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| Pavan,Marcos Antonio; Chaves,Júlio César Dias; Siqueira,Rubens; Androcioli Filho,Armando; Colozzi Filho,Arnaldo; Balota,Elcio Liborio. |
| The objective of this work was to evaluate the effect of coffee (Coffea arabica L.) population densities on the chemical and microbiological properties of an Oxisol. The work was carried out on soil samples of 0-20 cm depth originated from an experimental site which had been used for coffee tree spacing studies during 15 years, in Paraná State, Brazil. Eight coffee tree populations were evaluated: 7143, 3571, 2381, 1786, 1429, 1190, 1020, and 893 trees/ha. Increasing plant population increased soil pH, exchangeable Ca, Mg, K, extractable P, organic carbon, moisture content and coffee root colonization by vesicular arbuscular mycorrhizal fungi, and decreased exchangeable Al and microbial biomass. Such results were attributed to better erosion control,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Acid soil; Tree spacing. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000300018 |
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| Furtini Neto,Antonio Eduardo; Resende,Álvaro Vilela de; Vale,Fabiano Ribeiro do; Silva,Ivo Ribeiro. |
| The liming effects on the growth of fifteen woody species of Brazil were evaluated under glasshouse conditions. The species used belong to different ecologic groups, namely: pioneer, secondary and climax trees. The soil treatments consisted in the absence of liming (-LIM) and liming sufficient to reach soil pH 6.0 (+LIM). In general, the pioneer and secondary species presented higher responses in total dry matter production (TDM) to soil liming, whereas the TDM of the climax species were not affected by the soil treatments. Thus, the ranking of species in relation to soil acidity tolerance ranged from highly sensitive to highly tolerant. The pioneer and secondary species growing in limed soil (+LIM) showed higher calcium (Ca), magnesium (Mg) and phosphorus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acid soil; Ecological groups; Nutrient utilization efficiency. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000500014 |
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| Morello,Camilo de Lellis; Miranda Filho,José Branco de; Gorgulho,Eliana Patrícia. |
| In Brazil, acid soils represent a large portion of the agricultural area and the development of cultivars with tolerance to acidity has shown to be feasible. The identification of germoplasm potentially tolerant to acidity was the purpose of this work. Two distinct groups of maize (Zea mays L.) populations were crossed according to the partial diallel mating scheme: Group [1] with six adapted populations and Group [2] with seven exotic varieties. All varieties and crosses were evaluated under the condition of acid and low fertility soil. Traits analyzed were: EY- ear yield, PH- plant height and EH- ear height. Outstanding varieties per se, with yield higher than 3 t ha-1, were SUWAN-2, TAITINGA, TAIÚBA and IUBATÃ in Group [1]; and CUPURICO DMR, TUXPEÑO... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Partial diallel; Heterosis; Acid soil; Aluminum tolerance. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200014 |
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| Khairo, Salahadin A.; Norton, Mark R.; Garden, P.; Graham, Phil; Langford, Colin; Armstrong, P.; Brassil, T.. |
| Soil acidification is one of the major forms of soil degradation in higher rainfall areas of the tablelands of NSW. A grazing experiment was conducted near Sutton, NSW, to assess the effect of various rates of superphosphate, lime, sewage ash and stocking rates on wool production and sustainability between 1999 and 2008. The results from the discounted cash flow analysis show that the net present value of the treatment without lime, the lower rate of superphosphate and the lowest stocking rate returned the highest net present value of $266.30/ha. Raising the application of superphosphate from 125kg/ha every two to three years to 250kg/ha every year on un-limed and limed soil reduced the net present value by $278.70/ha and $249.30/ha, respectively. The... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Economic; Acid soil; Lime; Superphosphate; Sewage ash; Stocking rate; Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/47939 |
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| Sivapong Naruebal. |
| Survey and classification of highland rice cultivation areas to indicate acid soil crisis was conducted on altitude 700 meters above sea level. Soil sampling was conducted form 7 districts of Mae Hong Son province are namely Muang, Khun Yuam, Mae La Noi, Mae Sariang, Sop Muey, Pai and Pang Ma Pha in the year 2012-2013. A total of 115 soil samples were consisting of 68 paddies and 47 upland conditions. Soil samples were analysis to find out the soil pH. The result showed that the strongly acid, moderately acid and slightly acid are 39.13, 21.74 and 20.86 percentages, respectively. In other hand, the natural, very strongly acid and extremely acid are 8.7, 7.83 and 1.7 percentages, respectively. However 39 percent of upland soil sample and 38 percent of paddy... |
| Tipo: PhysicalObject |
Palavras-chave: Soil survey; Soil classification; Upland rice; Highland paddy; Acid soil; Soil analysis; PH; Mae Hong Son province; การสำรวจดิน; การจำแนกดิน; ข้าวไร่; ข้าวนาที่สูง; ดินกรด; การวิเคราะห์ดิน; พื้นที่สูง; การผลิตข้าว; ความเป็นกรดด่างของดิน; ปฏิกิริยาของดิน; ผลผลิต; จ.แม่ฮ่องสอน. |
| Ano: 2014 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5711 |
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