Changes In Soil Fertility And Plant Nutrient Contents In Degraded Tropical Pasture After Renovation,
2024
EMBRAPA-CNPGC
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,
2024
Agricultural Research Center, Egypt
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,
2024
University of Sao Paulo, Brazil
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,
2024
Madurai Kamaraj University
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,
2024
University of Florida
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,
2024
The University of Newcastle
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,
2024
Centre for Agricultural Landscape and Land Use Research
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,
2024
FUSAGRI
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.,
2024
FUSAGRI
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,
2024
Lincoln University
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,
2024
KwaZulu-Natal Department of Agriculture
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,
2024
Institute of Grassland and Environmental Research, North Wyke
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 …
Liming Of Acid Soils. I. Influence On Wheat Yield And Availability Of Soil Nutrients,
2024
Institute of Soil Classification and Mapping
Liming Of Acid Soils. I. Influence On Wheat Yield And Availability Of Soil Nutrients, C D. Tsadilas, V Samaras, J Varvarousis, N Maslaris
IGC Proceedings (1977-2023)
With a two year field experiment the influence of liming of strongly acid soils on wheat yield and on the availability of soil nutrients were studied. The results showed that liming increased soil pH and decreased exchangeable Al and available Fe and Zn. Wheat uptake of Mn was decreased, while P and Cu uptake were increased. Wheat biomass (hay plus seed) production and grain yield were also significantly increased.
Nitrogen Fertilization In Winter Forage Crops In The Southeast Of Buenos Aires Province (Argentina),
2024
Unidad Integrada EEA Balcarce
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 …
Yield And Quality Of Sugarcane As Affected By Phosphate Applied Cation On Soils Of Various Phosphorus Levels,
2024
University of Ryukus
Yield And Quality Of Sugarcane As Affected By Phosphate Applied Cation On Soils Of Various Phosphorus Levels, M A. Matin, K Oya, T Shinjo, T Horiguchi
IGC Proceedings (1977-2023)
Effects of phosphate application on the growth, yield and quality of sugarcane (Saccharum officinarum L.) were studied on the soils having various phosphorus levels. Superphosphate was applied to bring the available soil P at 5, 15, 25 and 35 mg P2O5 100 g-1 designated as A, B, C and D levels, respectively. Leaf area index (LAI) and dry matter increased on the higher P plots over the lower P plots. The highest cane yield (74 t ha-1) and sugar yield (10.2 t ha- 1) were obtained from the B plot and the lowest cane yield (51 t ha-1) and sugar …
Lucerne Decline: The Role Of Acidification,
2024
The University of Adelaide
Lucerne Decline: The Role Of Acidification, D J. Koopman, P G. Tow, T G. Reeves
IGC Proceedings (1977-2023)
Paddock surveys and preliminary glasshouse experiments have identified acidification of the surface soil layers as a contributing factor to the problem of declining lucerne yields occurring in the mid north region of South Australia. In a field experiment, lime application at rates of 2 t/ha and 4 t/ha significantly improved the growth of lucerne in a soil with an acidic topsoil and alkaline subsoil. Lime incorporated into the soil had an initial short term advantage of improving lucerne production over lime applied to the soil surface. By the end of the first season there was no benefit of incorporated lime …
Evaluation Of Different Bradyrhizobium Sp Strains On Nitrogen Fixation Capacity In Four Forage Legumes,
2024
Universidad de La Frontera
Evaluation Of Different Bradyrhizobium Sp Strains On Nitrogen Fixation Capacity In Four Forage Legumes, F O. Gallardo, E S. Lopes, M C. Diez
IGC Proceedings (1977-2023)
Eleven available strains of Bradyrhizobium sp were used to test four forage legumes, Crotalaria juncea (Crotalaria), Cajanus cajans (Guandu), Styzolobium deeriagianum (Mucuna-Ana) and Cyamopsis tetragonoloba (Guar) for symbiotic N-fixation ability. Greenhouse experiments were conducted for nine weeks in order to evaluate shoot, root, and nodule dry weight, nodule number, and shoot nitrogen content. Four strains presented relative nitrogen efficiency (RNE) over 100% with Crotalaria cultivar, whereas only one strain was more efficient with Guandu and Mucuna cultivars. Strain 633 was the only one which presented a high yield with Crotalaria, Guandu and Mucuna-Ana cultivars.
Use Of Reactive Phosphate Rock For Pastures On The Southern Tablelands Of Nsw, Australia,
2024
NSW Agriculture
Use Of Reactive Phosphate Rock For Pastures On The Southern Tablelands Of Nsw, Australia, D L. Garden, P R. Dann, I J. Mcgowen, C O'Malley
IGC Proceedings (1977-2023)
A comparison was made of pasture production from phosphate fertilisers, including superphosphate, reactive phosphate rocks (RPRs) and a non-reactive phosphate rock at two sites on the Southern tablelands of NSW, Australia. Production from all phosphate rocks was low in the first year at both sites, but RPRs were similar to superphosphate by the fourth year. Production from RPRs was low in a dry year which is consistent with the requirement for moist acid soils for effective release of P from RPRs. Performance of RPRs was better at the site which was moister and had higher summer rainfall.
Increased Phosphorus Supply Enhances Water Uptake And Water Use Efficiency In White Clover Under Dry Conditions,
2024
La Trobe University
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,
2024
Río Grande-Dir. Recursos Naturales
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. …
