Conference Paper, Seminar Nasional, Pekan Pembangunan Pertanian, Pertanian Berkelanjutan dalam Mendukung Ketahanan PanganDaerah dan Nasional, Fakultas Pertanian Universitas Ichsan Gorontalo, Gorontalo 22 – 24 Maret 2018.

Nurdin

Staf Pengajar Jurusan Agroteknologi Fakultas Pertanian Universitas Negeri GorontaloJl. Jend Sudirman No. 6 Kota Gorontalo

Abstract

Rice crops require sufficient amount of water for their development, but water is often a limitingfactor if it is grown on dry Vertisol soils. The study aimed to determine the monthly wateravailability and water available of soil profiles for paddy on Endoaquert Ustic of Paguyaman. Theresearch was conducted on 2 pedon of Vertisol soil profiles, which were pedon from SidomuktiVillage of Mootilango District of Gorontalo Regency and from Sosial Village of PaguyamanDistrict of Boalemo Regency. The soil profile was constructed and sampled according to soil surveyprinciples. Climate data were collected from the Sidodadi and Molombulahe climate stations,including: rainfall data (mm), temperature (°C), relative humidity (%) and wind speed (km hour-1).Soil data used, including: soil water content of field capacity (pF = 2.5) and permanent wilting point(pF = 4.2) and root depth on 30 cm (rice roots). Monthly water availability analysis was using waterbalance method followed by water balance of soil profiles. The results showed that monthly wateravailability of Vertisol from Sidomukti Village was higher than Vertisol from Social Village. Wateravailable of Vertisol soil profile from Sidomukti Village more by 41.09% compared to Vertisolfrom Social Village.

Keywords: Water availability, profile, soil, Vertisol

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