Kandungan, Resorpsi N dan P serta Specifi c Leaf Area Daun Kakao (Theobroma cacao L.) pada Cekaman Kekeringan

Erma Prihastanti; Soekisman Tjitrosemito; Didy Sopandie; Ibnul Qayim; Christoph Leuschner

doi:10.24831/jai.v39i1.13191

Erma Prihastanti Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Diponegoro
Soekisman Tjitrosemito Departemen Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor (Bogor Agricultural University)
Didy Sopandie Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (Bogor Agricultural University)
Ibnul Qayim Departemen Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor (Bogor Agricultural University)
Christoph Leuschner Plant Ecology, Albercht von Haller Institute for Plant Sciences, University of Gottingen, Germany

DOI: https://doi.org/10.24831/jai.v39i1.13191

Keywords: drought stress, N and P resorption, specifi c leaf area, Theobroma cacao L.

Abstract

Plant nutrient absorptions depend on their environment and plants’ stage of development. Beside from soil, nutrient absorption also proceed through resorption in leaves. The resorption efficiency varies based on types of habitat. Drought stress also influences the efficiency of nutrient resorption, growth rate, and plant development. The purpose of this research was to study the change of nitrogen (N) and phosphorus (P) content and leaf resorption value of N and P, and specific leaf area of 6-years old cacao grown under drought stress. Research was carried out in a cacao plantation with 7-years old Gliricidia sepium Jacq. as shading trees. The results showed that drought stress with Troughfall Displacement Experiment (TDE) system did not affect the content and resorption level of N and P of cacao leaves. However, N resorption of cacao leaves tended to increase while P resorption decreased. Cacao plants experienced drought stress have the ability to resorp leaf N for 46.64-50.63%, leaf P for 47.98-58.40%, whereas, the control plants had the leaf N resorption of 45.05-52.97%, and leaf P resorption of 36.64-44.10%. Drought stress for 13 months on 6-years old cacao did not affect specifi c leaf area.