OPTIMALISASI POLA TANAM PADI SAWAH DI DAERAH IRIGASI WAY KETIBUNG KABUPATEN LAMPUNG SELATAN

Wayan Susana, 1025011015 (2014) OPTIMALISASI POLA TANAM PADI SAWAH DI DAERAH IRIGASI WAY KETIBUNG KABUPATEN LAMPUNG SELATAN. Masters thesis, Universitas Lampung.

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Abstrak

ABSTRAK OPTIMALISASI POLA TANAM PADI SAWAH DI DAERAH IRIGASI WAY KETIBUNG KABUPATEN LAMPUNG SELATAN Oleh Wayan Susana Perubahan penggunaan lahan di Daerah Irigasi Way Ketibung dari sawah untuk tanaman padi menjadi tanaman perkebunan karet dan sawit merupakan salah satu penyebab menurunnya produksi padi di Daerah Irigasi Way Ketibung. Adanya perubahan penggunaan lahan tersebut disebabkan oleh kurang tersedianya air irigasi di sawah. Karena itu perlu dilakukan upaya untuk mengoptimalkan sawah dalam upaya meningkatkan produksi padi. Jadwal tanam yang digunakan selama ini oleh masyarakat di daerah Irigasi Way Ketibung , untuk golongan I musim tanam rendeng (MT.1) pada Bulan September minggu kesatu dan musim tanam gadu (MT.2) dimulai pada bulan Januari minggu kesatu dan untuk golongan II musim tanam rendeng yang dimulai pada Bulan September minggu kedua dan musim tanam gadu dimulai pada bulan Januari minggu kedua. Pola tanam yang dilakukan selama ini oleh masyarakat di Daerah Irigasi Way Ketibung kurang sesuai, karena hanya sedikit masyarakat yang dapat menanam padi. Hal ini disebabkan oleh karena air yang tersedia tidak maksimal untuk pola tanam tersebut. Berdasarkan observasi lapangan dan analisis data curah hujan dapat disusun pola tanam yang optimal berdasarkan hasil perhitungan neraca air dengan menggunakan pendekatan debit andalan Q80 serta kebutuhan air irigasi padi sawah di Daerah Irigasi Way Ketibung adalah untuk Golongan I, musim rendeng (MT.1) dimulai pada Bulan Desember 2, Musim Gadu (MT.2) dimulai pada Bulan April 2 . Sedangkan untuk Golongan II, masa tanam padi dimulai pada Bulan Januari 1, Gadu (MT.2) dimulai pada Bulan Mei 1. Hasil perhitungan neraca air dengan menggunakan pendekatan debit andalan Q80 maka pergiliran pola tanam yang dihasilkan sebagai berikut, Musim tanam 1: Golongan I : luas 821 Ha100% (mulai tanam Bulan Desember minggu kedua), Golongan II : luas 612 Ha 100 % (mulai tanam Bulan Januari minggu kesatu), Musim Gadu : Golongan I : luas 821 Ha 50 % (mulai tanam Bulan April minggu kedua), Golongan II :luas 612 Ha 50 % (mulai tanam Bulan Mei minggu kesatu) Kata kunci : Daerah irigasi, Way Ketibung, sawah, padi, musim tanam, neraca air, debit andalan, pola tanam ABSTRACT OPTIMIZATION OF RICE FIELD CROPPING PATTERN IN WAY KETIBUNG IRRIGATION AREA AT SOUTH LAMPUNG DISTRICT By Wayan Susana Land use changing in Way Ketibung Irrigation Area from rice field cropping to rubber and palm oil planting were one of causes to decline rice field production at its irrigation area. The changing of land use were caused by lack of water availability . Therefore, it is necessary efforts to optimize irrigation area in order to increase rice production. Based on cropping schedule which used by Way Ketibung Irrigation Area the farmer had define cropping season, rainy cropping season (rendeng, MT I) and dry cropping season (gadu, MT II). The 1st class of rainy cropping season was started on 1st week of September and on 1st week of January to the 1st class of dry cropping season. Whereas, the 2nd class of rainy season began on 2nd week of September and on 2nd week of January to the 2nd class of dry season. Cropping pattern which based on its cropping schedule that the farmers have done was not suitable, because only a few one could apply the schedule to crop rice field. It is due to the water availability could not serve the amount of water to its cropping pattern. Field observation and hydrologic analysis using suitable approach methods produced the optimized cropping pattern that approximated by reliable discharge has 80 % probability in occurs (Q80) and Net Farm Requirement (NFR). The optimized cropping pattern of Way Ketibung Irrigation Area defines the cropping season. The 1st class of rainy cropping season begins on 2nd December and 2nd April to 1st class of dry cropping season. Whereas, The 2nd class of rainy cropping season begins on 1st January and 1st May to 2st class of dry cropping season. Water balance analysis describe surplus and deficit of water, therefore could be generated cropping pattern rotation as; The rainy cropping season (MT I) : 1st class begin on 2nd week of December with 821 hectares (100 %), 2nd class begin on 1st week of January with 612 hectares (100 %). The dry cropping season (MT II) : 1st class begin on 2nd week of April with 50 % of 821 hectares, 2nd class begin on 1st week of May with 50 % of 612 hectares. Key words : Way Ketibung Irrigation Area, rice field, reliable discharge, Net Farm Requirement (NFR), water balance, cropping season, cropping pattern.

Tipe Karya Ilmiah: Tesis (Masters)
Subyek: A General Works = Karya Karya Umum
Program Studi: Fakultas Teknik > Prodi Magister Teknik Sipil
Depositing User: 336380 . Digilib
Date Deposited: 24 Oct 2014 03:34
Last Modified: 24 Oct 2014 03:36
URI: http://digilib.unila.ac.id/id/eprint/4412

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