of the mineral N found in soil at the time of each application, N use efficiency can be improved. A novel approach is described which integrates soil testing and modelling to produce N fertiliser recommendations on a monthly basis. An existing annual model of the N cycle in grassland has been modified to produce monthly predictions of mineral N in the soil. The model is being validated by …