Earth Sciences Commons^™

Phosphorus, Sulphur And Micronutrients On Grassland Improvement With White Clover (Trifolium Repens L.) On Basaltic Soils In Uruguay, A. Morón, D. F. Risso

IGC Proceedings (1977-2023)

Grasslands improvement with legumes is a promising technology for increasing forage quality and productivity on basaltic soils, but requires the correction of nutrient deficiencies. Phosphorus is a key element, but usual techniques of soil analysis are not good predictors. An experimental work was conducted in the northern region of the country. Evaluating the response of an improvement with white clover to P. Citric Acid showed a good association between soil P status and legume behavior. In addition there was a positive trend in forage production, in relation to S application, even though this effect was only significant in legume yield …

Multi-Year Application Of Dairy Slurry On Grassland: Effects On Crop, Soil Biota, Soil Nutrients, And N2O Emission, Shabtai Bittman, C. G. Kowalenko, D. E. Hunt, N. Patni, J. Paul, D. Raworth, J. Hountin, T. A. Forge, C. M. Monreal, O. Schmidt

IGC Proceedings (1977-2023)

The long-term effects of using manure as the principal nutrient source in intensive crop production systems are not well known. This paper reports on the effects of multi-year application of fertilizer or dairy slurry on a tall fescue (Festuca arundinacea Schreb.) sward. Slurry sustained greater grass yield than chemical fertilizer. Unlike fertilizer, slurry supplied 70 to 120 kg N/ha one year after application but little after one year; 4-years of manure applications built up the stable organic matter pool in the soil. Manure-N was less prone to leaching but more prone to N₂O emissions than fertilizer-N. Manured …

Influence Of Fertilization On Botanical Composition And Productivity Of Rangeland In A Semi-Arid Climate Of South Africa, Hennie A. Snyman, I. B. Oosthuizen

IGC Proceedings (1977-2023)

The objective of this study was to determine the short-term response of rangeland to fertilization rangeland (all combinations of 0; 10; 30 and 50 kg ha^-1 nitrogen, with 0 and 10 kg ha^-1 of phosphorus) in terms of dry matter production and botanical composition. After three years of fertilization, the botanical composition of the high-N fertilized plots changed completely from a climax to sub-climax vegetation. Wire grass (Elionurus muticus) showed the greatest decrease in frequency (62%) due to N fertilization. Phosphorus fertilization had an insignificant influence on species composition over the three years. The increase (P< 0.01) in production with increased N fertilizer, peaked in the second season, declining afterwards. With N and P fertilizer applied together, the production increased constantly and peaked in the last season. After three years the production increased (P≤ 0.01) with the application of N together with P, compared to the applying of only N. The higher the amount of fertilizer, the more sensitive to drought the climax grasses became. The results confirm the vulnerability of native grasses in dry areas, due to change in soil fertility.

Geological And Geochemical Analysis Of Phosphorus Bearing Minerals And Natural Glasses On Earth And In Meteorites: Implications Of The Origin Of Life, Tian Feng

USF Tampa Graduate Theses and Dissertations

Phosphorus is a key element in biogenic molecules and the mineral schreibersite is a major reactive phosphorus source for organic compounds on the prebiotic Earth. In this dissertation, a suite of reactions of phosphorus species, which originate from schreibersite minerals on chondrite meteorites and on the early Earth, have been studied to determine the intermediate geochemical pathways between phosphides and common minerals on meteorites and on the early earth.

I first investigated a unique blue fulgurite that was studied to clarify if this blue color was caused by rich phosphorus content, as has been reported for impact glasses that also …

Effect Of Combined Fertilization On Seed Production Of Xinnong‐1 Bermudagrass, Yanhui Zhang, Abulaiti, Peiying Li

IGC Proceedings (1977-2023)

No abstract provided.

Effects Of Phosphorus And Potassium On Alfalfa Seed Quality, Xianguo Wang, Jianguo Han, Zhiguang Geng, Peisheng Mao, Yunwen Wang

IGC Proceedings (1977-2023)

No abstract provided.

Forage Productivity Of Flemingia Macrophylla Under Different Planting Density, Defoliation Management And Phosphorus Application In Chitwan, Nepal, Ram Prasad Ghimire, Naba R. Devkota, Kishore Prasad Kayastha

IGC Proceedings (1977-2023)

No abstract provided.

Internal Loading Of Nitrogen (N) And Phosphorus (P), Reduced N Forms, And Periodic Mixing Support Cyanobacterial Harmful Algal Blooms (Habs) In Shallow, Eutrophic Honeoye Lake (New York, Usa), Justin Adam Myers

Browse all Theses and Dissertations

Cyanobacteria are important primary producers, but large cyanobacterial harmful algal blooms (HABs) have many negative ecological and health impacts and are becoming increasingly common. Honeoye Lake (New York, USA) is a shallow, eutrophic lake characterized by increasingly frequent HABs. Nitrogen (N) and phosphorus (P) loads often drive HABs in lakes, and sediment processes can contribute to N removal (e.g., denitrification) or loading (e.g., N fixation, remineralization). Sediment cores and lake water were collected during May–October (2016–2018) at two sites and incubated with no amendments (controls) or 15N stable isotopes to measure sediment nutrient fluxes and N cycling dynamics in Honeoye …

Sediment-Water Fluxes Of Phosphorus And Trace Metals In The Maumee River, Northwest Ohio, Emily L. Holliday

Browse all Theses and Dissertations

Excess phosphorus (P) and nitrogen (N) in the western basin of Lake Erie drive annual cyanobacteria blooms and associated hypoxia events. The Maumee River inputs ~5% of the water load into the western basin and ~50% of annual P loadings. I quantified seasonal variability of net P and metals fluxes from sediments in the Maumee River at four stations from Defiance, Ohio, to Maumee Bay. Upriver sediments were, on average, a total and filtered P sink throughout the year (−19 ± 7 and −6 ± 3, respectively; all fluxes represent `net flux’ reported in µmol m−2 h−1). At the river …

Enhancing Agroecosystem Phosphorus Management: Root Phenotyping And Decomposition For Improved Phosphorus Cycling, Rebecca Kay Mcgrail

Theses and Dissertations--Plant and Soil Sciences

Plant roots are often overlooked when making nutrient management decisions. Evaluating differences in P acquisition strategies and cycling resulting from years of shoot-specific plant breeding will aid in reducing fertilizer inputs, with the ultimate goal of improving economic sustainability of crop production and preservation of ecosystem services. To achieve this goal, this research screened a diverse panel of winter wheat cultivars that included old and modern, dwarfed and wild type varieties for physical and chemical root phenotypes related to P acquisition. Old cultivars had larger root systems with more roots that grew two times faster than intermediate/modern cultivars. Wild type …

Assessing And Understanding Non-Responsiveness Of Maize And Soybean To Fertilizer Applications In African Smallholder Farms, Dries Roobroeck, Cheryl A. Palm, Generose Nziguheba, Ray Weil, Bernard Vanlauwe

All Peer-Reviewed Publications

Use of mineral fertilizers is essential to enhance crop productivity in smallholder farming systems of Sub-Saharan Africa, but various studies have reported ‘non-responsiveness’ where application of inorganic fertilizers does not lead to satisfactory yield gains. This phenomenon is not well defined nor are its extent and causes well understood. In order to close these knowledge gaps, we assessed the effects of commonly recommended nitrogen (N), phosphorus (P) and/or potassium (K) fertilizer inputs on maize grain and soybean production on farmer fields across prevalent land slope and/or soil texture gradients (2 × 2 matrix) in four agroecosystems over two growing seasons. …

Corn And Soybean Response To Wastewater-Recycled Phosphorus Fertilizers, Shane Ylagan

Crop, Soil and Environmental Sciences Undergraduate Honors Theses

The ability to recycle phosphorus (P) from wastewaters could provide a sustainable, continuous source of P that might also help protect surface water quality from P enrichment. The mineral struvite (MgNH4PO4·6H2O) is an understudied material that can be created from Pcontaining wastewater and has been shown to have agricultural fertilizer value. The objective of this study was to evaluate the effects of electrochemically precipitated struvite (ECST), chemically precipitated struvite (Crystal Green; CG), diammonium phosphate (DAP), monoammonium phosphate (MAP), rock phosphate (RP), and triple super phosphate (TSP) on corn (Zea mays) and soybean (Glycine max) response in a 79-day greenhouse pot …

The Economic And Phosphorus‐Related Effects Of Precision Feeding And Forage Management In North Cameroon, A. D. Nkengafac, P. Tinta, G. Ayuk, M. Mansue, F. Fuh

IGC Proceedings (1977-2023)

No abstract provided.

Response Of Spatial Distribution Of Phosphorus In Soil To Wetlands Restoration In Yellow River, Delta Qiuyi Ding, Junhong Bai, Haifeng Gao

IGC Proceedings (1977-2023)

No abstract provided.

Effects Of Yearly Simulated Temperature Rise And Nitrogen Deposition On Soil Nutrient In The Songnen Meadow Steppes Of Northeast China, L. J. Hu, D. L. Wang, W. W. Wang, J. X. Guo

IGC Proceedings (1977-2023)

No abstract provided.

Short And Long Term Effects Of Lime And Gypsum Applications On Acid Soils In A Water-Limited Environment: 1. Grain Yield Response And Nutrient Concentration, Geoff Anderson, Shahab Pathan, James Easton, David Hall, Rajesh Sharma

Grain and Other Field Crops Research Articles

Surface (0–10 cm) and subsoil (soil layers below 10 cm) acidity and resulting aluminum (Al) toxicity reduce crop grain yields. In South Western Australia (SWA), these constraints affect 14.2 million hectares or 53% of the agricultural area. Both lime (L, CaCO3) and gypsum (G, CaSO4) application can decrease the toxic effect of Al, leading to an increase in crop grain yields. Within the region, it is unclear if G alone or the combined use of L and G has a role in alleviating soil acidity in SWA, due to low sulfate S (SO4–S) sorption properties of the soil. We present …

Response Of An Improved Pasture To Different Phosphoric Fertilisation Strategies In Basaltic Soils, D. F. Risso, R. Cuadro, A. Morón

IGC Proceedings (1977-2023)

No abstract provided.

Production, Botanical Composition And Nutrient Status Of An Originally Lolium Perenne--Dominant Sward Receiving Long‐Term Manure Applications, Wenju Liu, Y. G. Zhu, P. Christie, A. Scott Laidlaw

IGC Proceedings (1977-2023)

No abstract provided.

Effects Of Phosphate Fertilizer On Regrowth Of Medicago Sativa After Defoliation, Huixin Jiang, Yixin Shen, Guiyu Zhai

IGC Proceedings (1977-2023)

No abstract provided.

Root Phenotypic Plasticity In Response To P Deficiency In Two Tall Fescue Cultivars, Mónica G. Agnusdei, M. J. Martinefsky, A. Mollier, S. Pellerin, Silvia G. Assuero

IGC Proceedings (1977-2023)

No abstract provided.

Phosphorus Variability In The Area Of Influence Of The Mid-Barataria Sediment Diversion, Peter Mates

LSU Master's Theses

Man-made levees along the lower Mississippi River prevent delivery of sediment from building and maintaining Louisiana’s coastal wetlands. The Mid-Barataria sediment diversions is designed to reintroduce Mississippi River water, sediment, and nutrients into the sediment-starved Barataria Basin. Phosphorus (P) is an important macronutrient for regulating primary production in coastal marine ecosystems. Wetlands can serve as a sink or source for phosphorus to the overlying water column through various retention and release processes, dependent on concentration. Louisiana coastal systems can be phosphorus limited due to much higher concentrations of bioavailable Nitrogen in river water. The high soluble molar N:P ( >50:1) …

The Effect Of Soil Ph On Phosphorus Content Of Clover Pasture, David Weaver, Robert Summers, David Rogers, Peta Richards

Resource management technical reports

Testing of pasture soils from 2009 to 2018, as part of DPIRD’s Whole Farm Nutrient Mapping (WFNM) project in the coastal catchments of south-west Western Australia (WA), indicated that soil pH was so low it could be limiting plant access to nutrients. Observations by some farmers who had been involved in the soil testing were that lime application had not increased pasture production, even when pH_Ca (pH measured in calcium chloride) tests indicated that phosphorus (P) should become more available by increasing soil pH. Farmers also wanted to know if they needed to apply more P than soil testing …

Soil Amendment And Soil Testing As Nutrient Reduction Strategies For The Peel Integrated Water Initiative, Robert Summers, Peta Richards, David Weaver, David Rowe

Resource management technical reports

The Transform Peel program focuses on 42 000 hectares (ha) due east of Mandurah called the Peel Food Zone, 75 kilometres (km) south of Perth in the shires of Murray and Serpentine Jarrahdale and includes an assessment of intensified and enclosed agriculture and a business park. The Peel Integrated Water Initiative was developed through Transform Peel to identify water sources and minimise the effect of these projects on water quality by reducing the nutrient loads discharged into the Peel–Harvey Estuarine System, which has been suffering from poor water quality for this reason.

The mineral sand miner MZI Resources Pty Ltd …

Wayne E. Sabbe Arkansas Soil Fertility Studies 2019, Nathan A. Slaton

Arkansas Agricultural Experiment Station Research Series

Rapid technological changes in crop management and production require that the research efforts be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies described within will allow producers to compare their practices with the university’s research efforts. Additionally, soil-test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas.

A Proposal For Improving Pastures In Subsistence Farming Systems On The East India Plateau, Shivendra Kumar, Ashok Kumar, Peter Stuart Cornish

IGC Proceedings (1977-2023)

The East India Plateau (EIP) experiences deep poverty despite high rainfall (> 1200 mm). Livelihoods, once derived from Sal (Shorea robusta) forest, now depend on agriculture. Subsistence farmers practice monoculture rice-fallow on small, fragmented landholdings (total < 1 ha). Rice in the undulating landscape was traditionally grown in lowland drainage lines (Fig. 1) but population pressure has forced it onto adjacent terraced slopes (medium-uplands) that now comprise > 80% of the rice area (> 50% of land area). Rice is protected from grazing, but the watershed is otherwise grazed as common land with no pasture management. Grazed uplands are often degraded and unproductive, receiving no inputs. Livestock are limited to large animals providing draft power (males) and manure (fuel, compost), and goats for emergency finance.

Rainfall is not the primary …

Aplikasi Pupuk Organik Dan N, P, K Terhadap Ph Tanah, P-Tersedia, Serapan P, Dan Hasil Padi Hitam (Oryza Sativa L.) Pada Inceptisol, Anni Yuniarti, Eso Solihin, Ayuning Tiara Arief Putri

Jurnal Kultivasi

Padi hitam memiliki khasiat yang baik untuk kesehatan, yang dapat meningkatkan daya tahan tubuh terhadap penyakit, mencegah gangguan fungsi ginjal, mencegah kanker / tumor, dan banyak manfaat lainnya. Dewasa ini, produktivitas padi hitam masih relatif rendah, dengan beberapa penyebabnya adalah degradasi lahan dan ketidakseimbangan nutrisi di tanah. Salah satu ordo tanah yang distribusi secara luas di Indonesia yang dapat digunakan untuk budidaya tanaman adalah Inceptisol. Oleh karena itu, Inceptisols memerlukan penanganan yang tepat, seperti aplikasi pupuk organik dan anorganik yang seimbang. Tujuan dari penelitian ini adalah untuk mengetahui macam pupuk organik dan dosis N, P, K terbaik terhadap pH tanah, …

Effect Of Nitrogen And Phosphorus Application On Productivity, Nutrient Uptake And Quality Of Teosinte (Zea Mexicana L.) Fodder, Magan Singh, A. S. Harika, P. S. Oberoi, Rakesh Kumar

IGC Proceedings (1977-2023)

Teosinte (Zea mexicana L.) is popularly known as Makchari being a close relative of maize. It provides succulent, palatable and nutritive fodder during Kharif season for feeding the animals as green fodder or conserved fodder in the form of silage. Teosinte is an excellent multicut fodder which gives high yield of nutritious green lush fodder in 65-70 days with less inputs as compared to maize. Nitrogen is an essential component of proteins, nucleic acid, enzymes, coenzymes, chlorophyll and cell wall. Phosphorus plays a vital role in crop production as it is involved in CO₂ fixation, sugar metabolism, energy …

What Is The Effect Of Long-Term Cutting Versus Abandonment On The Vegetation And Chemical Properties In The Soil And The Herbage Of A Mountain Hay Meadow (Polygono-Trisetion)?, Pavlů Lenka, Pavlů Vilém, Hejcman Michal, Gaisler Jan

IGC Proceedings (1977-2023)

Polygono-Trisetion meadow communities are endangered in Europe. These meadows are common in the Alps, but in the past, such meadows were also common in the western alpine regions of Central Europe. The aim of our experiment was to find a suitable management regime for the maintenance of these Polygono-Trisetion grasslands and its effect on the vegetation and chemical properties of the soil and in the herbage.

Effects Of Phosphorus Fertilizer Application On Verano Stylo (Stylosanthes Hamata) For Fodder Production In Semi-Arid Nigeria, B. S. Malami, B. Usmani, S. A. Maigandi, A. Singh

IGC Proceedings (1977-2023)

Profitable ruminant livestock production in Nigeria is often constrained by an inadequate. Although natural grazing lands provide most forage for most animals, these pastures like those throughout most of the tropical world, are grossly deficient in energy, crude protein and minerals, particularly during the dry season, and so cannot meet the requirements for meat and milk production (Akinolai et al. 2010). Sown pastures have proved to a valuable technology to improve livestock nutrition. However, a major limitation to the use of sown tropical species is infertile soil. This is certainly the case in the north western region of Nigeria where …

Should Native Pastures Be Fertilised?, Jo I. Powells, Doug J. Alcock, Luke C. Pope, Denys Garden

IGC Proceedings (1977-2023)

Considerable research has been conducted in recent years demonstrating the ongoing benefits of phosphorus (P) fertiliser in achieving and maintaining higher levels of production from native pastures (Graham 2006; Garden et al. 2003; Lodge et al. 2003; Michalk et al. 2003). However Garden et al. (2003), Hill et al. (2004) and Dorrough et al. (2008) all question the sustainability of this practice by highlighting changes in species composition of these pastures with regard to increasing the introduced annual grass and broadleaf weed components at the expense of the native grasses and forbs but in …