Revisiting nitic horizon properties of Nitisols in SW Ethiopia

Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification

“…Furthermore, the size of Hm and Gt crystals was smaller (< 5 nm; Table 5) than that observed in Oxisols (Melo et al, 2001;Lima et al, 2017). Thus, high Kt content favors the development of a block structure rather than a granular microstructure in the B horizons (De Wispelaere et al, 2015). No evidence of coalescence of microstructures nor transformation from small granular to blocky or prismatic aggregates were observed, as was proposed by Cooper et al (2010).…”

Genesis and Classification of Nitisols from Volcano-Sedimentary Lithology in Northeastern Brazil

“…Soils with a nitic horizon are predominantly derived from basic to intermediate rocks Vidal-Torrado, 2000, 2005;Cooper et al, 2010;Santos et al, 2013;Soil Survey Staff, 2014;De Wispelaere et al, 2015), including the Nitossolos of the Cabo Basin (Oliveira et al, 2004;Neves et al, 2018;). In contrast to the studies mentioned and to P1 and P2 of the present study, the P3 profile (footslope), in addition to basalt, is formed from sedimentary rocks richer in SiO 2 , since the blocks and the matrix of the conglomerate package present a typical granitic composition (Alheiros and Ferreira, 1989), contributing to an unusual formation of Nitossolo associated with acidic and basic rocks.…”

“…Basic and intermediate rocks are widely documented as the parent lithology for soils with a nitic horizon (Cooper and Vidal-Torrado, 2000;Cooper et al, 2010;Melo et al, 2010;Soil Survey Staff, 2014;De Wispelaere et al, 2015). The Nitossolos developed from basalt throughout Brazil (Brasil, 1972;Santos Filho et al, 1978;Araújo Filho et al, 2000;Tremocoldi, 2003;Oliveira et al, 2004;Neves et al, 2018) generally present values of Fe 2 O 3 (sulfuric digestion) above 18 % and are classified as Nitossolos Vermelhos or Brunos (Santos et al, 2013).…”

Lime and Phosphorus Rates Response on Dry Matter Production and Partitioning of Hybrid of Coffee (&lt;i&gt;Coffea arabica&lt;/i&gt; L.) Seedlings Growth on Acidic Soil

“…Ethiopia is one of the major coffee producer in Africa and is the 6 th producer in the world contributing to about 4.8% of the total world coffee production [14]. Coffea arabica is an indigenous to the tropical rain forests of Ethiopia in the South and southwest where there was persistent usage since ancient times [6][7][8]. Coffee can adapt to different soil types and the soil requirements for sustainable high yield of arabica coffee should be of deep profile, over about 180 cm, moderately to heavy texture, good drainage and of high organic matter content [4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…Coffea arabica is an indigenous to the tropical rain forests of Ethiopia in the South and southwest where there was persistent usage since ancient times [6][7][8]. Coffee can adapt to different soil types and the soil requirements for sustainable high yield of arabica coffee should be of deep profile, over about 180 cm, moderately to heavy texture, good drainage and of high organic matter content [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. It can then be inferred that the infertility of the coffee soils in the western, south-western, and southern parts of Ethiopia can be attributed to excessive accumulations of aluminum, iron and manganese causes for deficiencies in available phosphorus and basic cations [10][11][12][13][14][15][16][17][18][19][20][21].…”