Fontes e doses de adubos fosfatados na cultura da soja, em solo de cerrado
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Data
1984-01-01
Autores
Fernandes, Francisco Maximino [UNESP]
Ferreira, Manoel Evaristo [UNESP]
Mello, Francisco de A.F. de
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Universidade de São Paulo (USP), Escola Superior de Agricultura
Resumo
O presente trabalho foi realizado em um LE da Fazenda Experimental da UNESP-Campus de Ilha Solteira, município de Selvíria, MS. No 1° cultivo os tratamentos foram três fontes fosfatadas (superfosfato triplo, termofosfato Mg e fosfato de Araxá) e quatro níveis (145-290-435-58O kg/ha de P2O5 total) aplicados a lanço seguido de incorporação ao solo. Houve um tratamento que não recebeu P. No 2° cultivo estudou-se o efeito residual dos adubos do 1° cultivo e de mais cinco níveis de fósforo (superfosfato triplo) em manutenção (0-36-72-108 - 144 kg/ha de P2O5), no sulco de plantio. A planta teste utilizada foi a soja 'UFV-1'. Foi observado uma resposta significativa da cultura à adubação fosfatada. Otermofosfato Mg apresentou comportamento semelhante ao superfosfato triplo no 1° cultivo, e foi superior a ele quanto aos efeitos residuais. Ofosfato de Araxá, comparado ao superfosfato triplo, apresentou eficiência superior a 80% com ou sem adubação de manutenção, possuindo, portanto, condições de ser empregado na adubação corretiva em solos de baixa fertilidade.
The present work was held in Dark-Red Latosol of the Experimental Farm of UNESP - Campus of Ilha Solteira, in Selvíria (MS). In the first crop three sources of phosphorus (triple superphosphate, Mg-thermophosphate and phosphate fro were applied in broadcast followed by incorporation into the soil, in the rates of 145-290-435-580 kg/ha of total P2O5. A control treatment with no addition of phosphorus was included. In the second crop it was studied the residual effect of the fertilizers appied to the first crop and the effect of five maintenance rates of phosphorus (0-36-72-108- 144 kg/ha of P2O5) applied as triple superphosphate in the furrow. It was observed a significant response of the crop the phosphated fertilization. The Mg-termophosphate and the triple superphosphate had similar behavior in the first crop, the former superior to this fertilizer respect to the residual effects. The phosphate from Araxá showed and efficiency of 80% as compared to the triple superphosphate either, withor without maintenance fertilization. So, the phosphate from Araxá can be recomended for corretive fertilization of soils of low fertility.
The present work was held in Dark-Red Latosol of the Experimental Farm of UNESP - Campus of Ilha Solteira, in Selvíria (MS). In the first crop three sources of phosphorus (triple superphosphate, Mg-thermophosphate and phosphate fro were applied in broadcast followed by incorporation into the soil, in the rates of 145-290-435-580 kg/ha of total P2O5. A control treatment with no addition of phosphorus was included. In the second crop it was studied the residual effect of the fertilizers appied to the first crop and the effect of five maintenance rates of phosphorus (0-36-72-108- 144 kg/ha of P2O5) applied as triple superphosphate in the furrow. It was observed a significant response of the crop the phosphated fertilization. The Mg-termophosphate and the triple superphosphate had similar behavior in the first crop, the former superior to this fertilizer respect to the residual effects. The phosphate from Araxá showed and efficiency of 80% as compared to the triple superphosphate either, withor without maintenance fertilization. So, the phosphate from Araxá can be recomended for corretive fertilization of soils of low fertility.
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Anais da Escola Superior de Agricultura Luiz de Queiroz. Universidade de São Paulo (USP), Escola Superior de Agricultura, v. 41, n. 2, p. 655-674, 1984.