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1,921 results for “fertilizers”
Marsh plant species frequency of occurrence along marsh transects for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA.
Marsh plant species frequency of occurrence along marsh transects for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA. The TIDE project aims to simulate eutrophication on a large scale by the addition of NO3- aiming to reach 70µM concentrations from May to September every year during the growing season. This fertilization of the marsh has been going on at Sweeney Creek since the 2004 growing season through 2011 and at Clubhead Creek in 2005 and from 2009 till 2011.
Marsh plant species stem counts for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA.
Marsh plant species stem counts for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA. The TIDE project aims to simulate eutrophication on a large scale by the addition of NO3- aiming to reach 70µM concentrations from May to September every year during the growing season. This fertilization of the marsh has been going on at Sweeney Creek since the 2004 growing season through 2012 and at Clubhead Creek in 2005 and from 2009 till 2012. The reference creeks, West and Nelson, have been sampled in pair with the nutrient enriched creeks.
Creek morphology in Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA.
The length and number of creek fractures in the high marsh turf near the low marsh/high marsh border were measured in Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA. The TIDE project aims to simulate eutrophication on a large scale by the addition of NO3- aiming to reach 70µM concentrations from May to September every year during the growing season. This fertilization of the marsh has been going on at Sweeney Creek since the 2004 growing season through 2012 and at Clubhead Creek in 2005 and from 2009 till 2012
High-marsh invertebrate densities for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA.
Density (individuals per m2) of epibenthic invertebrate (on the surface such as snails and amphipods) for Rowley River tidal creeks associated with long term fertilization experiments, Rowley and Ipswich, MA. The TIDE project aims to simulate eutrophication on a large scale by the addition of NO3- aiming to reach 70μM concentrations from May to September every year during the growing season. Marsh fertilization from 2004 - 2016 at Sweeney Creek and 2005, and 2009-2016 at Clubhead Creek. Nutrient enrichment ended in 2016.
Effect of Long-Term Nitrogen Fertilization on Mycorrhizal Fungi Associated with a Dominant Grass in a Chihuahuan Desert Grassland at the Sevilleta National Wildlife Refuge, New Mexico (2005)
We studied the diversity of arbuscular mycorrhizal fungi (AMF) in a semiarid grassland and the effect of long-term nitrogen (N) fertilization on this fungal community. Root samples of Bouteloua gracilis were collected at the Sevilleta National Wildlife Refuge (New Mexico, USA) from control and N-amended plots that have been fertilized since 1995. Small subunit rDNA was amplified using AMF specific primers NS31 and AM1. The diversity of AMF was low in comparison with other ecosystems, only seven operational taxonomic units (OTU) were found in B. gracilis and all belong to the genus Glomus. The dominant OTU was closely related to the ubiquitous G. intraradices/G. fasciculatum group. N-amended plots showed a reduction in the abundance of the dominant OTU and an increase in AMF diversity. The greater AMF diversity in roots from N-amended plots may have been the result of displacement of the dominant OTU, which facilitated detection of uncommon AMF. The long-term implications of AMF responses to N enrichment for plant carbon allocation and plant community structure remain unclear.
Long-term N-fertilized vegetation plots on Hog Island, Virginia Coastal Barrier Islands, 1992-2014
This dataset contains results from a long-term fertilization study on the dunes of Hog Island, Virginia.
Minirhizotron data from Fertilization Experiment, Hog Island, VA, 1992
Minirhizotron data from fertilization experiment. On 36-year old dune ridge on Hog Island, VA. Data presented are a complete listing of all roots observed during the study period. See Weber, E. 1994. The effect of nitrogen fertilization on the phenology of roots in a barrier island sand dune community. 1994. M.S. Thesis, Old Dominion University for a full description of the data gathering protocol. There were 83 frames (18 mm x 13.5 mm) sampled for every tube. If a frame had no roots in it, then that frame on that date does not appear in this data set.
Long-Term Fertilization Plots in Swale Vegetation on Hog Island, VA 2015 -
Nutrient enrichment plots were installed on Hog Island in 2015 (Moulton, 2017) following a modified Nutrient Network (nutnet.org) protocol. Plots followed a randomized design with three plot treatments (N = nitrogen, P = phosphorus, NP = nitrogen + phosphorus, and C = Control), replicated five times per treatment (N = 20 total experimental units, n = 5 per treatment). Each unit was 3 m2 with 1 m walkways. Units were subdivided into four 1 m2 subplots. N, P, and NP are applied in two applications, 30 days apart, at a rate of 10 g m-2 yr-1. N was added in the form of slow release urea (46-0-0) and P in the form of triple phosphate (0-45-0). Aboveground vegetation was harvested to ground level within a 0.1 x 1 m frame and extrapolated to represent plot level productivity (g m-2). Samples were dried for 72 h at 60 C and weighed (g). Species composition was sampled using areal cover estimation (%) of each species, bare ground, and dead plant material, such that total cover of each plot summed to 100%. Species cover was assessed in 1 m2 sub plots that had not previously been used for destructive sampling.
FIG. 6 in Plate f of the Gundestrup "cauldron": symbols of spring and fertility
FIG. 6. — Bird helmet from Ciumeşti, Romania, second century BC, with zygo- dactylic feet (from Rusu 1971).
FIG. 1 in Plate f of the Gundestrup "cauldron": symbols of spring and fertility
FIG. 1. — The Gundestrup "cauldron", plate f is facing (© National Museum of Denmark, photo Kim Bach).
Collapse and Continuity: A multi-proxy reconstruction of settlement organization and population trajectories in the Northern Fertile Crescent during the 4.2kya Rapid Climate Change event (dataset and R scripts)
<p>The present digital archive is the outcome of the paper: <strong>Lawrence, D., Palmisano, A., and de Gruchy, M.W., 2021. <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0244871">Collapse and Continuity: A multi-proxy reconstruction of settlement organization and population trajectories in the Northern Fertile Crescent during the 4.2kya Rapid Climate Change event</a></strong><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0244871">.</a> <em><strong>PLoS ONE</strong></em><strong>,</strong> <strong><em>16</em></strong>(1).</p> <p>The dataset included here provides a collection of <strong>920 </strong>radiocarbon dates and <strong>1070</strong> sites from archaeological surveys. In addition, the digital archive related to this paper provides reproducible analyses in the form of three scripts written in R statistical computing language.</p>
Assessing Nitrogen Availability in Biobased Fertilizers: Effect of Vegetation on Mineralization Patterns
<p>Biobased nitrogen (N) fertilizers derived from animal manure can substitute synthetic mineral N fertilizer and contribute to more sustainable agriculture. Practitioners need to obtain a reliable estimation of the biobased fertilizers’ N value. This study compared the estimates for pig slurry (PS) and liquid fraction of digestate (LFD) using laboratory incubation and plant-growing experiments. A no-N treatment was used as control and calcium ammonium nitrate (CAN) as synthetic mineral fertilizer. After 100 days of incubation, the addition of PS and LFD resulted in a net N mineralization rate of 10.6 ± 0.3% and 20.6 ± 0.4% of the total applied N, respectively. The addition of CAN showed no significant net mineralization or immobilization (net N release 96 ± 6%). In the pot experiment under vegetation, all fertilized treatments caused N immobilization with a negative net N mineralization rate of −51 ± 11%, −9 ± 4%, and −27 ± 10% of the total applied N in CAN, PS, and LFD treatments, respectively. Compared to the pot experiment, the laboratory incubation without vegetation may have overestimated the N value of biobased fertilizers. Vegetation resulted in a lower estimation of available N from fertilizers, probably due to intensified competition with soil microbes or increased N loss via denitrification.</p>
Empowering Coffee Farming Using Counterfactual Recommendation based RNN-IoT Integrated Soil Fertility Control System
Open the record for dataset details and reuse information.
Case Base for Fertilizer Recommender System
<p>Dataset that contains recommendations for NPK fertilizer rates for different cases of climatic and soil conditions in coffee crops in the Cauca region in Colombia.</p> <p>The variables of this dataset are described below:</p> <p>Density: Represents the planting density of plants in a coffee crop, that is, the number of plants per hectare.</p> <p>Shadow coverage: Indicates the shade per hectare of the coffee crop, measured on a scale from 0 to 1.</p> <p>Season: Refers to the climatic season to which the year in which fertilization is to be carried out was classified. 'Seca' represents the dry season, 'Lluviosa' represents the rainy season and 'Normal' represents the normal season.</p> <p>Humidity: Represents the percentage of moisture in the soil, measured on scales from 0 to 1.</p> <p>N: It is the level of N in the soil, measured in mg/Kg.</p> <p>P: It is the level of P in the soil, measured in mg/Kg.</p> <p>K: It is the level of K in the soil, measured in mg/Kg.</p> <p>pH: It is the pH level in the soil.</p> <p>Cond_N: It is the rate of nitrogenous fertilizer to recommend.</p> <p>Cond_P: It is the rate of phosphorus fertilizer to recommend.</p> <p>Cond_K: It is the rate of potassium fertilizer to recommend.</p> <p>Note: Fertilizer rates are represented as follows: 1 is low rate, 2 is normal rate, 3 is high rate and 4 is very high rate. The fertilizer rate depends on the sowing density, this is indicated in the corresponding research article.</p> <p>Plus_A and Plus_B are additional recommendations, regarding irrigation and soil and crop care.</p>
Support for Baker's law: facultative self-fertilization ability decreases pollen limitation in experimental colonization
<p><strong>Support for Baker’s law: facultative self-fertilization ability decreases pollen limitation in experimental colonization (datasets for paper in the American Journal of Botany)<br></strong></p> <p>There are 2 files associated with this manuscript. The “PLseedsetindividual.csv” file contains seed set for the pollen limitation treatments for each plant in the experimental populations. Pollinator observation data is available in the “pollinator.csv” file</p> <p><br><strong>Description of the data and file structure:</strong></p> <p><strong>PLseedsetindividual.csv</strong></p> <ul> <li>source.population = one of the four source populations used to create our experimental populations</li> <li>autonomy= autonomous selfing category, high or low</li> <li>individual = plant id</li> <li>experimental.population = the id of the experimental population </li> <li>site = site ID</li> <li>size = size of experimental population, single or small</li> <li>date initiated = date experimental population was put in the field</li> <li>dayfromstartofexperiment = derived from date, the time from the start of the experiment that the experimental population was initiated</li> <li>treatment = the pollination treatment for that flower, control or supplemented</li> <li>seed number = seed set for the treated flower</li> </ul> <p><br><strong>Pollinator.csv</strong></p> <ul> <li>experimental.population = the id of the experimental population </li> <li>site = site ID</li> <li>start.date = day experimental population was initiated</li> <li>end.date = day the experimental popuation was taken out of the field</li> <li>source population = one of the four source populations used to create our experimental populations</li> <li>autonomy= autonomous selfing category, high or low</li> <li>size = size of experimental population, single or small</li> <li>number of plants = number of plants in the experimental population </li> <li>flowers day x (1–4) = number of flowers on day 1</li> <li>males day x (1-4) = number of flowers on day X</li> <li>day.<em>x</em>.poll.date = date of day 1 or day 2 pollinator observation </li> <li>day.<em>x</em>.poll.time = time of day 1 or day 2 pollinator observation </li> <li>bb.day.<em>x</em>, mb.day.x,, sb.day.x., = bumblebee, medium bee, small bee visits on day 1 or day 2</li> <li>total.poll.visits = The total number of pollinator visits across day 1 and day 2</li> <li>visits.per.flower = the number of flowers was averaged across day 1 and day 2. The total number of visits were then divided by the average flower number.</li> </ul>
Data from: Can Sphagnum removal reverse undesired succession of rich fens under different alkalinity and fertility levels?
<p>Dataset, PCA results and species responses to both experiments as an addition to paper with the title "Can <em>Sphagnum</em> removal reverse undesired succession of rich fens under different alkalinity and fertility levels?"</p>
Female reproductive fluid increases the opportunities for post-mating sexual selection by prolonging egg fertilization window
<p>Female reproductive fluid, the fluid that surrounds the eggs, has attracted increasing attention for its role in fertilization and post-mating sexual selection through its effects on sperm traits. Surprisingly, however, only a few studies have investigated the effects of female reproductive fluid on the eggs. Yet, these effects might offer great potential to affect fertilization dynamics by, for example, increasing the opportunities for post-mating sexual selection. Here, we determined whether, by extending the egg fertilization window (time available for egg fertilization), the female reproductive fluid could also increase the opportunities for multiple paternity. Using the Zebrafish Danio rerio we first tested the prediction that female reproductive fluid increases the egg fertilization window, and then, using a split-brood design with sperm of two males added at different times after eggs activation, we tested whether the degree of multiple paternity varies in presence or absence of female reproductive fluid. Our results reveal the potential of the female reproductive fluid to increase multiple paternity throughout its effects on the egg fertilization window thus broadening our knowledge of the mechanisms females in externally fertilizing species affect post-mating sexual selection.</p>
Plant management but not fertilization mediates soil carbon emission and microbial community composition in subtropical Eucalyptus plantations
<p><span>The diversity of </span><span>plant functional group</span><span>s</span><span> in plantations affects soil carbon, but we have limited understanding of the underlying mechanisms for how plant management affects soil carbon dynamics. Here, we conducted a 3-year manipulation experiment of plant functional groups that included understory removal, tree root trenching, and fertilization treatments in 2-year-old and 6-year-old <em>Eucalyptus</em> plantations in the subtropical region. The results showed that soil respiration was significantly suppressed by understory removal (-38%), tree root trenching (-41%), and their interactions (-54%), but that fertilization alone and in interactions had no significant effect. The Chao1 indices for soil bacterial and fungal diversity significantly decreased with understory removal in the 2-year-old plantation and with tree root trenching in the 6-year-old plantation. Soil bacterial and fungal communities were also affected by understory removal and tree root trenching. Soil respiration, physicochemical characteristics, microbial diversity, and community composition were significantly affected by plantation age. Reductions in soil carbon emissions were associated with reductions in plant functional groups and soil microbial groups, while increases in soil respiration were associated with soil physicochemical factors, soil temperature, and plantation age. Our findings highlight that plant managements are of great significance to the soil carbon emission processes in afforested plantations.</span></p>
Dataset: Development and optimization of a bioelectrochemical system for ammonium recovery from wastewater as fertilizer
<p>Dataset of Development and optimization of a bioelectrochemical system for ammonium recovery from wastewater as fertilizer</p> <p><a href="https://doi.org/10.1016/j.clet.2021.100142">https://doi.org/10.1016/j.clet.2021.100142</a></p> <p><a href="https://www.sciencedirect.com/journal/cleaner-engineering-and-technology">Cleaner Engineering and Technology</a> <a href="https://www.sciencedirect.com/journal/cleaner-engineering-and-technology/vol/4/suppl/C">Volume 4</a>, October 2021, 100142</p>
Data for Daudin, Frank & Rapoport « Can internal migration foster the convergence in regional fertility rates? Evidence from 19th century France », Economic Journal (2019), n°620, May, p.1618-1692.
<p>Data for Guillaume Daudin, Raphaël Franck and Hillel Rapoport « Can internal migration foster the convergence in regional fertility rates? Evidence from 19th century France » avec Raphaël Franck et Hillel Rapoport, Economic Journal (2019), n°620, May, p.1618-1692.</p> <p>Downloading the data will provide you with a .zip file.</p> <p>To understand what is going on, please refer to the paper, its git depository and especially this file : https://github.com/gdaudin/migrations/blob/master/R%C3%A9capitulatif%20des%20do%20-%20Migration.pdf</p> <p>All the migration "matrices" are in Stata format (.dta). They are presented as a list of directed pairs of departments (x gender (variable sexe) and x year (variable annee)).</p> <p>"Matrice_complete_1901+1911.dta" are the migration matrices in the source.<br>"Matrices_TRA_Recens.dta" are the main estimated migration matrices.</p>
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