Peningkatan Hasil Padi Gogo Melalui Pengaturan Waktu Tanam dan Aplikasi Biochar Sekam Padi pada Zone Agroklimat D1 Oldeman

Abstract

This research was conducted in the greenhouse of Agriculture Faculty, University Methodist Medan from August to September 2012. The objective of this study was to determine differences of upland rice varieties tolerant level to drought through root bioassay in several level of water application. Selections was made based on the root length relative value by comparing root length in normal conditions (80% moisture content level of field capacity) with root length in drought stress (20% moisture content level of field capacity). Twelve upland rice varieties used in this study, consists of one local varieties namely Si Lumut and 11 varieties derived from Indonesia Center for Rice Research Sukamandi namely Batutegi, Limboto, Situpatenggang, Situbagendit, Towuti, Cirata, Danau Gaung, Gajah Mungkur, Inpago 4, Inpago 5, Inpago 6. Upland rice varieties were treated drought stress on 4 levels of soil moisture were K1 = 20% of field capacity (FC) ; K2 = 40% FC; K3 = 60% FC; K4 = 80% FC. The results showed that all varieties of upland rice has root length relative value higher than 50% that means the varieties were tolerant to drought. Five varieties that haved the highest root length relative value respectively, were Inpago 4, Situbagendit, Situpatenggang, Limboto, and Batutegi.

Penelitian ini dilaksanakan di rumah kaca Fakultas Pertanian Universitas Methodist Medan dari bulan Agustus sampai September 2012. Penelitian ini bertujuan untuk menemukan perbedaan tingkat toleransi varietas padi gogo terhadap kekeringan melalui uji hayati akar pada beberapa tingkat kadar air. Seleksi dilakukan berdasarkan nilai relatif panjang akar yang membandingkan panjang akar pada kondisi normal (tingkat kadar air 80 % kapasitas lapang) dengan kondisi cekaman kekeringan (tingkat kadar air 20 % kapasitas lapang). Varietas padi gogo digunakan terdiri dari 1 varietas lokal yaitu Si Lumut dan 11 varietas yang berasal dari BB Padi Sukamandi yaitu Batutegi, Limboto, Situpatenggang, Situbagendit, Towuti, Cirata, Danau Gaung, Gajah Mungkur, Inpago 4, Inpago 5, Inpago 6. Dua belas varietas padi gogo diberi pelakuan air pada beberapa tingkat kadar air yaitu K1 = 20 % kapasitas lapang (KL); K2 = 40 % KL; K3 = 60 % KL; K4 = 80 % KL. Hasil penelitian menunjukkan bahwa seluruh varietas padi gogo memiliki nilai relatif panjang akar lebih besar dari 50 % sehingga tergolong pada varietas yang toleran terhadap kekeringan. Lima varietas yang memiliki nilai panjang relatif akar tertinggi berturut-turut yaitu varietas Inpago 4, Situbagendit, Situpatenggang, Limboto, dan Batutegi.