Crescimento e marcha de absorção de nutrientes em mudas cítricas cultivadas em ambiente protegido no estado de Goiás.

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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.

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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.