Impact of mineral fertilization on the growth of immature rubber trees: new insights from a field trial in Cambodia
2022
Mak, Sopheaveasna | Tiva, Lim Khan | Phearun, Phen | Gohet, Eric | Lacote, Régis | Gay, Frédéric | Cambodian Rubber Research Institute (CRRI) | Agrosystèmes Biodiversifiés (UMR ABSys) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre International de Hautes Etudes Agronomiques Méditerranéennes - Institut Agronomique Méditerranéen de Montpellier (CIHEAM-IAMM) ; Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Authors would like to warmly thank the staff of the Crop Planting and Protection division of the Cambodian Rubber Research Institute (CRRI) for supporting the research at the experimental site as well as Mr. Chhek Chan for sharing his knowledge and experience in the management of fertilization in rubber plantations.
International audience
显示更多 [+] 显示较少 [-]英语. Nutrient management is critical for the development and growth of rubber trees during the immature phase. We present the results of a fertilizer trial during the immature phase of a rubber plantation setup in Cambodia. The main objective of this study was to analyze the response of a specific clone, PB330, in the specific conditions of one of the most important rubber-growing areas of Cambodia. The experiment was arranged in a randomized complete block design with 4 treatments and 4 replications. The four treatments consisted of 3 fertilization treatments with an increasing dose of fertilizers (respectively T1, T2 and T3) compared to a non-fertilized control (T0). The girth of trees was measured every six months from the end of the first year after planting (YAP) to the end of the 6th YAP. Results showed that fertilization had a significant effect on tree girth. At the end of the 6th YAP, fertilization had a significant effect on the number of tappable trees, and stand basal area but not on average tree girth. The most pronounced effect of fertilization was observed from annual increments in girth and stand basal area during the 3rd and 4th YAP. The effect of fertilization on tree growth was evident from all three treatments, although T3 gave the most significant increase compared to T0, increasing doses of fertilizer did not significantly improve the growth parameters. Hence, this study confirmed the importance of mineral nutrition on rubber tree growth during the immature phase even at T1, the lowest level of nutrient inputs. These results can be used to improve the standard fertilizer recommendations for immature rubber trees in Cambodia. We recommend setting up similar trials in different edaphic conditions of the country with the aim to establish nutrient management practices tailored to local biophysical constraints.
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