scholarly journals Evaluación De Métodos Indirectos Para Estimar Biomasa En Un Pastizal Natural Del Sur De Córdoba (Argentina Central)

2017 ◽  
Vol 13 (36) ◽  
pp. 59
Author(s):  
Mónaco N. ◽  
V. Santa ◽  
M.J. Rosa ◽  
V. Autran
Keyword(s):  
Final Section ◽  
Grassland Management ◽  
Present Species ◽  
Average Height ◽  
Use Of Resources ◽  
Natural Reserve ◽  
Index Assignment ◽  
Area Of Influence ◽  
Natural Grassland ◽  
Linear Regressions

To optimize grassland management, it is important to evaluate seasonal changes in quality and production according to the characteristics of the environment, allowing planning and rational use of resources. With the objective of finding estimators that fit the actual production of aerial biomass in natural pastures, it was proposed to estimate biomass with the average height of the pasture and by double sampling, by determination by direct weight estimation and by estimation with index assignment. For this purpose, a natural grassland located in the area of influence of the final section of the Chucul River Basin (La Felipa Natural Reserve) was surveyed. Periodically from April 2013 to March 2016, in ten samples taken with 0.25 m2 quadrants, the biomass was cut and weighed, and the height of the present species was measured. In the area surrounding each quadrant, 50 uncorrected visual observations were made by assigning indexes from 1 to 5 and values of estimated weight according to the amount of forage available. Then a correlation analysis was performed and linear regressions were determined between the parameters studied. Real biomass (BR) showed a significant correlation with biomass estimated by Weight (BEP) and biomass estimated by Index (BEI) (p≤0.05).

scholarly journals Traditional semi-natural grassland management with heterogeneous mowing times enhances flower resources for pollinators in agricultural landscapes

2019 ◽  
Vol 18 ◽  
pp. e00619 ◽  
Author(s):  
Line Johansen ◽  
Anna Westin ◽  
Sølvi Wehn ◽  
Anamaria Iuga ◽  
Cosmin Marius Ivascu ◽  
...  
Keyword(s):  
Grassland Management ◽  
Agricultural Landscapes ◽  
Flower Resources ◽  
Natural Grassland

scholarly journals Forage production in a natural grassland with limestone and phosphorus dosages

2016 ◽  
Vol 37 (5) ◽  
pp. 3265 ◽  
Author(s):  
Nelson Eduardo Prestes ◽  
Cassandro Vidal Talamini do Amarante ◽  
Cassiano Eduardo Pinto ◽  
Gabriel Prestes ◽  
Guilherme Doneda Zanini ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Base Saturation ◽  
Recommended Dose ◽  
Aluminum Concentration ◽  
Average Height ◽  
Forage Production ◽  
Constant Weight ◽  
The Third ◽  
Exchangeable Aluminum ◽  
Natural Grassland

The objective of this study was to assess forage production in a natural grassland by applying different doses of limestone and phosphorus, and the influence of these applications on soil profile. The treatments consisted of the application of limestone doses of 0.0, 7.2, and 14.4 t ha-1 and phosphorus doses of 0,35, 70, and 140 kg of P2O5 ha-1 on the soil surface. The experiment was conducted in a randomized complete block design with split-plots and three replications. The limestone doses were distributed in the main plot and applied only at the beginning of the experiment, whereas the phosphorus doses were distributed in the subplots with subsequent annual maintenance applications. Was used a ruler (cm) for monitoring the growth of pastures and, when grasses reached an average height of 20 cm, forage samples were collected in each subplot and botanical and morphological components were separated and dried until a constant weight was achieved. In the third and fourth assessment years, soil samples were collected in the 0-5, 5-10, 10-15, and 15-20-cm layers to evaluate the influence of treatments on the chemical properties of the soil. The variables analyzed were related to the production of several components, including fodder, native grasses, leguminous plants, unwanted plants, and dead material, in addition to soil properties such as pH, exchangeable aluminum concentration, and base saturation. There was no interaction between the limestone and phosphorus treatments. The effect of limestone doses on forage production was assessed in the third year, and, in the following year, the intermediate dose of limestone (7.2 t ha-1) produced the highest yield (2,316.1 kg of dry matter [DM] of forage ha-1). The increase in phosphorus doses increased forage production in the second year, and reached yields of up to 2,232 Kg DM ha-1 in the fourth year. In summary, the production of natural pastures was enhanced by the application of 25% of the recommended dose of limestone (7.2 t ha-1), and by the application of 50% of the recommended dose of phosphorus (70 kg P2O5 ha-1). The increase in limestone doses directly affected the chemical properties of the soil by decreasing acidity and exchangeable aluminum, and increasing base saturation, even in deeper layers (0-20 cm). The increase in phosphorus doses did not increase the mobility of this nutrient in the deeper layers of the soil (10-20 cm), and the effects were restricted to a depth of up to 10 cm.

Analysis of species-rich flowery grassland associations according to their ecological needs

2012 ◽  
Vol 60 (4) ◽  
pp. 407-416
Author(s):  
M. Harcsa ◽  
L. Szemán
Keyword(s):  
Soil Analysis ◽  
Grassland Management ◽  
Nutrient Supply ◽  
Grass Species ◽  
Main Question ◽  
Plant Association ◽  
High Species Diversity ◽  
Similar Temperature ◽  
Natural Grassland ◽  
Temperature Water

Botanical changes were examined on a ten-year-old semi-natural grassland established using mixtures with high species diversity. The mixtures contained seventeen wild flowers of natural origin together with two leguminous and seven grass species or varieties. Three different mixtures were arranged in three replications. The grassland management system was non-intensive (without nutrient supply or irrigation). A survey involving cover assessment revealed nine residual species from among the twenty-six originally sown. The main question addressed in the study was whether there was any connection between the ecological properties of the habitat and the ecological needs of the residual species and it was concluded that all the residual species had similar temperature, water balance and soil requirements. It could be seen that the present plant association gave a good reflection of the results of soil analysis. This suggests that soil analysis should be carried out before sowing new species-rich grasslands in order to compile a mixture suited to the nature of the habitat.

Biomass of Phragmites australis and Effect Factors Analyzing in Zha Long Wetland

2011 ◽  
Vol 393-395 ◽  
pp. 1119-1123
Author(s):  
Tao Zeng ◽  
Hui Huang
Keyword(s):  
Phragmites Australis ◽  
Nitrogen Concentration ◽  
Weight Ratio ◽  
Average Diameter ◽  
Phosphorus Concentration ◽  
Limiting Factor ◽  
Average Height ◽  
Nitrogen And Phosphorus ◽  
Natural Reserve ◽  
Average Biomass

Phragmites australis are the typical vegetation in Zha Long National Natural Reserve. From August 10th to August 21st in 2006, we chose 60 quadrats in 15 sample sites, investigated the reed biomass, height, diameter, water nitrogen and phosphorus concentration. The results are as follow: 1) the average biomass of Phragmites australis models is 2858g•m-2 and the biomass between 15 sample sites is from 2029.0 to 4067.4 g•m-2; 2) the moisture content of Phragmites australis is from 42.95% to 64.95%. The average height of Phragmites australis is 272.47cm, and the average diameter of Phragmites australis is 0.51cm; 3) the NP weight ratio in each sample site concentrate from 9.18 to 15.79. Nitrogen is the most important limiting factor in Phragmites australis vegetation growing while phosphorus is not the limiting factor; 4) the Phragmites australis biomass is restricted by many factors especially water depth and water nitrogen concentration. But the phosphorus concentration in water has irrelativeness with Phragmites australis biomass.

scholarly journals Beef heifers performance in natural grassland under continuous and rotational grazing in the autumn-winter

2015 ◽  
Vol 45 (10) ◽  
pp. 1859-1864 ◽  
Author(s):  
Émerson Mendes Soares ◽  
Fernando Luiz Ferreira de Quadros ◽  
Régis Maximiliano Roos de Carvalho ◽  
Leandro Bittencourt de Oliveira ◽  
Felipe Jochims ◽  
...  
Keyword(s):  
Reproductive Tract ◽  
Body Condition Score ◽  
Average Daily Gain ◽  
Experimental Period ◽  
Grassland Management ◽  
Neutral Detergent Fiber ◽  
Winter Period ◽  
Beef Heifers ◽  
Rotational Grazing ◽  
Natural Grassland

The aim of this study was to evaluate the performance of beef heifers in natural grassland under continuous and rotational grazing during the autumn-winter period. The treatments were distributed in a completely randomized design and conducted using the forage mass above eight cm and 50% of the leaf blades mass of tussocks. The animals were Brangus beef heifers with initial body weight of 258kg. The variables evaluated were available forage mass (FMa), leaf blades mass of tussocks (LBMt), real forage allowance (FAr), sward height of the lower stratum (HLS), crude protein (CP), neutral detergent fiber (NDF), organic matter digestibility (OMD), total digestible nutrients (TDN), average daily gain (ADG), body condition score (BCS), reproductive tract score (RTS) and stocking rate (SR). FMa, HLS, OMD and TDN decreased while FAr, CP and NDF were similar during the experimental period. The ADG was positive only at third experimental period while BCS, RTS and SR decreased over time. The natural grassland management under continuous and rotational grazing during the autumn-winter period, using the forage mass above 8cm and 50% of the leaf blades mass of tussocks, does not allow the adequate corporal development for breeding the beef heifers at 24 months old.

The Biomass of Phragmites australis and Influencing Factors Analysis in Zha Long Wetland

2011 ◽  
Vol 183-185 ◽  
pp. 844-848
Author(s):  
Zhan Shu ◽  
Xue Ying Di ◽  
Hui Huang
Keyword(s):  
Phragmites Australis ◽  
Nitrogen Concentration ◽  
Weight Ratio ◽  
Average Diameter ◽  
Phosphorus Concentration ◽  
Limiting Factor ◽  
Average Height ◽  
Nitrogen And Phosphorus ◽  
Natural Reserve ◽  
Average Biomass

Phragmites australis are the typical vegetation in Zha Long National Natural Reserve. From August 10 to August 21st in 2006, we chose 60 quadrats in 15 sample sites, investigated the reed biomass, height, diameter, water nitrogen and phosphorus concentration. The results are as follow: 1) the average biomass of Phragmites australis models is 2858g•m-2 and the biomass between 15 sample sites is from 2029.0 to 4067.4 g•m-2; 2) the moisture content of Phragmites australis is from 42.95% to 64.95%. The average height of Phragmites australis is 272.47cm, and the average diameter of Phragmites australis is 0.51cm; 3) the NP weight ratio in each sample site concentrate from 9.18 to 15.79. Nitrogen is the most important limiting factor in Phragmites australis vegetation growing while phosphorus is not the limiting factor; 4) the Phragmites australis biomass is restricted by many factors especially water depth and water nitrogen concentration. But the phosphorus concentration in water has irrelativeness with Phragmites australis biomass.

scholarly journals Traditional semi-natural grassland management with heterogeneous mowing times enhances flower resources for pollinators in farmed landscapes.

2018 ◽  
Author(s):  
Line Johansen ◽  
Tommy Lennartsson ◽  
Anna Westin ◽  
Anamaria Iuga ◽  
Cosmin Marius Ivascu ◽  
...  
Keyword(s):  
Grassland Management ◽  
Flower Resources ◽  
Natural Grassland

MARS — Its Tenth Anniversary of Operation and its Future

1980 ◽  
Vol 19 (03) ◽  
pp. 125-132
Author(s):  
G. S. Lodwick ◽  
C. R. Wickizer ◽  
E. Dickhaus
Keyword(s):  
Conceptual Development ◽  
Administrative Support ◽  
Final Section ◽  
Economic Benefits ◽  
Hospital Environment ◽  
Computer Scientist ◽  
University Of Missouri ◽  
Complete Bibliography ◽  
The University ◽  
Economic Considerations

The Missouri Automated Radiology System recently passed its tenth year of clinical operation at the University of Missouri. This article presents the views of a radiologist who has been instrumental in the conceptual development and administrative support of MARS for most of this period, an economist who evaluated MARS from 1972 to 1974 as part of her doctoral dissertation, and a computer scientist who has worked for two years in the development of a Standard MUMPS version of MARS. The first section provides a historical perspective. The second deals with economic considerations of the present MARS system, and suggests those improvements which offer the greatest economic benefits. The final section discusses the new approaches employed in the latest version of MARS, as well as areas for further application in the overall radiology and hospital environment. A complete bibliography on MARS is provided for further reading.

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