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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">esoil</journal-id><journal-title-group><journal-title xml:lang="ru">Бюллетень Почвенного института имени В.В. Докучаева</journal-title><trans-title-group xml:lang="en"><trans-title>Dokuchaev Soil Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0136-1694</issn><issn pub-type="epub">2312-4202</issn><publisher><publisher-name>V.V. Dokuchaev Soil Science Institute</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.19047/0136-1694-2019-99-145-170</article-id><article-id custom-type="elpub" pub-id-type="custom">esoil-388</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Состав, свойства и особенности плодородия красной ферраллитной почвы пятилетней залежи в Республике Чад</article-title><trans-title-group xml:lang="en"><trans-title>Evaluation of the composition, properties and fertility of Haplic Ferralsol on the fields abandoned for five years in the Republic of Chad</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Якума</surname><given-names>Е. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Yakouma</surname><given-names>E. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117198, Москва, ул. Миклухо-Маклая, 6</p></bio><bio xml:lang="en"><p>6 Miklukho-Maklaya Str., Moscow 117198</p></bio><email xlink:type="simple">gahayakouma@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кой</surname><given-names>K.</given-names></name><name name-style="western" xml:lang="en"><surname>Koy</surname><given-names>K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117198, Москва, ул. Миклухо-Маклая, 6</p></bio><bio xml:lang="en"><p>6 Miklukho-Maklaya Str., Moscow 117198</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Азовцева</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Azovtseva</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119017, Москва, Пыжевский пер, 7, стр. 2</p></bio><bio xml:lang="en"><p>7 Bld. 2 Pyzhevskiy per., Moscow 2119017</p></bio><email xlink:type="simple">azovtseva@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пивень</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Piven</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117198, Москва, ул. Миклухо-Маклая, 6</p></bio><bio xml:lang="en"><p>6 Miklukho-Maklaya Str., Moscow 117198</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шуравилин</surname><given-names>А. В. </given-names></name><name name-style="western" xml:lang="en"><surname>Shuravilin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117198, Москва, ул. Миклухо-Маклая, 6</p></bio><bio xml:lang="en"><p>6 Miklukho-Maklaya Str., Moscow 117198</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Российский университет дружбы народов</institution><country>Россия</country></aff><aff xml:lang="en"><institution>RUDN University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Почвенный институт им. В.В. Докучаева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>V.V. Dokuchaev Soil Science Institute</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>09</day><month>12</month><year>2019</year></pub-date><volume>0</volume><issue>99</issue><fpage>145</fpage><lpage>170</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Якума Е.Г., Кой K., Азовцева Н.А., Пивень Е.А., Шуравилин А.В., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Якума Е.Г., Кой K., Азовцева Н.А., Пивень Е.А., Шуравилин А.В.</copyright-holder><copyright-holder xml:lang="en">Yakouma E.G., Koy K., Azovtseva N.A., Piven E.A., Shuravilin A.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://bulletin.esoil.ru/jour/article/view/388">https://bulletin.esoil.ru/jour/article/view/388</self-uri><abstract><p>Цель исследований состояла в изучении состава и свойств красной ферраллитной почвы пятилетней залежи в Республике Чад для определения возможности ее использования под культуру хлопчатника. Дана оценка морфологического строения почвы, изучены гранулометрический и валовой состав, емкость катионного обмена и содержание обменных катионов, агрохимические и агрофизические свойства по почвенным горизонтам. Красные ферраллитные почвы региона обладают большой мощностью почвенного профиля и постепенным переходом между генетическими горизонтами, а также имеют облегченный гранулометрический состав верхней части профиля. Основу валового химического состава красных ферраллитных почв составляют SiO2, Fe2O3 и Al2O3, которые по глубине почвенного профиля варьируют в пределах 61.83–82.73 %, 3.50–6.40 % и 11.46–29.25 % соответственно. Почвы характеризуются низкой емкостью катионного обмена (6.6–11.1 cмоль (экв)/кг. Среди обменных катионов определяющим является кальций (Ca2+). В верхних почвенных слоях содержание гумуса составляет 1.53–1.66 %. Почвы характеризуются кислой реакцией – от средне кислой в верхних горизонтах до очень сильно кислой в нижнем горизонте. Содержание подвижных соединений фосфора и калия в профиле составляет соответственно 0.76–1.09 мг/100 г и 0.05–1.48 мг/100 г. По своим агрофизическим свойствам почвы могут использоваться для возделывания хлопчатника. В верхнем слое (0–42 см) плотность почвы составляет 1.36–1.45 г/см3, общая пористость – 45.9–48.9 % и наименьшая влагоемкость – 22.4–25.7 %.</p></abstract><trans-abstract xml:lang="en"><p>The article deals with the fertility of red ferralitic soils in the Republic of Chad. The studies were carried out in the period between 2016 and 2018 in the southern part of the province of Moundou on the red ferralitic soils (Haplic Ferralsol)of the Cotton-Chad farm, which cultivates cotton first of its formation. Haplic Ferralsols are characterized by significant reservoir thickness and are not rich in nutrients. The aim of our research was to study the composition and properties of the Haplic Ferralsols of the fields abandoned for five years for their use under cotton export culture. We have evaluated the morphological structure of the soil on neglected fields and its description by genetic horizons, studied the particle size distribution of the soil profile, its gross composition, cation exchange capacity, the content of exchangeable cations, and also considered the agrochemical and agrophysical properties of soil horizons. It has been established that Haplic Ferralsols have their own characteristics: red color, thick soil profile and a gradual transition between genetic horizons, and lightweight granulometric composition in the upper part of the profile. The basis of the gross chemical composition of Haplic Ferralsols is SiO2, Fe2O3 and Al2O3, the content of which varies depending on the depth of the soil profile within the ranges of 61.83–82.73 %, 3.50–6.40 % and 11.46–29.25 % correspondingly. Haplic Ferralsols are characterized by a high cation exchange capacity (6.6–11.1 сmol (eq)/kg). Among the exchangeable cations, calcium (Ca2+) is the most essential. Haplic Ferralsols are moderately provided with humus. In the upper soil layers (up to 42 cm), its content varied within 1.53–1.66 %. Soils are characterized by acidic reactions – from moderately acidic in the upper horizons to very strongly acidic in the lower horizon. The content of mobile compounds of phosphorus and potassium in the profile is low and very low, respectively, 0.76–1.09 mg/100 g and 0.05–1.48 mg/100 g. According to its agrophysical properties, the soil may be used for cotton growing. In the upper soil layer (0–42 cm) the bulk density is 1.36–1.45 g/cm3, the total porosity is 45.9–48.9 % and the field water-holding capacity is 22.4–25.7 %.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гранулометрический состав</kwd><kwd>валовой состав</kwd><kwd>емкость катионов обмена</kwd><kwd>гумус</kwd><kwd>кислотность</kwd><kwd>подвижный фосфор</kwd><kwd>подвижный калий</kwd><kwd>плотность сложения</kwd><kwd>пористость</kwd><kwd>наименьшая влагоемкость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>grain-size distribution</kwd><kwd>gross composition</kwd><kwd>capacity of exchange cations</kwd><kwd>humus</kwd><kwd>acidity</kwd><kwd>labile phosphorus</kwd><kwd>labile potassium</kwd><kwd>bulk density</kwd><kwd>porosity</kwd><kwd>field moisture capacity</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Аринушкина Е.В. Руководство по химическому анализу почв. 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