Articles
INFLUENCE OF ROOT ZONE RESTRICTION ON THE GROWTH OF FOUR PAPAYA (CARICA PAPAYA L.) GENOTYPES
Article number
516_18
Pages
155 – 162
Language
Abstract
The variation in production among genotypes may be influenced by plant morphological characteristics or by edaphic and climatic factors.
In this study, four papaya genotypes, two from ‘Solo’ group (Sunrise Solo and Improved Sunrise Solo line 72/12) and two from "Formosa" group (Tainung 02 and Know-You 01) grown in yellow podzol at two distinct effective deepness (ED) were analyzed.
The ED was determined using a penetrograph in a soil with average humidity of 17,2%. The area with ED of 34.5 cm that received a maximum force of 4.12 MPa for penetration was delimited as an area with restriction (WR) to root growth, while, the area with minimum ED of 60.0 cm that received a force lower than 2.30 MPa for penetration as an area with no restriction (NR). Total leaf number (TLN), average leaf area (ALA), length of leaf central vein (LLCV), total leaf area (TLA), trunk diameter (TD), tree height (TH) and specific leaf weight (SLW) were determined under field condition in four plants per genotype, in both ED, five months after transplant of seedlings.
A mathematical model (Log LA = 0,315 + 1,85 Log LCV, R2=0,898) was adjusted to estimate the leaf area (LA) using the length of LCV for the four genotypes.
The WR plants showed significantly lower values of TLN, ALA, LLCV, TLA, TD and TH compared to NR plants.
The SLW was significantly low only in the Tainung 02 which growth was the most affected by the root zone restriction among the four genotypes.
In this study, four papaya genotypes, two from ‘Solo’ group (Sunrise Solo and Improved Sunrise Solo line 72/12) and two from "Formosa" group (Tainung 02 and Know-You 01) grown in yellow podzol at two distinct effective deepness (ED) were analyzed.
The ED was determined using a penetrograph in a soil with average humidity of 17,2%. The area with ED of 34.5 cm that received a maximum force of 4.12 MPa for penetration was delimited as an area with restriction (WR) to root growth, while, the area with minimum ED of 60.0 cm that received a force lower than 2.30 MPa for penetration as an area with no restriction (NR). Total leaf number (TLN), average leaf area (ALA), length of leaf central vein (LLCV), total leaf area (TLA), trunk diameter (TD), tree height (TH) and specific leaf weight (SLW) were determined under field condition in four plants per genotype, in both ED, five months after transplant of seedlings.
A mathematical model (Log LA = 0,315 + 1,85 Log LCV, R2=0,898) was adjusted to estimate the leaf area (LA) using the length of LCV for the four genotypes.
The WR plants showed significantly lower values of TLN, ALA, LLCV, TLA, TD and TH compared to NR plants.
The SLW was significantly low only in the Tainung 02 which growth was the most affected by the root zone restriction among the four genotypes.
Authors
O.K. Yamanishi, E. Campostrini, S.L.D. Marin, L.A.P. Martelleto
Keywords
genotypes, growth, leaf area, papaya, root restriction
Online Articles (20)