Land use in Bogor Regency has diverse vegetation and different soil characteristics. Soil characteristics have an influence on land management. Improper land management has led to a decrease in microbial populations, biodiversity and a decline in soil quality and fertility. Soil fertility is produced by the interaction of the physical, chemical, and biological properties of the soil. This study aims to determine the correlation of soil biological and chemical properties in several different types of land use in Bogor Regency. Soil sampling was carried out using the purposive random sampling method with five replicates. Soil samples were taken at a depth of 0-20 cm by ±1 kg. The research site includes eight land uses namely bamboo gardens, sengon gardens, lamtorogung gardens, and dragon fruit orchards. The results of the analysis showed that the dragon fruit field had an acid pH with very high organic C and total N levels with the highest fungal population of 2.27 x 105 CFU g-1. Meanwhile, bamboo fields with an acid pH also have a medium organic C content and low total N with the lowest total fungi population of 0.37 x 105 CFU g-1. Azotobacter populations and respiration values had the highest correlation with the total P content of the soil. The correlation value of the total population of fungi was the highest, with a total N levels of 0.427.
Pesticides are widely used in agriculture, including on peat soil. The objective of this study was to analyze the effect of the application of paraquat, difenoconazole, and butylphenyl methylcarbamate (BPMC) on CO 2 emissions and concentrations of phenolic acids in a peat soil. Peat soil sample was taken in District of Pulang Pisau, Central Kalimantan. The peat soil was applied with 1.89 mg kg -1 paraquat, 1.72 mg kg -1 difenoconazole and 1.65 mg kg -1 butylphenyl methylcarbamate (BPMC), then the soil was incubated for 1, 2, 4 , 5, 7, 10, 14, 21, 26 and 30 days. The results showed that the application of pesticides on peat soil increased CO 2 emission, and decreased CH 4 emission and phenolic acid concentrations up to 30 days of incubation. The CO 2 emmisions were derived from C of degraded pesticides and from C of phenolic acids, although the oxidation reaction was not accompanied by the change of soil pH.Keyword: CO 2 emission, phenolic acids, butylphenyl methylcarbamate (BPMC), difenoconazole, paraquat, peat soil Pestisida banyak digunakan di lahan pertanian, termasuk di tanah gambut. Penelitian ini bertujuan untuk mempelajari pengaruh pestisida terhadap emisi CO 2 , dan konsentrasi asam fenolat pada tanah gambut. Contoh tanah gambut diambil dari Kabupaten Pulang Pisau, Provinsi Kalimantan Tengah. Contoh tanah tersebut diberikan pestisida dengan bahan aktif paraquat (1,89 mg kg -1 ), difenoconazole (1,72 mg kg -1 ) dan butylphenyl methylcarbamate (BPMC, 1,65 mg kg -1 ) dan selanjutnya diinkubasi di laboratorium selama 1, 2, 4, 5, 7, 10, 11, 14, 21, 26, dan 30 hari. Pemberian pestisida pada dosis anjuran selama 30 hari meningkatkan emisi CO 2 [metode titrasi], dan menurunkan emisi CH 4 . Pemberian pestisida selama 30 hari meningkatkan emisi CO 2 , dan menurunkan emisi CH 4 dan konsentrasi asam-asam fenolat di dalam tanah gambut. Emisi CO 2 berasal dari oksidasi C asam-asam fenolat dan bahan-bahan aktif pestisida, dimana reaksi oksidasi ini tidak disertai dengan perubahan pH tanah.
The price of the AB mix is relatively high, so it needed to find another alternative with a more economical price. One of the alternatives is Liquid Organic Fertilizer (LOF). This study aimed to know the quality of LOF made from banana peels and chicken egg shells, the effect of LOF on the water spinach grown in the hydroponic wick system, and the possible use of LOF as a substitute for AB mix. The experiment consisted of three stages. The first stage was the nutrient analysis of raw materials. The second stage was the production of LOF and nutrient analysis. The results of fermented fertilizers are called POC PT. The third stage was an experiment on water spinach in a hydroponic wick system. The experiment used a completely randomized design with five fertilizer treatments, namely P0 (control), P1 (AB mix nutrition), P2 (LOF PT 150%), P3 (LOF PT 100%), P4 (LOF PT 50%) in three replications. The results showed that LOF, which was fermented for three weeks, had a low nutrient content and was below the Ministry of Agriculture standard. The available N content in POC PT was low, so Ca(NO3)2 fertilizer was added to POC PT. The LOF PT treatment had higher plant growth parameter than the control treatment. Thus, the treatment of LOF PT could not substitute AB mix.
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