Abstract
We evaluated the effects of arbuscular mycorrhizal (AM) inoculation - Glomus mossaea, G. fasciculatum, G. etunicatum, G. macrocarpum, Gigaspora margarita, Scutellospora heterogama, Acaulospora laevis and A. muricata - on dry matter (DM) yields, and phosphorus, nitrogen, calcium, magnesium and potassium contents and uptake by Brachiaria brizantha cv. Marandu under greenhouse conditions. The AM inoculation promoted significant increments on dry matter (DM) yields and phosphorus contents and uptake. The highest DM yields were observed with the inoculation of A. muricata and S. heterogama . The more effective fungi in relation to P concentration were S. heterogama, G. etunicatum, A. muricata and G. margarita . The plants inoculated with A. muricata and G. etunicatum and S. heterogama exhibited higher phosphorus uptake. The highest percentage of root colonization occurred in plants inoculated with A. muricata e G. fasciculatum and G. margarita. The higher nitrogen contents were provided for plants inoculated with G. macrocarpum , G. etunicatum and G. mossaea . Plants inoculated with G. etunicatum recorded higher calcium and magnesium contents, while those inoculated with G. mossaea presented the highest potassium concentration. KEYWORDS: dry matter yield; macronutrients; root colonization.
Highlights
P concentration were S. heterogama, G. etunicatum, A. muricata and G. margarita
The plants inoculated with A. muricata and G. etunicatum and S. heterogama exhibited higher phosphorus uptake
The highest percentage of root colonization occurred in plants inoculated with A. muricata e G. fasciculatum and G. margarita
Summary
O solo foi coletado na camada arável (0 a 20 cm), destorroado e peneirado em malha de 6 mm, sendo a seguir esterelizado em autoclave à 110 oC, por uma hora, a vapor fluente e pressão de 1,5 atm. A semeadura foi realizada em 22 de fevereiro de 2004, utilizando-se dez sementes/vaso, desinfestadas com hipoclorito de sódio a 2% durante 20 min. O desbaste foi efetuado 15 dias após a germinação das sementes, deixando-se três plantas/vaso. Após oito semanas de cultivo, as plantas foram cortadas rente ao solo, postas para secar em estufa a 65 oC, por 72 horas, sendo, a seguir, pesadas para determinação do rendimento de massa seca (MS) e moídas em peneira de 2,0 mm. Transformados para (x + 1)0 e, então, submetidos à análise de variância e ao teste de comparação de médias de Tukey, a 5% de probabilidade, utilizandose o programa estatístico SISVAR
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