Respons Pertumbuhan Vegetatif Dua Varietas Padi Gogo (Oryza sativa L.) dengan Perbedaan Taraf Kadar Air Tanah

Abstract

BRYAN DEVA SIMATUPANG: Growth Response of Two Upland Rice (Oryza sativa L.) Varieties Against Drought Stress in Vegetative Phase, supervised by by CHAIRANI HANUM. The development of upland rice is one of the strategic steps to support and increase rice production nationally. A common problem encountered to increase upland rice productivity is that the source of water depends only on rainfall. Severe and prolonged water shortage causes plants to experience drought stress. Improvements in upland rice can be done by selecting upland rice varieties that exist or can be utilized for cultivation. This research aims to study the growth response of two upland rice varieties (Oryza sativa L.) to drought stress in the vegetative phase. This research was conducted at the Greenhouse Experimental Field, Faculty of Agriculture, University of North Sumatra at an altitude of ± 32 m above sea level, from December 2023 to January 2024. This study used a factorial Randomized Group Design (RAK) method with 2 treatment factors. The first factor was variety with 2 levels, namely Sertani and Trisakti varieties. The second factor was drought stress intensity with 3 levels, namely soil moisture content of 40% field capacity, soil moisture content of 60% field capacity, soil moisture content of 80% field capacity. The results showed that the treatment of varieties had a significant effect on plant height at 2-5 weeks after planting, root volume, and leaf greenness. Drought stress intensity treatment significantly affects plant height 2-5 weeks after planting, number of leaves, plant wet weight, root wet weight, plant dry weight, root dry weight, leaf greenness, leaf thickness, cuticle, stomata, stomatal density, root length, leaf area, bullifoorm cell leaves and stem epidermis. The interaction between varieties and drought stress intensity treatment had a significant effect on plant height 2-5 weeks after planting.