Growth and nutrient accumulation in three peach rootstocks until the grafting stage

Abstract

Analysing growth and nutrient accumulation is generally employed for guiding the fertilisation practices in the seedling-production chain. In the production of peach rootstock, such evaluations can provide information to aid can to aid in discrimination available genotypes, especially regarding the efficient use and conversion of fertiliser into dry matter, which can reduce the time required to obtain plants suitable for grafting. The aim of this study, was to investigate the differences in growth and nutrient accumulation in three peach-rootstock cultivars. A completely randomised experimental design was used, in a 3 x 4 factorial scheme, including three peach rootstocks ('Flordaguard', 'Capdeboscq' and 'Okinawa Roxo') and four periods of growth evaluation (20, 40, 60 and 80 days after transplanting - DAT), giving a total of 12 treatments, with four replications, one for each plant. The Flordaguard and Capdeboscq cultivars showed greater height and stem diameter as well as a greater accumulation of total dry matter at 80 DAT, and both followed the distribution: leaves (67%) > roots (33%), while total dry-matter production in 'Okinawa Roxo' was less, following the order: leaves (71%) > roots (29%). The rootstock under evaluation showed variations in growth, confirmed by the physiological indices, except for the leaf area and specific leaf area. In general, macronutrient accumulation in the shoots and roots of the cultivars during each growth period was different, suggesting intrinsic differences in each of the genetic materials regarding nutrient demand for maintaining the metabolic processes which are vital to plant growth.

Controlled-Release Fertiliser and Substrates on Seedling Growth and Quality in Agonandra brasiliensis in Roraima

“…According to Table 1, it was found that substrates 1 and 4 presented a pH value within the range considered appropriate for plant development (5.5 to 6.5) as per the classification described by Menegatti et al (2019). The remaining substrates under test presented pH values lower than those considered satisfactory.…”

Nutritional status of ‘BRS Rubimel’ peach plants in the nursery as a function of the rootstock

“…The 'BRS Rubimel'/'Flordaguard' plants generated a very different result, as shown by the values for N accumulation and total accumulated dry matter (Figure 1A), since this combination not only resulted in the highest overall mean value (i.e., 98.3 g kg -1 TDM) for N accumulation between the three rootstocks and across the three periods, but also had the lowest total dry matter per plant (Table 2). According to Menegatti, Souza, and Bianchi (2019b) and Shahkoomahally, Chaparro, Beckman, and Sarkhosh (2020), the genotypes of Prunus rootstocks, in addition to having different nutritional requirements, also accumulate nutrients in different proportions in the various plant organs (i.e., root, stem, and leaves); these are intrinsic characteristics of each genotype, and may compromise recommendations for employing rootstocks that are described as more efficient in the use of any specific nutrient, since usage efficiency does not account for the individual usage of each organ.…”

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

“…In the production of quality seedlings, it is important that the plant has a rapid growth, both in height and in the collet diameter, as the latter variable is decisive for the forest seedlings to be able to field. According to Menegatti et al (2019), it must be between 4.0 and 10 mm, at least. In this sense, the average collet diameter of Agonandra brasiliensis seedlings varied between 4.99 and 2.70 mm, with and without the addition of CRF, respectively, in the different substrates (Figure 1B).…”