Estimation of the Area of Rubber Leaves (Hevea brasiliensis Muell. arg.) Using Two Leaflet Parameters

Abstract

SUMMARYA rapid, simple method is described for estimating the area of rubber leaves from two measurements on the middle and one of the side leaflets. The relationship between the area of a leaflet (A) and its length × breadth (LB), described by the expression A = 0.654 LB, does not vary between the three leaflets or between leaves of different ages, and clonal differences are slight.

Practical methods for non-destructive measurement of tree leaf area

“…However, comparison with A. mangium and T. grandis simple leaves show a good agreement with the H. brasiliensis leaflets studied by Lim and Narayanan (1975). Measurement of each leaflet length and leaflet width represents the maximum of accuracy in leaf area estimation (Lim and Narayanan 1975;Wiersma and Bailey 1975). But this involves additional time constraints to obtain measurements of all the lateral leaflets.…”

“…In the case of the rubber tree the authors considered the trifoliate leaf as 3 simple leaves and the measurements were done at the leaflet level in terms of lamina length and width. In their study the standard error of estimation for the area-length relationship ranged between 6.7% and 12.7% , and for the area-width relationship between 7.4% and 16.5% for different clones and leaflet positions (Lim and Narayanan 1975). Considering both length and width in their models, these authors improved the leaflet area estimation with an average error estimation of 4.3%.…”

“…Arg. (Lim and Narayanan 1975) considered all the leaflets for each single leaf. In the case of the rubber tree the authors considered the trifoliate leaf as 3 simple leaves and the measurements were done at the leaflet level in terms of lamina length and width.…”

“…In Indonesia, farmers often associate crops with different tree species such as Hevea brasiliensis (rubber tree) well known for latex production, Tectona grandis (teak) and Swietenia macrophylla (mahogany) planted for their wood quality and Acacia mangium frequently used for soil fertility improvement. Among these four species, only H. brasiliensis leaves have been studied for leaf area assessment relations by Lim and Narayanan (1975). In this kind of agroforestry system, a non-destructive method is essential as the trees are an important income for the farmers and generally cannot be felled for scientific studies.…”

Comparação entre folhas sombreadas de sete clones adultos de seringueira

“…A área foliar (AF) foi determinada para folhas completas (Lim & Narayanan, 1972), sendo mensuradas três folhas por planta. Em seguida, estas foram colocadas em estufa para secagem e posterior pesagem para se obter o peso da massa seca foliar (PMS) e calculo da área foliar específica (AFE=AF/PMS).…”