2006
DOI: 10.1590/s0103-90162006000400008 View full text |Buy / Rent full text
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Abstract: Effects of lime and gypsum applications on the quality of soybeans grown under no-till (NT) are not well defined yet. A field trial established in 1998 on a dystrophic clayey Rhodic Hapludox, at Ponta Grossa, State of Paraná, Brazil, evaluated grain yield and soybean quality based on oil, protein and nutrient content, after lime and gypsum applications under NT, in a randomized complete block design (n = 3), split-plot experiment. In the main plots, the treatments with dolomitic lime were: control (no lime), s… Show more

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“…Increases in Ca and S concentrations in corn leaves and in P and S concentrations in soybean leaves due to gypsum application under NT systems have been obtained in others studies (Caires et al, 1999(Caires et al, , 2003(Caires et al, , 2004. As has been shown previously (Sumner et al, 1986;Caires et al, 2003Caires et al, , 2006, the P contained in the gypsum composition as an impurity is important for plant nutrition when high rates of gypsum are applied.…”
Section: Resultsmentioning
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“…Increases in Ca and S concentrations in corn leaves and in P and S concentrations in soybean leaves due to gypsum application under NT systems have been obtained in others studies (Caires et al, 1999(Caires et al, , 2003(Caires et al, , 2004. As has been shown previously (Sumner et al, 1986;Caires et al, 2003Caires et al, , 2006, the P contained in the gypsum composition as an impurity is important for plant nutrition when high rates of gypsum are applied.…”
Section: Resultsmentioning
“…In our study, the soil had no exchangeable Al and had elevated levels of exchangeable Ca in the subsoil (0.0 -0.6 m), making it unlikely that a yield increase in response to gypsum application was caused by amelioration of subsoil acidity. No response of soybean yield to gypsum (Quaggio et al, 1993;Oliveira and Pavan, 1996;Caires et al, 2003Caires et al, , 2006 has been attributed to the lower Al toxicity to the root growth in NT systems during cropping seasons that have adequate and well-distributed rainfall (Caires et al, 2001(Caires et al, , 2008. This reasoning does not apply in this study because the soil did not present chemical limitations for root growth (Table 1).…”
Section: Resultsmentioning
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“…A aplicação de gesso não resultou em aumento da produtividade de grãos de soja em vários estudos (Caires et al 1999, 2003e 2006, Nogueira & Melo 2003, Maschietto 2009). De acordo com Nogueira & Melo (2003), a ausência de resposta da soja à aplicação de gesso está relacionada à quantidade de S proveniente da mineralização da matéria orgânica suficiente para suprir as necessidades da cultura.…”
Section: Key-wordsunclassified
“…Segundo Nuernberg et al (2005), quando o gesso é aplicado ao solo, a maior resposta sob condições de deficiência hídrica está no maior crescimento radicular. Alguns estudos destacam que, sob condições de distribuição regular de chuvas, não há resposta à aplicação de gesso (Caires et al 1999, 2003e 2006, Maschietto 2009). Além disso, Caires et al (2008) de milho e de soja, com resposta até a dose de 2 t ha -1 , com incrementos de 9,3 %, para o milho, e de 11,4 % e 11,3 %, respectivamente com e sem calcário, para a soja.…”
Section: +unclassified