Controlled-Release Fertilizer in the Production of Seedlings of Anonna cacans Warm

Abstract

The use of controlled-release fertilizers is a promising alternative for supplying nutrients during the initial growth of nursery seedlings. The aim of this study was to verify the effects of different doses of controlled-release fertilizer (CRF) on initial growth and nutritional status in seedlings of Anonna cacans Warm. The seeds were originally sown in a seedbed and then, after initial seedling development, were transplanted into polyethylene bags containing a substrate of washed medium sand, to which different doses of CRF had been added before transplanting. The experimental design was completely randomised, with four treatments, five doses of Osmocote® NPK 19-06-10 formulation (0, 1, 2, 4 and 8 g L -1 of substrate), with four replications, each replication comprising three seedlings (one in each container).Increases in root-collar diameter and plant height were determined throughout the experimental period (6 months) from data collected every 30 days after transplanting. At the end of the experiment the following were evaluated: height, root-collar diameter, N concentration, chlorophyll index, chlorophyll concentration (a, b and total) and leaf area. Root-collar diameter and height showed a positive linear response to increases in the fertilizer dose. From a 4 g L -1 dose of CRF, the nutrient supply added to the substrate of medium sand optimises the initial phase of plant growth and guarantees the adequate nutritional status of Anonna cacans, and can be suggested as a viable technique for use in forest nurseries, and one which results in efficient use of the input material and avoids fertilizer wastage.

Shading and slow release fertiliser affect early growth in seedlings of Pau-marfim

“…The latter probably resulted in the absorption of light energy in sufficient quantity to maintain a high rate of photosynthesis, which in turn resulted in an increase in dry matter accumulation in the shoots, as well as an increase in height (Araújo et al, 2019). Souza et al (2020), testing the growth of seedlings of Agonandra brasiliensis with and without the application of 1 g L -1 CRF (NPK 18-05-09), suggests adding this fertiliser to the sand substrate when producing seedlings, as this makes it possible to obtain more-robust plants with balanced biomass distribution and a high standard of quality. However, the results obtained with different doses of this fertiliser in the above study, show that using a dose of 2 g L -1 , and no more, 7 -8 can maximize plant growth, when taking into account the interaction of input with light level, i.e.…”

“…& Hook. F., popularly known as pau-marfim, has been the subject of recent research due to its economic potential (providing noble wood for various uses), and environmental possibilities, since it produces fruits that are attractive to fauna in general (Ramalho & Zappi, 2017, Cysneiros et al, 2018, Souza et al, 2020. Its multiple uses make it attractive, but because it is a climax species (adapted to shade) (Gualberto et al, 2014), it grows slowly and after planting, any guarantee of survival and resilience under the new conditions is directly related to the nutritional status of the seedlings (Ramalho & Zappi, 2017).…”

“…The effects of adding controlled-release fertiliser to different substrates indicated for the production of paumarfim seedlings, have already been described (Souza et al, 2020), however, there have been no studies involving the effects of shading together with the use of this nutrient source. The aim of this work, therefore, was to evaluate the initial growth of seedlings of Agonandra brasiliensis Miers ex Benth.…”

Desenvolvimento e qualidade de mudas de Parkia gigantocarpa Ducke (Fabaceae) em função de fertilizante de liberação controlada

“…Dong et al (2016) [36] utilizando um FLC, com formulação NPK (15-6-12) em plantas de Zea mays por 90 dias, verificaram aumentos significativos para o conteúdo de clorofila, PN, E e para os parâmetros de fluorescência das clorofilas quando comparadas ao tratamento controle. Smiderle et al (2020) [37] testando cinco doses de FLC em mudas de Annona cacans por um período de 180 dias encontraram aumentos nos pigmentos fotossintéticos, demostrando influência direta do fertilizante para esse parâmetro.…”

Morphological correlation and quality of Agonandra brasiliensis seedlings in substrates and controlled release fertilizer

“…Despite advances in the production of seedlings for native species in northern Brazil, there are still great gaps in knowledge about the propagation of native herbaceous species under nursery conditions (Smiderle et al, 2020), in order to produce seedlings for restoration and forest plantations (Nascimento et al, 2019).…”