Crescimento e marcha de absorção de nutrientes em mudas cítricas cultivadas em ambiente protegido no estado de Goiás.
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Data
2009-02-26
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Universidade Federal de Goiás
Resumo
The current program to produce certified citrus nursery in the state of Goiás
provides that the seedlings must be grown in protected environment for screen approves of
insect vectors and grown in containers with substrate free of pathogens. The citrus
agribusiness in Goiás has a great potential for production and there are few information on
the basis of an orchard and made the changes. Meet the march of absorption of nutrients in
citrus nursery is a prerequisite. The objective of this study was to evaluate the march of
growth and absorption of nutrients in citrus nursery grown in greenhouse in the state of
Goiás The experiment was conducted under commercial greenhouse in the municipality of
Goiânia, GO, june 2007 to may 2008. The door-graft was used lemon and clove to orange
pear scion variety. The fertigation was provided after transplanting of seedlings, three
times a week and the nutrients: N = 226, P = 150, K = 176, Ca = 190, Mg = 288, S = 128.8,
Fe = 3.0 , Zn = 30, Cu = 48 and Mn = 25 g 1000 L-1. Every 30 days, after emergence, were
assessed the following parameters: chemical characteristics of the substrate, evaluation of
biometric data, production of biomass and accumulated levels of macronutrients and
micronutrients in citrus nursery by age of the plant. The experimental design was
completely randomized, in a split-plot, with plots (root, stem, leaf and whole plant) and
subplots the stage of development (30 to 360 days after emergence) with three replications.
In determining the height and growth of seedlings, we used a ruler graduated in
centimeters, taking as reference the distance from the neck to the apex of the changes. The
diameter was measured in the neck of the plant using a digital caliper accurate to 0.01 mm.
The total biomass accumulated by the seedlings at the end of their training was
31.66 g.plant-1.The N, Ca, Mg and Cu is accumulated more in leaves. The P has had its
highest average concentration observed in the stem. The K, S, Fe, Mn and Zn are
accumulated in greater quantity in the roots. The nutrients are absorbed in greater quantity
in the following order: N > Ca > K > P> Mg > S. The micronutrients were absorbed in
greater quantity in the following order: Fe > Mn > Cu > Zn. The higher accumulation of
nutrients occurs from 150 to 180 days after emergence and 300 days after emergence. The
average levels of nutrients accumulated in orange pear on the rootstock on lemon clove
g plant-1 were: N 1.058, P 0.236, K 0.632, Ca 0.871, Mg 0.143 and S 0.105. The
cumulative average levels of micronutrients in mg plant-1 were: Cu - 0.2036, Fe - 2.1188,
Mn - 0.8694 and Zn - 0.0534. The accumulation of nutrients in parts of the plant followed
the following order: leaf > stem > root, and the accumulation of micronutrients in the
following order: root > leaf > stem.
Descrição
Citação
REZENDE, Cláudia Fabiana Alves. March of growth and absorption of nutrients in citrus nursery
grown in protected environments in the state of Goiás.. 2009. 81 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2009.