Feijão guandu adubado com fosfato natural e utilizado como adubo verde para o cultivo de milho em latossolo de Cerrado
Data
2012-11-22
Autores
Farias, Lorraine do Nascimento
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Universidade Federal de Mato Grosso
Resumo
The cerrado soil has major limitations in the availability of
phosphorus to plants, requiring the management of mineral fertilizers and
green manure. Thus, the objective was to: a) evaluate the pigeonpea,
fertilized with phosphorus sources, lime and inoculated with rhizobia, as
green manure in cerrado Oxisol b) verify the relative agronomic efficiency of
reactive natural phosphate with that of triple superphosphate; c) assess the
availability of nutrients in the soil, after incubation of biomass of pigeonpea d)
to study the residual effect of pigeonpea as green manure in SPAD index and
the productive characteristics of corn grown in succession. The study was
conducted in a greenhouse in a design was completely randomized in 3x2x2
factorial with six replications. Phosphorus sources were evaluated: triple
superphosphate, reactive natural phosphate and treatment without
phosphorus, presence and absence of lime, and the presence and absence
of inoculation. The seeds of pigeonpea cv. BRS Mandarin were inoculated
with mixtures of two strains of Bradyrhizobium japonicum, and cultured for a
period of 107 days after sowing. The variables analyzed were: number of
leave, SPAD index, nodule number, dry weight of nodule, shoot and root.
The land was returned to the vessels of their respective treatments. The plant
material was ground, and 5 grams were taken samples of the dry mass of
shoot and root portion for the determination of macronutrient (N, P, K, Ca, Mg
and S). The other samples were returned to the pots and incubated for 90
days. After this period, samples were taken from 200 g of soil to
determination of macronutrient (K, Ca, Mg and S). Then, we performed the
seeding of the corn hybrid AG 1051 grown for 60 days after sowing. The
variables analyzed were: SPAD index, shoot dry mass and root. The
pigeonpea is directly influenced by phosphorus fertilization and liming in
cerrado Oxisol. The reactive rock phosphate, compared to superphosphate
has good agronomic efficiency. The availability of nutrients in the soil is
greater with pigeonpea fertilized with triple superphosphate in the presence
of lime and inoculated with rhizobia. Best match of dry matter production of16
maize shoots is obtained with triple superphosphate in the presence and
absence of lime. Best match of dry matter production of corn root is obtained
with triple superphosphate and reactive phosphate in the presence of lime.
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FARIAS, Lorraine do Nascimento. Feijão guandu adubado com fosfato natural e utilizado como adubo verde para o cultivo de milho em latossolo de Cerrado. 2012. 100 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2012.