ANALISIS KEBUTUHAN AIR UNTUK TANAMAN DAN PENYIAPAN LAHAN DAERAH IRIGASI DESA MUKTI LESTARI KAB. KUTAI TIMUR

Abstract

ANALISIS KEBUTUHAN AIR UNTUK TANAMAN DAN PENYIAPAN LAHAN

DAERAH IRIGASI DESA MUKTI LESTARI KABUPATEN KUTAI TIMUR

Water Requirement Analysis for Crops and Land Cultivation in the Village Irrigation Unit

of Mukti Lestari Village, East Kutai Dustrict

Yayuk Sri Sundari

Fakultas Teknik, Universitas 17 Agustus 1945 Samarinda

Samarinda

ABSTRACT

Water requirement for paddy and secondary food crops (palawija) was mostly required for land preparation and its requirement was measured by estimating the water debit capacity and determining the proper irrigation flow dimension, both technically and water effiency. The highest evapotranspiration (ETo) occurred in August with 3.95 mm/hr and the lowest one was in june with only 2.91 mm/hr. Effective rainfall of paddy crop refered to Table 1 whereas for palawija was Table 2. Soil tillage that lasted for 35 days, requirement of water ranged 2.29-2.67 mm/hr (refer to Table 3). To gain Total irrigation efficiency (e) of 65%, water required for cropping patterm paddy-paddy palawija that planted in August is 2.67 mm/hr (NFR), 0.3090 lt/ha (DR). Whereas, the water debit planned for main channel is 0.50 lt/dt/ha, 0.40 lt/dt/ha for secondary channel,and 0.35 lt/dt/ha for tertiary channel. Furthemore, the dimension (H) for main channel was 1.00 m, subsequently 0.55 m for secondary channel and 0.45 m for tertiary channel.

Key words : Crop water requirement, Land preparation.