Resumo

DUSSAN C., SINDY LORENA; VILLEGAS H., DANIEL ANDRÉS  e  MIRANDA L., DIEGO. Growth analysis of guava (Psidium guajava L.) trees var. ICA Palmira II with N, P, K, Mg, Ca and B deficiencies in the nursery phase. rev.colomb.cienc.hortic. [online]. 2015, vol.9, n.2, pp.209-221. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2015v9i2.4186.

The guava is a fruit species of the Myrtaceae familiy; it stands out as a fruit with a high vitamin conten. It is a crop with little research and technical assistance, especially in the area of fertilization, but has enormous potential for expansion in terms of modernization and profitability. Three(month( old guava trees of the ICA Palmira II variety were used, transplanted into plastic bags and kept for 128 days in a plastic greenhouse. Nutritional deficiency was induced with the missing element technique under a nutrient solution, using a completely randomized experiment design with 152 sampling units and 8 treatments with 3 repetitions: T0: application of water without the addition of mineral elements; T1: complete fertilization (absolute control); T2: -N; T3: -P; T4: -K; T5: -Mg; T4: -Ca and T7: -B. The relative growth rate (RGR), leaf area index (LAI), specific leaf area (SLA), leaf area ratio (RAF) and net assimilation rate (NAR) were determined9 It was found that the omission of nitrogen, as compared to complete fertilization, was the most limiting treatment in the early stages of seedling development of the guava. In contrast, in the -B treatment, the growth and development of the plants were not limited, as this treatment did not inhibit the emission of new tissue or dry matter accumulation. The lack of K, P, Mg and Ca presented no negative effect on the growth and development of the guava trees; however, the plants subjected to these treatments showed typical symptoms of deficiency in plants of agronomic interest.

Palavras-chave : nutrient; indices; fertilization; missing element.

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