@article{rippy_nelson_hesterberg_niedziela_kamprath_bilderback_2016, title={Importance of Limestone Specific Surface for Assessing Neutralization Effectiveness in Soilless Root Substrate}, volume={47}, ISSN={["1532-2416"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84961212516&partnerID=MN8TOARS}, DOI={10.1080/00103624.2016.1141926}, abstractNote={ABSTRACT The relationship of specific surface to particle diameter and calcium carbonate (CaCO3) content of limestone was examined. Limestones obtained from 20 North American quarries were wet sieved into eight particle diameter fractions (600 to ˂38 µm). Specific surface of particles was measured in each fraction following the Brunauer-Emmett-Teller theory. The range in specific surface across the 20 sources varied from 74-fold in the coarsest particles (600–300 µm) to 20-fold in the finest particles (˂38 µm). The pattern of specific surface progressing from the coarsest to the finest particles varied radically between sources. The relationship between specific surface and CaCO3 content was likewise very weak. While particle diameter and CaCO3 equivalent remain the traditional measurements for defining limestone for field production, specific surface provides additional information valuable to define the stricter neutralization capacities of limestone for soilless root substrates.}, number={4}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, author={Rippy, Janet F. M. and Nelson, Paul V. and Hesterberg, Dean L. and Niedziela, Carl E., Jr. and Kamprath, Eugene J. and Bilderback, Ted}, year={2016}, month={Feb}, pages={521–526} }
 @article{rippy_nelson_hesterberg_kamprath_2007, title={Reaction times of twenty limestones}, volume={38}, ISSN={["1532-2416"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34447308205&partnerID=MN8TOARS}, DOI={10.1080/00103620701435530}, abstractNote={Abstract Particle size and calcium carbonate equivalent characterize agricultural limestone. When agricultural limestone is used for horticultural container substrates, variations in pH among batches of substrate produced with the same limestone rate, as well as pH drift from initial pH, occur. Horticultural endeavors require more detailed characterization of limestone neutralization capacity than is provided for agricultural limestones. Reactivity of twenty limestones encompassing a broad range of calcium and magnesium carbonate were compared. Limestones were wet‐sieved into three particle‐diameter fractions and reacted with ammonium chloride in the presence of steam. Fine particles reacted faster than coarse; however, there was a point beyond which degree of fineness of calcitic limestone no longer affected reactivity. Dolomitic limestones were slower reacting than calcitic. Reactivity within particle fractions of dolomitic and coarse calcitic limestones varied significantly. These results indicate that particle diameter and calcium carbonate equivalent are not the only factors influencing limestone neutralization capacity.}, number={13-14}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, author={Rippy, Janet F. M. and Nelson, Paul V. and Hesterberg, Dean L. and Kamprath, Eugene J.}, year={2007}, pages={1775–1783} }
 @book{sumner_warrick_huang_paul_kamprath_wilding_stucki_shainberg_baumgardner_2000, title={Handbook of soil science}, ISBN={0849331366}, publisher={Boca Raton, FL: CRC Press}, author={Sumner, M. E. and Warrick, A. W. and Huang, P. M. and Paul, E. A. and Kamprath, E. J. and Wilding, L. P. and Stucki, J. W. and Shainberg, I. and Baumgardner, M. F.}, year={2000} }
 @article{kamprath_1999, title={Changes in phosphate availability of ultisols with long-term cropping}, volume={30}, ISSN={["0010-3624"]}, DOI={10.1080/00103629909370256}, abstractNote={Abstract Many soils in the southeastern United States have high levels of available P. Long‐term field studies were conducted to determine the amount of phosphorus (P) that could be supplied before corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] responded to P fertilization and changes that occurred in soil test P. The soils were a Norfolk loamy sand (fine‐loamy, siliceous, thermic Typic Kandiudult), Lynchburg loamy fine sand (fine‐loamy, siliceous, semiactive, thermic Aeric Paleaquult), and a Davidson clay loam (clayey, kaolintic, thermic Rhodic Kandiudult). Phosphorus as concentrated superphosphate was broadcast annually at rates of 0, 10, 20, and 40 kg P ha‐1. Response to P was obtained the 13th year of the study on the Davidson and the 14th year on the Norfolk. No response was obtained on the Lynchburg which had the highest level of available P. The Davidson soil supplied 130 kg P ha‐1 and the Norfolk 204 kg P ha‐1 before a response was obtained. The Lynchburg supplied 178 kg P ha‐1 during the...}, number={7-8}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, author={Kamprath, EJ}, year={1999}, month={Apr}, pages={909–919} }
 @misc{buol_kamprath_1998, title={A comparison of the contributions of clay, silt, and organic matter to the effective CEC of soils in sub-Saharan Africa}, volume={163}, ISSN={["0038-075X"]}, DOI={10.1097/00010694-199806000-00009}, number={6}, journal={SOIL SCIENCE}, author={Buol, S and Kamprath, EJ}, year={1998}, month={Jun}, pages={508–508} }
 @article{schmidt_buol_kamprath_1997, title={Soil phosphorus dynamics during 17 years of continuous cultivation: A method to estimate long-term P availability}, volume={78}, ISSN={["0016-7061"]}, DOI={10.1016/S0016-7061(97)00011-6}, abstractNote={The ability to predict long-term plant-availability of soil P provides an additional management tool for sustainable agriculture. Our objective is to present a methodology using P fractionation data for predicting long-term plant-availability of soil P. Soil samples were collected (0–30 cm) in 1975, 1985, and 1992 from two continually cropped field trials. Soils were a Norfolk loamy sand and a Davidson clay loam, two Ultisols from North Carolina, USA. Four rates of P were applied from 1975 to 1986, and subsequently discontinued. The relationships between the resin and inorganic NaHCO3 fractions, and between the inorganic NaHCO3 and NaOH fractions, indicated that some level of equilibrium appeared to exist between these three fractions of soil P. Given this equilibrium condition, removal of resin P, as the most plant-available fraction, would subsequently reduce the levels of P in the inorganic NaHCO3 and NaOH fractions. Conversely, adding P as fertilizer would increase P in the resin fraction with a subsequent increase in the inorganic NaHCO3 and NaOH fractions. Although P applied as fertilizer was not completely accounted for in crop removal or net change in soil P, estimated numbers of crops based on our model for predicting available P reflected trends in yields at these two field sites. Sixteen and five crops were estimated for the Norfolk and Davidson soils, respectively. Both corn and soybean yields continued to be high on the Norfolk soil through 1992, while corn yields had declined after 1985 on the Davidson soil. Quantifying the long-term availability of soil P provides some measure of potential return on a capital investment of P fertilization in low-input agriculture.}, number={1-2}, journal={GEODERMA}, author={Schmidt, JP and Buol, SW and Kamprath, EJ}, year={1997}, month={Jul}, pages={59–70} }
 @article{kamprath_1991, title={Appropriate measurements of phosphorus availability in soils of the semi-arid tropics}, ISBN={929066200X}, journal={Phosphorous nutrition of grain legumes in the semi-arid tropics}, publisher={Patancheru,Andhra Pradesh, India : International Crops Research Institute for the Semi-Arid Tropics}, author={Kamprath, E. J.}, editor={C. Johansen, K. K. Lee and Sahrawat, K. L.Editors}, year={1991}, pages={23} }
 @article{kamprath_1989, title={EFFECT OF STARTER FERTILIZER ON EARLY SOYBEAN GROWTH AND GRAIN-YIELD ON COASTAL-PLAIN SOILS}, volume={2}, ISSN={["0890-8524"]}, DOI={10.2134/jpa1989.0318}, abstractNote={Questions arise as to the response of soybeans [Glycine max (L.) Merr.] to starter fertilization on soils with medium soil test levels. Studies were conducted for two years on Coastal Plain soils to determine the response to P, K, and S in starter fertilizers. Rates of application were 0 or 9 lb/acre of P, 17 lb/acre K, and 20 lb/acre S. Dry weight and nutrient concentration were measured S wk after planting; leaf nutrient concentration was measured at flowering; and yield were measured at maturity. Responses to P fertilization were not obtained on sandy Coastal Plain soils with soil test P values > 80 lb/acre nor on poorly drained soils with soil test P values > 54 lb/acre. Potassium application did not increase soybean yields on soils with soil test K values > 140 lb/acre. No response was obtained with S fertilizer on these soils. Phosphorus recommemendations for soils with medium soil test levels are greater than amounts of P removed in the grain. Potassium recommendations at soil test K levels of 140 to 155 lb/acre supplied slightly more than amounts removed in the grain. Leaf nutrient concentrations of P, K, and S at flowering were in the sufficiency range, indicating that at the upper part of the medium availability level the soils can supply adequate amounts of P and K.}, number={4}, journal={JOURNAL OF PRODUCTION AGRICULTURE}, author={KAMPRATH, EJ}, year={1989}, pages={318–320} }
 @inbook{kamprath_1984, title={Crop response to lime on soils in the tropics}, ISBN={9780891180807}, DOI={10.2134/agronmonogr12.2ed.c9}, abstractNote={Response of crops to liming is mainly a result of neutralization of aluminum, manganese, and hydrogen toxicities and the supplying of calcium, magnesium, or both. With acid soils of the tropics, anyone of these factors may be related to increased growth. In many of the early studies on liming, only pH was measured so that the causative factor responsible for growth could not be identified. R.W. Pearson compiled an excellent review of crop response to liming in the tropics. This chapter presents a summary of his conclusions along with an examination of selected studies on crop responses to liming in various tropical areas where acid infertility factors were identified. The expanded research to increase food production in the tropics has resulted in new research on liming to identify those acid soil factors limiting growth. These studies have provided the necessary data for developing sound liming practices for soils in the tropics.}, booktitle={Soil acidity and liming (2nd ed.)}, publisher={Madison: American Society of Agronomy, Inc}, author={Kamprath, E. J.}, year={1984}, pages={349} }
 @inbook{kamprath_till_1983, title={Sulfur cycling in the tropics}, ISBN={9780858345140}, booktitle={Sulfur in South-East Asian and South Pacific agriculture}, publisher={Armidale, New South Wales:  Australian Development Assistance Bureau (ADAB)}, author={Kamprath, E. J. and Till, A. R.}, editor={G. J. Blair and Till, A. R.Editors}, year={1983}, pages={1} }