Potential of rice crop fertilized with compost of Chromolaena odorata to produce grain yield and forage sources supporting food security

Abstract

Jamilah, Junarti, Mulyani S. 2016. Potential of rice crop fertilized with compost of Chromolaena odorata; to produce grain yield and forage sources supporting food security. Pros Sem Nas Masy Biodiv Indon 2: 22-26. The research had been done on two locations in Bayang, South Pesisir District wetland and Koto Tangah Subdistrict, Padang in February to July 2015. The research was arranged in a Split Plot Design (SPD) and randomly blocked design. The main plot was arranged based on the height of trimmed, consisted of 3 treatments, i.e. (i) P0 = not trimmed, (ii) P1 = trimmed on 5 cm in height above on the ground (aog) and (iii) P2 = trimmed on 15 cm in height (aog). The subplots were a treatment of composting of C. odorata and artificial fertilizer, consisted of three fertilizers composition that were: (i) F1 = 5 Mg ha-1 compost of C. odorata + 100% recommendation artificial fertilizer rate (RAFR), (ii) F2 = 7.5 Mg ha-1 compost of C. odorata + 75% RAFR and (iii) F3 = 10 Mg ha-1 compost of C. odorata + 50% RAFR, blocked into three, therefore there were 27 treatment plots. Data were analyzed statistically by using Analysis of Variance (ANOVA) at 95% confidence level. The parameter of observations included forage, productive tillers, date to flowering, C/N ratio, crude protein component, panicle length and weight of dry grain harvest. The results showed that more weight of forage was obtained from the trimmed treatment at the beginning of early primordial at 15 cm aog reached 7.17 Mg ha-1 than others. More weight of dry milled grain on plants that were not trimmed reached 6.22 Mg ha-1 than others. Generally, the composting of 5 Mg ha-1 C. odorata + 100% RAFR was the most appropriate fertilizer composition to produce the rice grain and forage optimally.