Download or read book Reaction of Rock Phosphorus in Some Brazilian Soils and Their Utilization by Plants written by P. Rosand Cabala and published by . This book was released on 1979 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: In three soil from southern Bahia(Brazil) a local (Patos) rock phosphorus wa compared with monocalcium phosphate and Gafsa and Morocco rock phosphates as a source of P by sorghum and by phosphate soil parameters. The utilization of Patos rock phosphate by two legumes and two grasses with VA mycorrhizal infection and NH4 or NO3 nitrogen nutrition was evaluated and, using soil blocks, pH gradients at different distances from the root plane were determined. Low fertilizer value was recorded for Patos rock phosphate, the effectiness of whic increased with storage time only in a clay soil having high organic matter content, CEC, and high adsorption capacity. In all soils Gafsa and Morocco showed equal or higher effectiveness than monocalcium phosphate. The low availability of Patos in related to its mineralogical composition, to low solubility in 2% citric acid and low amounts of phosphate extracted by anion exchange resin. The highest rate of P immobilization was recorded in a soil having a high content of Al and Fe extracted by dithionite and pyrophosphate, and also goethite and gibbsite as revealed by X-ray examination. The behaviour was note realed by x-ray examination. This behaviour was note related to the amounts of Al and Fe extracted by oxalate, exchangeable e Al or to the adsorption-dsorption properties using o,01M CaCl2 solutions. Phosphate extracted by anion exchange resin showed the best correlation with P uptake by sorghum, E value P soluble in water being second and third best. Poor correlations ...
Download or read book Reaction of rock phosphates in some brazilian soils and their utilization by plants written by P. C. Rosand and published by . This book was released on 1979 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: In three soils from southhern Bahia (Brazil) a local (Patos) rock phosphate was compared with monocalcium phosphate and Gafsa and Morocco rock phosphates as a source of P by sorghum and by phosphate soil parameters. The utilization of Patos rock phosphate by two legumes and two grasses with VA mycorrhizal infection and NH4 or NO3 nitrogen nutrition was evaluated and, using soil blocks, pH gradients at diffferent distances from the root plane were determined. Low fertilizer value was recorded for Patos rock phosphate, the effectiveness of which increased with storage time only in a clay soil having high organic matter content, CEC, and high adsorption capacity. In all soil Ga fsa and Morocco showed equal or highher effectiveness than monocalcium phosphate. The low availability of Patos is related to its mineralogical composition, to low solubility in 2% citric acid and low amounts of phosphate extracted by anion exchange resin.
Download or read book Reaction of Rock Phosphates in Some Brazilian Soils and Their Utilization by Plants written by P. Cabala Rosand and published by . This book was released on 1979 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: In three soil from southern Bahia(Brazil) a local (Patos) rock phosphorus was compared with monocalcium phosphate and Gafsa and Morocco rock phosphates as a source of P by sorghum and by phosphate soil parameters. The utilization of Patos rock phosphate by two legumes and two grasses with VA mycorrhizal infection and NH4 or NO3 nitrogen nutrition was evaluated and, using soil blocks, pH gradients at different distances from the root plane were determined. Low fertilizer value was recorded for Patos rock phosphate, the effectiness of whic increased with storage time only in a clay soil having high organic matter content, CEC, and high adsorption capacity. In all soils Gafsa and Morocco showed equal or higher effectiveness than monocalcium phosphate. The low availability of Patos in related to its mineralogical composition, to low solubility in 2% citric acid and low amounts of phosphate extracted by anion exchange resin. The highest rate of P immobilization was recorded in a soil having a high content of Al and Fe extracted by dithionite and pyrophosphate, and also goethite and gibbsite as revealed by X-ray examination. The behaviour was note realed by x-ray examination. This behaviour was note related to the amounts of Al and Fe extracted by oxalate, exchangeable e Al or to the adsorption-dsorption properties using o,01M CaCl2 solutions. Phosphate extracted by anion exchange resin showed the best correlation with P uptake by sorghum, E value P soluble in water being second and third best. Poor correlations ...
Download or read book Properties and Management of Soils in the Tropics written by Pedro A. Sanchez and published by Cambridge University Press. This book was released on 2019-01-10 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-awaited second edition of classic textbook, brought completely up to date, for courses on tropical soils, and reference for scientists and professionals.
Download or read book Legacy Phosphorus in Agriculture Role of Past Management and Perspectives for the Future written by Luke Gatiboni and published by Frontiers Media SA. This book was released on 2021-01-07 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactions of Phosphate with Some Ferruginous Brazilian Soils written by Timothy David Evans and published by . This book was released on 1972 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface samples of fifteen contrasting soils sorbed between 60 and 490 ug P/g of added P (500 ug P/g added as KH2PO4). Although P sorption was well correlated qith exchangeable Al (r = 0.84), its removal caused only a relatively small decrease in the amount of P sorbed. Removal of amorphous Fe and Al components by oxalate treatment reduced P sorption by 19 to 100%, compared to that of the untreated sample. Citratedithionite-bicarbonate (CDB) treatment removed large amounts of Fe and associated Al but the reduction in P sorption after CDB (-12 to 84% compared to that of the untreated sample) was less than after oxalate treatment. Sorption of added P was always better correlated with the Al parameters than with the Fe parameters considered. It is difficult to identify by selective sequential dissolution techniques the soil parameters most responsible for P sorption because they are themselves correlated to a considerable degree. Sorption of added P following CDB was well correlated with the amount of amorphous aluminosllicates (defined by alkall dissolution) in the soils (r = 0.99) which were probably occluded within crystalline iron oxides and exposed by CDB treatment. Amorphous aluminosillicates in the soils sorbed substantial amounts of added P and also had native inorganic P associated with them which accounted for up to 44% of the total soil P. Several studies have show that a high proportion of the soils from tropical and sub-tropical regions, which fall within the great soil groups of Oxisol (Latossols).......
Download or read book The Role of Carbon Dioxide in the Utilization of Rock Phosphate by Plants written by Eugene Carter Doll and published by . This book was released on 1953 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Factors Affecting the Utilization of Phosphoric Acid in Soils by Plants in Pot Experiments written by George Stronach Fraps and published by . This book was released on 1944 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ABSTRACT INFLUENCE OF ROCK PHOSPHATE ON AVAILABLE PHOSPHORUS AS MEASURED BY PLANT UPTAKE AND SOIL EXTRACTANTS written by JOSE ESPINOSA and published by INIAP Archivo Historico. This book was released on with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Factors Affecting the Solubility of Phosphorus in Soils written by Russell H. Austin and published by . This book was released on 1925 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nutrient Use in Crop Production written by Zdenko Rengel and published by CRC Press. This book was released on 2017-12-14 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you?re an agronomist, horticulturalist, plant and soil scientist, breeder, or soil microbiologist, you?ll want to read Nutrient Use in Crop Production to find everything you need to know about judicious nutrient management and maximizing nutrient utilization in the agricultural landscape. In this book, you?ll discover ways to minimize undesirable nutrient losses and techniques for preserving the environment while meeting the challenges of providing the earth?s increasing population with sufficient food, feed, and fiber to sustain life. Your existing knowledge base concerning this vital area of science will expand and grow as you become more open to the new ideas and applications contained in Nutrient Use in Crop Production. Most importantly, you?ll avoid the narrow scope found in most crop nutrition books and take a broader, more globally minded view of how to maximize nutrient use and minimize nutrient losses in the soil of agricultural systems. Specifically, you?ll find these and other areas covered: population growth, food production, and nutrient requirements managing soil fertility decline the role of nitrogen fixation in crop production delivering fertilizers through seed coatings micronutrient fertilizers the role of nutrient-efficient crops in modern agriculture Feeding the world without depleting the world?s viable soil nutrients is a monumental task--but one that can be achieved, as evidenced in the pages of Nutrient Use in Crop Production. You and your circle of students, professionals, and administrators will benefit greatly from this in-depth view of nutrient use in both developed and non-industrialized counties to give you a better sense of how to allow both the world and the world?s crops to grow.
Download or read book Utilization of Soil Organic Phosphorus by Plants written by Rupert Edward Clark and published by . This book was released on 1952 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilizer Abstracts written by and published by . This book was released on 1969 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Organic Matter in Modern Agriculture written by Y. Chen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of organic residues as a means of maintaining and increasing soil fertility is of long-standing. This tradition has been somewhat neglected since the introduc tion of mineral fertilizers at low cost. More and more farmers and scientists are now showing renewed interest in the proper and effective use of org~tnic residues, composts and other recycled organic additives. The role and function of organic amendments in modern agricultural systems have become topics of major interest in the scientific and agricultural communities. Research work on residue disposal has provided new concepts on the interaction between organic components and soils as well as new handling technologies (e. g. pelletizing of organic residues). The trend to conserve energy has led scientists to study the minimal tillage system, to find ways of replacing conventional inorganic fertilizers with natural organic prod ucts or microbial preparations, and to develop new composting methods. The drive to achieve higher yields in commercial greenhouse farming has led to a search for optimum substrates as growth media and for improved management techniques. This has led to the introduction of organic substitutes for peat, nota bly those originating from agricultural wastes. Another important aspect is the current interest in organic farming, where use of synthetic chemicals is avoided or prohibited. An increasing percentage of the population in highly developed countries is willing to pay premium prices for food produced on soils where inorganic fertilizers and other agricultural chemicals have not been used.
Download or read book Utilization of Phosphate Rock in Tropical Soils of Latin America written by Centro Internacional de Agricultura Tropical and published by . This book was released on 1978 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Regulating Plant Availability of Phosphate Applied to Brazilian Soils written by Lenom J. Cajuste and published by . This book was released on 1972 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sulfur Oxidation Influence on Rock Phosphate Solubilization in Soil written by Osni Correa de Souza and published by . This book was released on 1985 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low solubility of many rock phosphate (RP) around the world is the main cause of their ineffectiveness when applied to soil as a source of P for crops. The low solubility decreases their value as P fertilizers and prevents their widespread use, especially for high P demanding crops. One method proposed to enhance RP solubility is to add sulfur (S) as an amendment. The oxidation of S to H2SO4 in the soil results in dissolution of the applied RP. This study tested three Brazilian RP sources (Araxa, Catalao, and Patos de Minas) mixed with S at a ratio of 5:1 (RP:S). The application of the RP-S mixtures proved to be a promising alternative method for increasing RP solubility and thus their effectiveness as P sources. The soil pH decreased proportionally to increasing rates of RP-S application. The NaHCO3 extractable soil P increased as a consequence of increased soil acidefication. The ryegrass growth, P uptake, plant P concentration and P recovered from RP sources were enhanced only when S was mixed with the RPs. On the other hand, when RP sources were applied directly without S, the available soil P as measured by NaHCO3 extraction was depleted with time regardless of source or rate of RP. The inefficiency of the directly applied RP sources to supply adequate P was evidenced by less plant growth than applied with S. Also, in addition to this inadequate supply of for plant assimilation, the directly applied RP sources failed to develop a residual reserve of available P in the soil, even at very high application ...
