PERUBAHAN KONDUKTIVITAS HIDRAULIK DAN DAYA HANTAR LISTRIK TANAH AKIBAT PEMBERIAN UREA DAN BAHAN ORGANIK PADA TANAH ULTISOL

Ida Suryani

Abstract


Penelitian bertujuan untuk mengetahui pengaruh urea yang diberikan bersama dengan bahan organik bernisbah C/N tinggi (50-70) atau C/N rendah (10-20) terhadap konduktivitas hidraulik dan daya hantar listrik pada tanah Ultisol. Penelitian disusun dalam Rancangan Petak Terpisah. Petak utama adalah bahan organik, yaitu tanpa  bahan organik, daun calopogonium, dan jerami padi  1,275 x 10-8  kg/ha, setara dengan 15,3 g/pipa. Anak petak adalah dosis urea yang terdiri atas 0, 100, dan 300 kg/ha masing-masing setara dengan 0 g/pipa, 0,0425 g/pipa dan 0,0825 g/pipa, yang diaplikasi pada tanah Ultisol. Contoh tanah Ultisol diambil pada kedalaman 0 -120 m yang dikeringudarakan, lalu diayak, dicampur dengan TSP, bahan organik, dan urea sesuai perlakuan, dimasukkan dalam tabung (pipa) PVC yang bagian dasarnya ditutup dengan kain kasa halus untuk menahan tanah namun tetap memungkinkan perkolasi. Inkubasi dilakukan selama 2 minggu . Pengamatan dilakukan setelah masa inkubasi selesai , meliputi konduktivitas hidraulik dan daya hantar listrik. Pemberian  bahan organik dan urea dosis 300 kg/ha  dapat menaikkan daya hantar listrik tanah. Pemberian bahan organik utamanya yang bernisbah C/N tinggi (jerami padi) meningkakan konduktivitas hidraulik. Daya hantar listrik atau electrical conductivity (EC) merupakan indikator yang baik dalam menjelaskan pengaruh dispersif urea maupun pengaruh flokulasi bahan organik. Daya hantar listrik yang tinggi selalu menghasilkan konduktivitas hidraulik yang tinggi pada tanah Ultisol.

 

ABSTRACT

 

This study aimed to determine the effect of urea added with organic matter in a high C/N (50-70) or low C/N (10-20) ratio on the hydraulic conductivity and electrical conductivity of Ultisol soil. The research was arranged in a Split Plot Design. The main plot is organic matter, ie, without organic matter, calopogonium leaves, and rice straw 1,275 x 10-8 kg/ha, equivalent to 15.3 g/pipe. Sub-plots were urea doses consisting of 0, 100, and 300 kg/ha, equivalent to 0 g/pipe, 0.0425 g/pipe, and 0.0825 g/pipe, respectively, applied to Ultisol soil. Sample of Ultisol soil were taken at a depth of 0 -120 m which were air-dried, then sifted, mixed with TSP, organic matter, and urea according to treatment. The sample put in a PVC tube (pipe) with the bottom covered with fine gauze to hold the soil but still allow percolation. . Incubation was carried out for two weeks. Observations were made after the incubation period, including hydraulic conductivity and electrical conductivity. The application of organic matter and urea at a dose of 300 kg/ha can increase the electrical conductivity of the soil. Adding the main organic matter with a high C/N ratio (rice straw) increases the hydraulic conductivity. Electrical conductivity (EC) is a good indicator in explaining the dispersive effect of urea and the effect of flocculation of organic matter. High electrical conductivity always results in high hydraulic conductivity in Ultisol soils.


Keywords


Kata kunci : Urea; bahan organik, konduktivitas hidraulik; daya hantar listrik; Ultisol

References


Balbino, L. C., Bruand, A., Brossard, M., Grimaldi, M., Hajnos, M. And Guimar~aes, M. F. (2002). Changes in porosity and microaggregation in clayey Ferralsols of the Brailian Cerrado on clearing for pasture. Eur. J. Soil Sci. 53: 219-230.

Bravo-Garza, M.R., Bryan, R.B., (2005). Soil properties along cultivation and fallow

time sequences on Vertisols in Northeastern Mexico. Soil Science Society of America Journal 69: 473– 481.

Cass, A. S.Gusli, and D.A.MacLeod (1994). Sustainability of Soil structure quality in ricew pady- soya-bean cropping systems in South Sulawesi- Indonesia. Soil and Tillage Research 31: 339 – 352.

Chun, H. C., Gim¶enez, D. and Yoon, S. W. (2008). Morphology, lacunarity andentropy of intra-aggregate pores: Aggregate size and soil management effects. Geoderma. 146: 83-93.

Emerson, W.W. (1959). The structure of soil crumbs. Journal of Soil Science 10: 235-244

Hainun, (1997). Dispersibilitas beberapa tanah tropika akibat pemberian urea (skripsi). Jurusan Imu Tanah, fakultas Pertanian.

Hanafiah, K, A., (2007). Dasar-dasar Ilmu Tanah. Rajawali Pers. Jakarta.

Iranpour, M., A. Lakzianand R. Korrasami. (2014). Effect of cadmium and organic matter on soil pH, electrical conductivity and their roles in cadmium availibility in soil. JMEAST, 18:643-646.

Kutilek, M., Jendele, L. And Panayiotopoulos, K. P. (2006). The influence of uniaxial compression upon pore size distribution in bi-modal soils. Soil Till. Res. 86: 27-37.

Jun,W, S. Hui-zhein and Z. Dao-ming (1985). Electrical Conductuvity. In: Y. Tianren (ed). Physical Chemistry of paddy Soils. Springer-Verlag. New York 157 -163.

Mohr, E.C.J., F.A. Van baren and J. Van Schuylenborgh (1972). Tropical Soils. The Haque, Paris.

Munir, S (1996). Tanah –tanah Utama Indonesia. Karakteristik, Klassifikasi dan pemanaafannya. Pustaka Jaya, Malang.

Nayak, P., D. Patel, B. Ramakrishnan, A.K. Mishraand R.N. Samantaray. (2009). Long-term aplication effects of chemical fertilizer and compost on soil organic carbon under intensive rice-rice cultivation. Nutr.Cycl. Agroecosyst., 83:259-269.

Pampolino, M.F., E.V. Laureles, H.C. Ginesand R.J. Buresh. (2008). Soil carbon and nitrogen changes in long-term continuous lowland rice cropping. Soil Sci. Soc. Am. J., 2: 798-807.

Samosir, S. S. R (1994). Kimia Tanah. Jurusan Ilmu Tanah, Fakultas Pertanian dan Kehutanan Universitas Hasanuddin, Ujung Pandang.

Soil Survey Staff. Soil Taxonomy (1975). A basic System For making and Interpreting Soil Survey. Dept. Agr. Hand Book no.436.

Suryani, I. (2014). Permiabilitas berbagai kedalaman tanah pada areal konversi lahan hutan. Agrisistem Seri Hayati Vol.2. ISSN No. 1858-4330

Wairiu, M. and Lal, R. (2006). Tillage and land use effects on soil microporosity in Ohio, USA and Kolombangara, Solomon Islands. Soil Till. Res. 88: 8084.




DOI: http://dx.doi.org/10.31850/jgt.v10i3.805

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