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Management Allowable Depletion (MAD) Level for Water Use Efficiency of Chili on Typic Kanhapludults at Tamanbogo, Lampung HARYATI, UMI; SINUKABAN, N; MURTILAKSONO, K; ABDURACHMAN, ADI
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 31 (2010): Juli 2010
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.752 KB) | DOI: 10.2017/jti.v0i31.211

Abstract

Water scarcity is the main factor causing crop production decrease and harvest failure in the upland areas. To improve water use efficiency by plants, Management Allowable Depletion (MAD) concept can be applied. MAD is the degree of soil dryness that still lead to optimum crop yied. This research was aimed to: 1) determine a correct MAD-level in order to achieve the optimum water use efficiency and 2) evaluate the effect of irrigation water sources on water use efficiency. The research was carried out on a Typic Kanhapludults at Tamanbogo Experimental station, East Lampung in dry season of 2005. Chili (Capsicum annum) was use as an indicator crop. The size of experimental plot was 5 x 10 m, that was arranged in split-plot design with 3 replications. The treatments were irrigation water sources designed as main plot which consisted of: A1 = ground water A2 = surface water, while MAD-level was designed as sub-plot, which consisted of : I1 = 20% of available water, I2 = 40% of available water, I3 = 60% of available water, I4 = 80% of available water, and I5 = 100% of available water. Irrigation was provided to reach 80, 60, 40, and 20% available water respectively. For the I5 treatment, irrigation was applied every day. The results showed that MAD-level of 60% of available water (I3) with the average of 9.6 mm of irrigation water, applied every three days, gave themost optimum crop yield and water use, thus achieving the highest water use efficiency. The surface irrigation water had a better quality than ground water,leading to a better plant growth, a higher crop yield and a higher water use efficiency than ground water
PEMODELAN PENETAPAN LAHAN SAWAH BERKELANJUTAN BERBASIS REGRESI LOGISTIK DAN EVALUASI LAHAN MULTIKRITERIA DI KABUPATEN SUKABUMI Santosa, Sigit; Rustiadi, Ernan; Mulyanto, Budi; Murtilaksono, K; Widiatmaka, Widiatmaka; Rachman, Noer F
MAJALAH ILMIAH GLOBE Vol 16, No 2 (2014)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (907.783 KB) | DOI: 10.24895/MIG.2014.16-2.65

Abstract

ABSTRAKAlih fungsi sawah terus terjadi di Pulau Jawa sehingga mengancam ketahanan pangan nasional. Rencana Tata Ruang Wilayah (RTRW) dan kebijakan Lahan Pertanian Pangan Berkelanjutan (LP2B) belum mampu mengendalikan alih fungsi sawah. Penelitian ini bertujuan untuk membangun model penetapan lahan sawah berkelanjutan menggunakan metode regresi logistik dan evaluasi lahan multikriteria. Penelitian dilaksanakan di Kabupaten Sukabumi yang merupakan wilayah perbukitan di bagian selatan Pulau Jawa dengan luas lahan sawah yang cukup besar dan mendukung ketersediaan pangan nasional. Pemodelan dibangun berdasarkan karakteristik alih fungsi lokal dengan mempertimbangkan konsep pembangunan berkelanjutan. Variabel-variabel penting yang mendukung terjadinya alih fungsi sawah yang dipertimbangkan adalah jarak sawah terhadap jalan, permukiman, dan industri. Hasil regresi logistik selanjutnya menjadi masukan bobot bagi evaluasi lahan multikriteria yang dapat menghasilkan tiga skenario kebijakan perlindungan sawah, yaitu standar, protektif, dan permisif guna kepentingan pembangunan. Melalui pemodelan ini diperoleh sawah-sawah prioritas lindung yang memudahkan pengelolaannya dan sekaligus menjadi penyangga bagi sawah-sawah di belakangnya.Kata Kunci: model perlindungan lahan sawah berkelanjutan, regresi logistik, evaluasi lahan multikriteriaABSTRACTConversion of paddy fields has continuously occurred in Java Islands, thus threatens a national food security. The Regional Spatial Planning and the Policy on Sustainable Food-crop Agricultural programs seem to unable to control paddy field conversion. This research was conducted to develop a sustainable paddy field zone delineation model using logistic regression and multicriteria land evaluation. The research location is in the Sukabumi Regency which is has various morphology and large paddy fields to support national food security. The model is developed by local conversion characteristics and considering the concept of sustainable development. Important variables that contribute to paddy fields conversion are the distance to road, settlements and industrial regions. Results of logistic regression then become the input for weighted criteria to develop three policy scenarios of paddy fields protection; standard, protective, and permissive in order to support regional development. Through this model, we obtain the priority paddy fields to be protected as well as become buffer zones for the surrounding paddy fields.Keywords: paddy fields protection model, logistic regression, multicriteria land evaluation