Clones, substrates and environments for seedlings of rubber tree rootstocks

Abstract

ABSTRACT:The objective of this study was to evaluate the growth of rubber clones GT1, PR255, RRIM600 grown on different substrates and environments for the production of rubber rootstocks. The experiment was conducted at the Universidade Estadual de Mato Grosso do Sul, Cassilândia University Unit, in Cassilândia-MS. The treatments were conducted in 3 environments: (A1): Sombrite ® ; (A2) Aluminet ® and (A3) full sun, where the clones being tested were: GT1; PR 255 and RRIM 600, grown in substrates: pure soil; soil + cattle manure and commercial substrate usually used for forestry. The experimental design was a randomized block in a factorial 3 x 3 (three substrates x three clones), with 4 replicates with 10 seedlings of rubber trees per plot. The use of commercial substrate and soil + cattle manure in the ratio (7:1) favored the development of rubber rootstock seedlings with taller plants, more leave number, higher mass and higher quality index. For the formation of rootstocks, the variety RRIM600 was the one that showed better agronomic characteristics in the formation of rubber tree seedlings, with higher number of leaves, tallest plants, larger mass and higher quality index. The use of Sombrite ® and Aluminet ® screens contributed positively to the formation of rootstocks with larger root and above-ground masses. The plants produced in the Aluminet ® screen showed higher number of leaves.

Growth and biomass yield of rubber seedlings grown on soilless and soil-based media

“…The CEC was suitable for rubber seedlings. This is in agreement with the study conducted by Vieira et al (2016) where RRIM 600 rubber seedling grown in the soilless substrate with 35 cmol + /kg CEC performed better in almost all plant morphological traits than those grown in a soil-based medium. There was a significant difference among the plants grown in all the media (Table 2).…”

Multidimensional Analysis Associated With Growth Analysis in the Selection of Organic Substrates for the Production of Tomato Seedlings

“…Similarly to the results found in this study, Vieira et al (2016), working with the species Hevea brasiliensis on substrates of soil and cattle manure, were able to promote the greatest growth of seedlings. The use of manure substrate is capable of promoting the growth of high-quality seedlings, as they provide improvements in the physical conditions of the substrate, such as aeration and drainage, as well as providing nutrients (Oliveira et al, 2004;Dias et al, 2009).…”

SUBSTRATES, SEEDLING AGE AND ENVIRONMENT IN THE INITIAL GROWTH OF Cariniana pyriformis Miers

“…H. J. Lam that are classified as non-pioneer species as well as in C. pyriformis, Gaburro et al (2015) found that their tolerance to full sun versus shade conditions after 150 days could be attributed to the high plasticity of the physiological variables assessed rather than to the morphological variables (e.g., height, H/SD, DQI and leaf area). On the other hand, Vieira et al (2016) despite not finding drastic temperature and relative humidity amplitudes among two agricultural nurseries and one under full sun exposure, indicated that Hevea brasiliensis (Willd. ex A.…”

“…Thus, the production of seedlings in a protected environment could offer advantages over their production in a nursery because it allows the protection of seedlings against climatic adversities and increases the quality and precocity of these. Furthermore, also, water and fertilizer use efficiencies and cultural practices (VIEIRA et al, 2016). However, the lack of knowledge regarding the vigor of the seedlings inside these environments and use of alternative substrates is still extensive in Colombia for diverse species, including to C. pyriformis.…”