EVALUASI PENINGKATAN KELEMBABAN TANAH MELALUI PEMBERIAN MULSA PELEPAH KELAPA SAWIT: PENGUJIAN TEKNIK ALTERNATIF PENGUKURAN KELEMBABAN TANAH

Hermawan, Bandi and Sukisno, Sukisno and Suhartoyo, Hery and Agustian, Indra (2017) EVALUASI PENINGKATAN KELEMBABAN TANAH MELALUI PEMBERIAN MULSA PELEPAH KELAPA SAWIT: PENGUJIAN TEKNIK ALTERNATIF PENGUKURAN KELEMBABAN TANAH. In: Seminar Nasional BKS Barat Bidang Pertanian, 20-21 July 2017, UBB-Pangkal Pinang. (Unpublished)

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Abstract

Air tanah memegang peranan penting dalam sistem produksi pertanian, sehingga diperlukan teknik konservasi agar air tersedia bagi tanaman terutama di musim kemarau. Penelitian ini bertujuan mengevaluasi peningkatan kelembaban tanah melalui pemberian mulsa pelepah kelapa sawit menggunakan dua metode penetapan kadar air tanah: pengukuran langsung dan pendugaan. Sepuluh titik pengukuran dipilih di lahan kelapa sawit, sebagian permukaan tanah tertutup mulsa pelepah kelapa sawit selama 10 tahun dan sebagian lagi dibiarkan terbuka. Kelembaban tanah mula-mula ditetapkan menggunakan alat pengukur impedensi listrik tanah lalu dikonversi ke dalam nilai kadar air tanah. Selanjutnya contoh tanah diambil dari lokasi pengukuran impedensilistrik, dimasukkan ke dalam kantong plastik dan dibawa ke laboratorium untuk pengukuran kadar air tanah secara gravimetri. Pengukuran impedensi dan kadar air tanah gravimetri dilakukan pada kedalaman 0-10 dan 10-20 cm. Hasil penelitian menujukkan bahwa tanah yang tertutup mulsa secara konsisten di 10 titik pengamatan lebih tinggi dibandingkan yang terbuka, baik berdasarkan pengukuran gravimetri maupun pendugaan dari impedensi listrik. Selisih kadar air tanah antara dua perlakuan mulsa mencapai 30 persen pada lapisan atas dan dibawah 25 persen pada lapisan bawah. Hasil penelitian juga menunjukkan bahwa teknik baru penetapan kelembaban tanah melalui pengukuran impedensi listrik dapat digunakan untuk mengevaluasi dinamika kelembaban tanah di lapangan. Kata-kata kunci: air tanah, gravimetri, impedensi listrik, mulsa. Soil water plays an important role in agriculture, therefore required a conservation technique for its availability to the plant especially in the dry season. This study aimed to evaluate the improvement of soil wetness under the midrib mulch of palm oil using two different, direct and indirectmethods of soil wetness determination. Ten points of measurements were selected in the palm oil site, measurements were conducted in the 0-10 and 10-20 depths of bare and mulch-covered soils. Soil wetness were predicted from the measurements of the electrical impedance, soil samples were taken for the laboratory determination of gravimetric water content. Results showed that mulching consistently improved soil wetness in all ten points of measurements compared to the bare soil when using both the direct and indirect techniques of soil water determination. Differences in soil wetness between two mulching treatments were up to 30 percent for toposoil and less than 25 percent for subsoil. Results also indicated that the new technique of soil wetness prediction could be useful for the evaluation of soil dynamics in the agricultural land.Keywords: electrical impedance, gravimetry, mulch, soil wetness.

Item Type: Conference or Workshop Item (Paper)
Subjects: S Agriculture > S Agriculture (General)
Divisions: Faculty of Agriculture > Department of Soil Science
Depositing User: Mr. Bandi Hermawan
Date Deposited: 02 Jun 2020 09:52
Last Modified: 02 Jun 2020 09:52
URI: http://repository.unib.ac.id/id/eprint/21186

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