2005
DOI: 10.2134/agronj2004.0241
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Response of No‐Till Soybean [Glycine max (L.) Merr.] to Timing of Preplant and Foliar Potassium Applications in a Claypan Soil

Abstract: Potassium availability in agronomic crops has recently decreased due to periodic drought conditions, soil compaction, reduced K applications, lower frequency of soil testing, and higher K fertilizer requirements because of increasing corn (Zea mays L.) yields and larger soybean [Glycine max (L.) Merr] acreage. Little research has evaluated the effects of foliar K applications on low to medium soil test K claypan soils, which are susceptible to drought and surface compaction. Field research was conducted in 200… Show more

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Cited by 34 publications
(47 citation statements)
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“…The reduction in the number of pods plant -1 for the cultivar M9144RR in the treatments with severe and moderate water deficit along the entire cycle and in the reproductive stage, T1, T2, T6 and T7, respectively, may be related to the abortion of flowers, because, according to Nelson et al (2004), the highest water demand by soybean occurs during the period of flowering/grain filling. Therefore, the occurrence of water deficit in this period cause physiological alteration in the plants and lead to a premature fall of leaves, flowers and abortion of pods, while in T4, even with full irrigation in the remaining stages, it was not sufficient to recover the effects of the water deficit imposed on plants during the vegetative stage for this variable.…”
Section: Resultsmentioning
confidence: 99%
“…The reduction in the number of pods plant -1 for the cultivar M9144RR in the treatments with severe and moderate water deficit along the entire cycle and in the reproductive stage, T1, T2, T6 and T7, respectively, may be related to the abortion of flowers, because, according to Nelson et al (2004), the highest water demand by soybean occurs during the period of flowering/grain filling. Therefore, the occurrence of water deficit in this period cause physiological alteration in the plants and lead to a premature fall of leaves, flowers and abortion of pods, while in T4, even with full irrigation in the remaining stages, it was not sufficient to recover the effects of the water deficit imposed on plants during the vegetative stage for this variable.…”
Section: Resultsmentioning
confidence: 99%
“…Esses resultados diferem dos obtidos por Lana et al (2002) para altura e fitomassa seca de plantas de e com 5 m de comprimento, totalizando 25,00 m 2 , sendo a área útil para as avaliações de 12,00 m 2 . Para a aplicação dos tratamentos, foram realizadas distribuições manuais a lanço.…”
Section: Resultsunclassified
“…Para ambos os parâmetros, houve comportamento semelhante, em que as equações de regressão se ajustaram ao modelo quadrático das curvas; todavia, apenas os parâmetros da equação de altura de plantas foram significativos. Os dados evidenciam maior altura de plantas na dose de 90 kg ha -1 de K 2 O. Esses resultados estão de acordo com os verificados por Lana et al (2002), em que a aplicação de 90 kg ha -1 de K 2 O proporcionou maior altura de plantas de soja.…”
Section: éPocaunclassified
“…Entre as várias funções do K na planta, a regulação da turgidez dos tecidos, abertura e fechamento dos estômatos e controle da transpiração são fundamentais para aumentar a eficiência de uso da água pelo vegetal. Plantas bem supridas de K são mais eficientes no uso que as deficientes, sendo que a quantidade de água para produzir uma unidade de massa seca, dentro de limites, é tanto menor quanto maior o suprimento de K (NELSON, 2005).…”
Section: Introductionunclassified
“…O acúmulo de K nas raízes das plantas produz um gradiente de pressão osmótico que atrai a água em direção as raízes. As plantas deficientes em K são menos capazes de absorver água e estão mais sujeitas ao estresse quando o teor de água está abaixo do crítico para cultura (NELSON, 2005). Da mesma maneira, o aumento da umidade do solo favorece a difusão do K, aumentando a disponibilidade deste elemento para as plantas (OLIVEIRA et al, 2004).…”
Section: Introductionunclassified