Purpose The purpose of this paper is to examine the effect of the application of microorganisms of phosphate providers and organic matters for the growth of Arabica coffee seedlings in Bener Meriah Regency. Design/methodology/approach The experiments were performed inside the screen house using a random design of factorial group with six repetitions. The experimental treatments consisted of two factors. Factor I is the application of microorganisms of phosphate providers. Factor II is the application of organic matters (T. diversifolia and the coffee bean skins). The parameters observed were as follows: enhancement of plant height was observed every 30 days for 270 days, and a number of primary branch and dry weight of roots were observed 270 days after planting (DAP). The data obtained were analyzed by analyzing the variance at 5 per cent level; if the treatment had an effect, then the treatment was continued to Duncan’s multiple range test at 5 per cent. Findings The application of microorganisms of phosphate provider increases the height improvement, the number of primary branches and the dry weight of roots of Arabica coffee seedlings. The application of Listeria sp. microorganisms of phosphate provider gives the highest yield on the height increase, the number of primary branches and the dry weight of roots of Arabica coffee seedlings. The application of organic matters of coffee beans skin gives higher yield than Tithonia diversifolia in height and dry weight of roots of Arabica coffee seedlings. The interaction between the application of microorganisms of phosphate provider and organic matters increases the dry weight of roots of Arabica coffee seedlings. The interaction of Listeria sp.-skin of coffee beans gives the highest yield on dry weight of roots of Arabica coffee seedlings. Originality/value Several other studies have demonstrated that the application of microorganisms of phosphate providers using phosphate solubilizing bacteria (Fitriatin et al., 2014; Sembiring et al., 2017) and mycorrhizal use (Hart and Trevors, 2005; Rouphael et al., 2015) increased the growth and yield plant. No previous study comprehensively studied the application of microorganisms of phosphate providers and organic matters to improve the growth of Arabica coffee seedlings in Andisol in Bener Meriah Regency.
Soil organic matter is an indicator of soil fertility. The purpose of this study was to analyse various forms of soil organic carbon in citronella plantation, citronella plantation under pine tree, and soil under pine tree. Soil organic carbon in various forms was analysed from soil samples taken from each horizon and soil profile. The soil profiles observed were ultisol profiles planted with citronella, citronella under pine tree, and under pine tree, and slopes; 0-8%, 8-15%, 15 -25%, and 25-40%, in order to obtain 12 soil profiles with a total of 39 soil samples. Ultisols planted with citronella had higher soil organic carbon than ultisols planted with citronella under pine tree and ultisols under pine trees. Based on the slope, the highest soil organic carbon was obtained in the soil with a slope of 0-8%, and decreased with increasing slope. Based on soil depth, the highest soil organic carbon was obtained in the upper horizon, compared to the horizon below. The highest total soil organic carbon was obtained at the soil surface horizon with a slope of 0-8% and citronella was planted. This pattern of total soil organic carbon is similar to that of sesquioxide bound organic carbon, but is not consistent with that of free clay bound organic carbon.
Bener Meriah district is one of the arabica coffee producing regions in Indonesia with an average production of 700-800 kg ha−1 year−1. Most of arabica coffee in this area are grown in Andisol. This study aims to determine the P status of Andisol, namely P-available, P-total, P-retention, P content of arabica coffee leaves and the correlation between soil P-available and P content of arabica coffee leaves in Bener Meriah district. This research was conducted using survey methods. The observed parameters were made on Andisol planted with arabica coffee which is located at an altitude of 1,200-1,400 m above mean sea level (AMSL) at slopes 0-3, 3-8, 8-15, 15-30, and >30% respectively. The results showed that Andisol Bener Meriah has a P-available ranging from 0.3 to 12.81 ppm (very low-high). Most of the Andisol observed (73.33%) had P-available at very low and low levels. Andisol Bener Meriah has a P-total ranging from 159.4 to 1,246.7 ppm (low-very-high). Most of the Andisol observed (73.33%) have P-total at moderate, high and very high levels. Andisol Bener Meriah has a P-retention ranging from 85.2 to 87.4%. Arabica coffee leaves have P content levels ranging from 0.10% to 0.23%. Most of the arabica coffee leaves (78.57%) were observed have P content at a minimum level.; there is a close relationship between soil P-available with P content of arabica coffee leaves with a value of r = 0.97.
Currently, waste from patchouli distillation process is unutilized. It is known that the waste still has high nutrient content and has the potential as raw material for organic fertilizers. In this study, we investigated the potential of Trichoderma harzianum, T. asperelum, and Pseudomonas aeruginosa as biodecomposer in patchouli waste composting process. The bio decomposers were inoculated to patchouli waste to determine the effect on composting process time, maturation and compost chemical properties. T. harzianum and T. asperelum were added to the compost raw material in the form of pellet (15 g). While P. aeruginosa added suspension at 108 as much as 20 ml. The results showed that the inoculation of T. harzianum, T. asperelum and P. aeruginosa accelerated the decomposition process and improved the compost texture. Chemical properties analysis indicated that the compost produced meet Indonesia compost standarisation. This study revealed that T. harzianum, T. asperelum and P. aeruginosa are potential patchouli waste decomposers.
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