Soil pH and Lime Requirement

McLean, E. O.

doi:10.2134/agronmonogr9.2.2ed.c12

Cited by 1,570 publications

(502 citation statements)

References 33 publications

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“…Composite soil samples were also collected immediately after harvesting from each site for investigating the changes in soil chemical properties due to treatments application. The soil samples were air dried, grounded to pass to 2 mm sieve, and analyzed for pH using 1:2.5 soil: water ratio (Mclean 1982); total nitrogen (N) using Kjeldahl digestion with sulfuric acid catalyzed by potassium sulfate (He et al 1990) and available phosphorous (P) using Mehlich III extraction method (Mehlich 2008) at the soil and plant nutrition laboratory of Kulumsa Agricultural Research Center.…”

Section: Soil Sampling Procedures and Chemical Analysismentioning

confidence: 99%

Malting barley response to integrated organic and mineral nutrient sources in Nitisol

Tadesse

Asrat

Admasu

et al. 2018

Int J Recycl Org Waste Agricult

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Purpose Depletion of soil fertility accounts for the low yield and quality of malting barley (Hordeum vulgare) in Ethiopia. Mineral fertilizers can counteract nutrient depletion but are unaffordable by low-input farmers. Organic amendments can contribute to correct soil degradation but are often unavailable in the required amounts. Therefore, this experiment was conducted to investigate the effects of combined use of organic and mineral amendments on the yield and quality of malting barley, and on selected soil chemical properties at Lemu-Bilbilo district in the southeastern highlands of Ethiopia. Methods Eight treatments were arranged in randomized complete block design with three replications to compare sole and integrated applications of organic and mineral nutrient sources on crop performance attributes and selected soil characteristics. Results Application of 2.82 t ha −1 compost or 1.07 t ha −1 farmyard manure (FYM) along with 18-10 kg ha −1 N-P gave 4234-4443 kg ha −1 grain yield with 15-17 and 32-39% increase over sole organic amendments and control, respectively, and 757% economic benefit. Combining organic and mineral fertilizers also gave 7-17 and 1-6% increase in available soil P and total N content of the soil. Conclusion Combined application of 50% recommended compost (RC) or 50% recommended FYM (RFYM) + 50% recommended NP (RNP) or 33% RC + 33% RFYM + 33% RNP enhanced yield, grain quality, soil attributes and economic benefits. Therefore, integration of organic and mineral amendments is recommended as best agronomic and economic optimum soil fertility management options for sustainable malting barley production in the southeastern highlands of Ethiopia.

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Section: Soil Sampling Procedures and Chemical Analysismentioning

confidence: 99%

Malting barley response to integrated organic and mineral nutrient sources in Nitisol

Tadesse

Asrat

Admasu

et al. 2018

Int J Recycl Org Waste Agricult

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“…Other subsamples were air dried and analyzed after passing through either a 1.0-mm (for texture and pH) or, following grinding, a 0.25-mm (for SOC content) mesh; note that the 1.0-to 2.0-mm fraction of soils on the CLP is generally negligible . Soil texture was determined by laser diffraction using a Mastersizer2000 (Malvern Instruments), and soil pH (1:5 in H 2 O) was determined using a pH meter with a glass electrode (McLean, 1982). The SOC content was measured using the Walkley-Black method (Nelson and Sommers, 1982).…”

Section: Soil Sampling and Chemical Analysismentioning

confidence: 99%

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Wang

Han

Jing-bo

et al. 2015

Soil Science Soc of Amer J

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An accurate evaluation of soil organic C (SoC) stocks is important to C management and to understanding fully the role of soils in the C cycle. However, SoC stocks in deep soils and the factors that affect them have been largely ignored. We measured SoC stocks and other soil properties to a depth of 500 cm (n = 73) under three land uses in the Lao ye Man Qu watershed on the Chinese Loess Plateau. Similar patterns in the vertical distributions of SoC stocks were found under cropland, grassland, and shrubland. However, for the 0-to 200-cm soil layer, SoC stocks were significantly lower under shrubland than under either cropland or grassland. The SoC stocks under cropland, grassland, and shrubland in the 0-to 100-cm layer were 2.64 ± 0.67, 2.50 ± 0.69, and 1.99 ± 0.22 kg m −2 , respectively; in the 0-to 500-cm layer they were 8.34 ± 2.26, 8.37 ± 2.01, and 7.26 ± 1.00 kg m −2 , respectively. Significantly higher SoC stocks occurred in loamy than sandy soils (P < 0.01), and they were lower at the mid than at the upper and lower slope positions. However, SoC stocks were similar in sunlit and shaded soils. Pearson correlation analysis indicated that land use, soil texture, and soil water content significantly affected SoC stocks in each 100-cm soil layer to a depth of 500 cm. Effects of topographic features and pH varied with increasing depth. A considerable amount of SoC was stored in deep soils, indicating the SoC content dependence on time and depth. This information is essential for evaluating C fluxes, estimating C stocks, and for managing the C cycles in regions around the world with deep soils.

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“…The particle-size distribution was determined by the pipette method (Gee & Bauder, 1986). Soil pH was measured by a pH meter with a 1:2.5 ratio of soil to water (Mclean, 1982). Total organic carbon was determined by the wet oxidation method (Nelson & Sommers, 1982).…”

Section: Soil and Biochar Analysesmentioning

confidence: 99%

Three‐dimensional pore structure and carbon distribution of macroaggregates in biochar‐amended soil

et al. 2015

European J Soil Science

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Summary Incorporation of biochar improves the physical properties of soil that are needed for plant growth; in particular, it stabilizes soil's aggregate structure. There has been little research, however, on the effects of biochar on three‐dimensional (3‐D) soil structure and carbon distribution within aggregates. To investigate the effects we amended two soil types (Ultisol and Vertisol) with three types of biochar (at the rate of 40 g biochar kg−1 soil). We separated the macroaggregates (5–7 cm in diameter) into two sets to study the distributions of intra‐aggregate pores and carbon. Synchrotron‐based X‐ray micro‐computed tomography (SR‐mCT) indicated that application of woodchip biochar (WCB) and waste‐water sludge biochar (WSB) increased significantly the porosities of macroaggregates, whereas straw biochar (SB) was less effective. The increased porosity of macroaggregates in the biochar‐amended soil is attributed to both the original porosity in the biochar and newly formed pores resulting from the interaction between the soil and the biochar. The addition of straw biochar has no obvious effect on the spatial distribution of pores in macroaggregates of either soil, whereas WCB and WSB changed the directional pore distribution of the Vertisol macroaggregates considerably. In the WCB‐ and WSB‐amended Ultisol, the number of pores increased in the outer parts of the macroaggregates, thereby greatly improving the exchange of air, water and nutrients with the adjacent soil matrix. Carbon mapping of the macroaggregates showed that the application of SB did not greatly increase the carbon content of macroaggregates compared with the control. The addition of WSB to the Ultisol markedly increased the carbon concentration of macroaggregates. The heat‐map analysis indicated that the effects of biochar on pore structure and carbon content depend on the type of biochar and soil. The combination of SR‐mCT and scanning electron microscopy (SEM) has been shown to be powerful for quantifying the pore characteristics and carbon distribution in soil macroaggregates.

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Soil pH and Lime Requirement

Cited by 1,570 publications

References 33 publications

Malting barley response to integrated organic and mineral nutrient sources in Nitisol

Malting barley response to integrated organic and mineral nutrient sources in Nitisol

Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Three‐dimensional pore structure and carbon distribution of macroaggregates in biochar‐amended soil

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