MANAGEMENT OF LEGUME AS LAND COVER CROP AND EMPTY BUNCH FOR THE NITROGEN EFFICIENCY IN INCEPTISOLS AT OIL-PALM PLANTATION

Supriyadi Supriyadi, Robertus Sudaryanto, Purwanto Hadisudarmo, Andries Safrudin

Abstract


The research aimed to know the kind of legume cover crop which more suitable to be cultivated especially in area of Natar, South Lampung and to know the efficiency of N supply. It used a single Completely Randomized Block Design (CRBD) consisted of 4 treatments (several kinds of debris), covering: kacang benguk (Mucuna cochinchinensis), kacang ruji (Pueraria javanica), and oil-palm empty bunch compared to one which no debris added (control). Data analyzed by regression, F test (α 5%; or Kruskal-Wallis), DMR test (α 5%; or Mood Median) and correlation test. Result showed that Pueraria javanica (kacang ruji) was more suitable to be cultivated. Regression showed that management of empty bunch tend to enhance the ratio of NH4+/N-mineral as indicator of N supply efficiency, while the management of Pueraria javanica tend to decrease the ratio of NH4+/N-mineral. The degradation of soil NO3- concentration in the treatment of empty bunch was followed by the degradation of soil nitrification potential and the enhancement of heterotrofic bacteria. The enhancement of soil nitrification potential in the Pueraria javanica and Mucuna cochinchinensis management was followed by the degradation of soil pH.

Keywords


benguk (Mucuna cochinchinensis), kacang ruji (Pueraria javanica), empty bunch, NH4+/N-mineral, NO3-, nitrification potential

Full Text:

PDF

References


Leiwakabbessy, F.M,. U. M. Wahjudin,. Suwarno. 2003. Soil Fertility. Bogor Agriculture Institute.

Mancinelli, R.L. 1992. Nitrogen Cycle. In: Encyclopedia of Microbiology. Volume 3. Leerberg J. (ed) Academic Press. Inc. 229-237.

Pahan, I. 2007. Complete Guedence of Oil Palm. Management From Begin to End. Penebar Swadaya.

Purwanto, 2007. Oil Palm Fertilizing Recommendation PT. Inti Indosawit Subur, Pangkalan Kerinci. Pelelawan, Riau. 26 pages (unpublished).

Purwanto. 2009a. Nitrification Control to Enhance the Nitrogen Fertilizing Efficiency. Innagural Speech of Professor in Soil Microbiology at Agriculture Faculty, Sebelas Maret University. Surakarta Desember 14, 2009.

Purwanto. 2009b. Soil Biology (Study of Environmental Based Soil Management). Publisher Indonesia Cerdas. Yogyakarta.

Raun, W. R and Johnson, G. V. 1999. Improving Nitrogen Use Efficiency for Cereal Production (Review & Interpretation). Agronomy Journal. 91. 357 – 363.

Rosmarkam, A dan W.N. Yuwono. 2002. Soil Fertility Science. Kanisius. Yogyakarta.

Winarso, S. 2005. Soil Fertility, Basic Healthyness and Soil Quality. Gava Media. Yogyakarta.




DOI: http://dx.doi.org/10.15608%2Fstjssa.v13i2.264

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.