PENGARUH POPULASI TANAMAN TERHADAP HASIL BEBERAPA VARIETAS UNGGUL PADI SAWAH PADA DUA MUSIM TANAM

Abstract

Testing several lowland rice varieties on different population using Integrated Crop Management (ICM) and without ICM as well was conducted in Installation of Indonesia Institute for Rice Research (IIRR) in dry season 2001 and wet season 2001/2002. Field experiment was arranged in split-split plot design with three replications. Main plots were ICM and without ICM models. Subplots were rice varieties, i.e. Ciherang, Widas and Memberamo. Sub-subplots were level of plant populations, i.e. 160,000; 250,000; 333,333 and 400,000 hill ha-1. Objectives of this experiment were to determine a variety with highest yield and good milling quality in dry and wet season as well. Results showed that rice cropping in the dry season 2001 gave higher yield than that of wet season 2001/2002. Yield in dry and wet season was 7.27 and 5.19 t ha-1 respectively, showing a decrease of 28% in wet season. Highest yield of 8,04 t ha-1 in dry season was obtained by Ciherang, followed by Widas and Memberamo with 7,19 and 6,59 t ha-1 respectively. While in wet season, yield of these varieties decreased 34, 30 and 21% respectively. Higher plant population gave also higher yield, except for rice cropping in the dry season. Plant population of 160,000 hill ha-1 or plant spacing (25×25)cm could be increased to 400,000 hill ha-1 or plant spacing legowo 2:1 (30×20×10)cm. In accordance to lower yield in wet season, quality of rice such as rice milling and broken rice decreased as well.