157 results for group: agrogeology-2


The combination of crushed rock and organic matter enhances the capture of inorganic carbon in tropical soils

F. P. Medeiros, S. H. Theodoro, A. M. X. Carvalho, V. S. Oliveira, L. C. Oliveira ABSTRACT: The use of remineralizers (REM) derived from crushed rocks has become an important option to ensure soil fertility and food and nutritional security, as well as a potential mechanism to capture CO2 efficiently, helping to mitigate climate change. The objective of this article is to present the direct and indirect effects of the use of REM in carbon capture processes through accelerated rock weathering. The tests were carried out in leaching columns where a type of rock (R), characterized as kamafugite, was used at a dosage equivalent to 40 t ha-1 incorp...

The potential for glacial flour to impact soil fertility, crop yield and nutrition in mountain regions

Sarah Tingey, Jemma L. Wadham, Jonathan Telling, Shannon Flynn, Jonathan R. Hawkings ABSTRACT: Novel sustainable agricultural strategies that enhance soil nutrients and human nutrition are crucial for meeting global food production needs. Here, we evaluate the potential of "glacial flour," a naturally crushed rock produced by glaciers known to be rich in nutrients (P, K, and micronutrients) needed for plant growth. Our proof-of-concept study, investigated soybean (<i>Glycine max.</i> var. Black jet) growth, yield, and nutrient content with soil supplementation from glacial flour sourced from Himalayan glaciers (meta-sediment gneiss ...

GEMAS: Boron as a geochemical proxy for weathering of European agricultural soil

Philippe Négrel, Anna Ladenberger, Alecos Demetriades, Clemens Reimann, Manfred Birke, Martiya Sadeghi ABSTRACT: About a century ago, B was recognised as an essential element for the normal growth of plants and terrestrial organisms. Limitations for plant development have been recognised in agricultural systems, particularly in highly weathered soil. Boron is rarely analysed in whole rock or soil analysis, as it requires specific analytical techniques. It is often determined, after partial extraction (aqua regia or CaCl), usually on a limited number of samples. Many more questions than answers exist about the environmental behaviour of B. We ...

Origin of the silicic volcanic rocks of the Early Permian Panjal Traps, Kashmir, India

J. Gregory Shellnutt, Ghulam M. Bhat, Kuo-Lung Wang, Michael E. Brookfield, Jaroslav Dostal, Bor-Ming Jahn ABSTRACT: The Panjal Traps of Kashmir, India represent a significant outpouring of mafic and silicic volcanic rocks during the Early Permian and are synchronous with the opening of the Neotethys Ocean. Previous studies have suggested that the silicic volcanic rocks are derived by differentiation of mafic magmas. Dacites and rhyolites collected from the lower portions of the volcanic pile near Pampore, Kashmir are peraluminous (ANCK>1.0) in composition. Their calculated whole rock ISr values are variable (ISr=0.69307 to 0.71825) and ...

Multiple mantle sources of the Early Permian Panjal Traps, Kashmir, India

J. Gregory Shellnutt, Ghulam M. Bhat,Kuo-Lung Wang, Meng-Wan Yeh, Michael E. Brookfield, Bor-ming Jahn ABSTRACT: The Early Permian Panjal Traps of northern India are the volcanic remnants of continental rifting that led to the formation of the Neotethys Ocean and the ribbon-like continent Cimmeria. The Traps are one of at least five major mafic eruptions of flood basalts during the Late Palaeozoic however their origin and petrogenesis are poorly constrained. Basalts from the Kashmir Valley were collected and analyzed for chemical and isotopic (Sr, Nd) compositions in order to characterize their mantle source and evaluate the petrogenetic ...

Residual effects of direct application of Burkina Faso phosphate rock on rice cultivation in Ghana

ABSTRACT: Soil phosphorus deficiency is a critical constraint in crop production in Sub-Saharan Africa (SSA). Although phosphate rock (PR) deposits have been found in the region, they have not been well-utilised due to low reactivity, limited markets, lack of effective extension systems and other factors. However, previous studies indicate that direct application of these PRs are effective for lowland rice cultivation, although the residual effects of this application on rice yields have not been fully examined. We research the residual effects of PR direct application on rice yields in two typical agro-ecological zones for lowland rice cultivation ...

Applying minerals to soil to draw down atmospheric carbon dioxide through synergistic organic and inorganic pathways

ABSTRACT: Minerals in soil can sequester atmospheric carbon dioxide through natural organic and inorganic processes. Here we consider three soil- and mineral-based methods for carbon dioxide removal: (1) grinding and spreading of calcium- and magnesium-rich silicate rocks for enhanced rock weathering and subsequent inorganic carbon formation, (2) mineral doping of biomass prior to conversion into biochar for enhanced biochar carbon yield and stability, and (3) strategic application of minerals to soil to increase soil organic carbon accrual and stability. We argue that there are powerful synergies between these approaches for carbon dioxide removal ...

Wollastonite powder application increases rice yield and CO2 sequestration in a paddy field in Northeast China

ABSTRACT: Background and aims Enhanced silicate rock weathering (ERW) on cropland soils can increase crop yield and promote carbon dioxide (CO2) sequestration. Applying silicate rock powder to flooded rice paddies can promote weathering, but the effects of ERW on rice production and CO2 removal rates in the field remain unclear. Methods We investigated the effects of adding wollastonite (CaSiO3) powder (5 t ha−1) to rice paddy plots on soil properties, rice yield, rice grain quality, grain arsenic, grain cadmium, and soil CO2 sequestration in Liaoning Province, Northeast China. Results Wollastonite application increased soil pH, soil ...

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

ABSTRACT: The increasing world population has led into big food and raw material demand, with high pressure on agriculture. In Brazil, potassium fertilizers are mostly imported rising interest on rocks and mining rejects as alternative sources. The objective of this work was to evaluate the effect of crushed rocks over mineral nutrition, yield and efficiency of potash fertilization in rice. The experiment was carried out under greenhouse conditions in pots with 3.7 kg of Oxisol soil samples. The experimental design was completely randomized, in a factorial layout 4 × 6, comprising six crushed rocks used as alternative multinutrient fertilizer ...

Rock dust as a source of nutrients for upland rice crop

ABSTRACT: Some farmers use rock dust as a cheap and efficient alternative to supply nutrients to plants. It is known that rock dust has the potential to replace chemical fertilization in organic production or it may complement chemical fertilization in other production systems. Thereby, the aim of this research was to evaluate the response of upland rice under different doses of rock dust. The experiment was carried out at Fazenda Cachoeira, Raul Soares city, Minas Gerais (MG), Brazil with an altitude corresponding to 360 m, sandy-clay soil. It was used BRSMG Caravera cultivar. Analysis of rock dust and soil before and after fertilization were ...