THE CORRELATION OF PHYSIOGRAPHIC CHARACTERISTICS, PHYSICAL AND CHEMICAL CHARACTERISTICS WITH RICE PRODUCTIVITY IN RAINFED LAND AT LUMBIR SUB-DISTRICT, BANYUMAS, CENTRAL JAVA

• Main Author: Hapsari Siwi - Nim: 10611077 , Nimita
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23496
• Institution: Institut Teknologi Bandung

Rainfed rice is the second largest rice planting medium in Indonesia. This land has not been used optimally, seen from its productivity value ranging from 3 to 3.5 tons / ha. Rain-fed rice fields can be found in Lumbir, Banyumas, Central Java. In order to manage the land optimally, we need to know the constraints faced. One of them is environmental constraints. Therefore, this study aims to determine the relationship between rainfed rice productivity with physical, chemical and physiographic characteristics of the land. The research begins by making land unit map as observation area with overlay method of elevation map, land slope map and soil type map, which in each unit of land is chosen 2 point as the location of observation and sampling of soil for laboratory observation. Characteristics observed were % sand, % clay, % total porosity, bulk density, pH and% organic matter. The value of rice productivity is obtained through interview process. The relationship between productivity and physical, chemical and physiographic characteristics was tested by statistical tests. The result of overlaying of elevation map, slope map and land type map are 16 units of land. Type of soil in 16 units of land consists of 2 kinds namely (1) brown latosol and (2) complex yellow red and red podzolic latosol. Slopes of 16 units of land are divided into 0% - 2%, 5% - 15%, 15% - 40% and > 40%. The altitude of 16 units of land is divided into 6 - 131 mdpl, 131 - 251 mdpl, 251 - 376 mdpl and 376 - 496 mdpl. In the 16 units of land, the value of sand is between 55.9 - 82.1%, the value of clay is between 7.1 - 35.4%, the value of the total porosity are 99.6% and 99.7%, the value of bulk density is between 0,008 - 0,011 g/cm3, pH value is between is between 6,05 - 6,85 and value of organic matter that is between 5,1 - 8,2%. The value of rice productivity in 16 units of land is between 0.6 - 5 tons/ha. From the correlation test between the physical and chemical characteristics of the land, there was found a positive and not significant relationship between rice productivity with % sand (r = 0.317, p = 0.077), % organic matter (r = 0.79, p = 0.668) and % porosity (r = 0.221, p = 0.225). There was found a negative and not significant relationship between rice productivity with % clay (r=-0,196, p=0,282), bulk density (r = -0.256, p = 0.158), and the pH (r = -0.133, p = 0.468). From <br /> <br /> correlation test between elevation (r = -0,292, p = 0,105), slope (r = -0,372, p = 0,036) and soil type (r = 0,045, p = 0,805), it is known that among the three physiographic factors, land characteristics that have significant relationship to land productivity is slopes. The greater the slope percentage, the productivity of rice on the land will be lower. Based on the correlation value (p) it is concluded that there is no relationship between physical and chemical characteristics of the land with rice productivity and among the three physiographic characteristics tested, only slopes of land have significant relation to rice productivity, with the negative nature of the relationship.