Pengaruh Periode Kekeringan Terhadap Pertumbuhan dan Hasil Beberapa Genotipe Padi

The objective of this experiment was to identify the growth and production responses of rice genotypes to drought period. Rice plants were grown under plastic house in plots separated by a massive walls and water was suplied by inlet pipe line. Drought treatments were placed as main-plot, consisted of K3, K6, K9 (water was supplied till 3, 6, and 9 weeks after rice transplanting (WAT), respectively) and control (standard rice growing without drought treatment).� Rice genotypes were placed as sub-plot, consisted of IR-64 and Ciherang (low land type improved varieties), IPB-97 (new plant type), Menthik Wangi (an aromatic local low land rice), Rokan (a hybryd rice), Way Apo Buru (amphibian type), Jatiluhur and Silugonggo (up land type). The results showed that rice growth and yield were significantly affected by drought treatment, especially in K3 and K6. Low yield in K3 and K6 were mostly caused by increased of unfilled spikelet. Jatiluhur, Ciherang and Way Apo Buru still showed relatively high yield under drought stress indicated that those genotypes were relatively tolerant to drought stress; Silugonggo and IPB-97 showed relatively medium tolerant to drought stress; IR-64, Menthik wangi and Rokan showed the most sensitive one.