Selecting Monitoring Variables in the Manual Composting of Municipal Solid Waste Based on Principal Component Analysis

Effects of organic fertilizers produced from fish pond sediment on growth performances and yield of Malabar and Amaranthus vegetables

“…To make the sludge more suitable as organic fertilizer, it was complemented with peanut shell and coconut fiber, which contained higher contents of TN, TP, and TK than many other organic amendments that have been used in previous studies, such as rice straw, water hyacinth (Thanh et al, 2015;Da et al, 2020Da et al, , 2021, wheat straw, potato plant residues, mustard stover, and freshly cut grass (Karak et al, 2013;Drózdz et al, 2020). Overall, the results show that organic composting is an effective way to reuse fish pond sediments and local agricultural waste in a mixture that can be converted into relatively valuable organic fertilizers for vegetable farming and other agricultural production (Karak et al, 2013;Thanh et al, 2015;Saldarriaga et al, 2019).…”

“…The physicochemical properties of the composting products varied between treatments (Table 3) because they were influenced by the initial material used, the duration of the decomposition step, and the conditions during the process (e.g., moisture content, temperature, pH, degree of aeration, the ratios of C/N, and the physical structure of the raw materials) (Zhu, 2007;Cofie et al, 2009;Saldarriaga et al, 2019). The nutrient content of the organic fertilizer produced in our study was in good agreement and within the range of the nutrient content found in green waste composts (Sun et al, 2012); organic fertilizers produced from combinations of fish pond sediments, water hyacinth, and rice straw (Thanh et al, 2015;Da et al, 2021); fish pond sediment composted with fresh grass and wheat straw (Drózdz et al, 2020); and agricultural wastes composted with FPS (Cofie et al, 2009;Karak et al, 2013).…”

Portable and Low-Cost Respirometric Microsystem for the Static and Dynamic Respirometry Monitoring of Compost

“…Compost was prepared with garden waste and organic matter with a proportion of 1:10, respectively, inside a rotary drum of 220 L. Compost analysis was monitored through temperature and respirometry measurements one time per week for two months. This monitoring frequency was selected according to different authors [13,26,42] related to the time the process takes to present significant variations. In addition, the commercial Ecozone System, used as a reference, took 24 h and a great amount of sample, that had to be discarded, to complete each measurement.…”

“…However, there are important limitations for its use in composting at small and medium scales, due to the fact of their non-portable and ex-situ characteristics that are associated with the increase of costs and difficulties in the shipment of samples to laboratories. In addition, the use of such techniques requires trained manpower throughout the process [9,25,26].…”

Teor de sacarose, acúmulo de lignocelulose, dimensionamento celular e digestibilidade >i<in vitro>/i< de entrenós de cana-de-açúcar em relação ao estágio de maturação e a genótipos de >i<Saccharum>/i< spp

“…Descrição da composição química e da digestibilidade in vitro de amostras de cana-de-açúcar em estágios de desenvolvimento progressivos a partir da análise multivariada de componentes principais‖ redução da dimensionalidade nos dados ocorre simultaneamente à redução do número de atributos que apresentam correlação entre si(SALDARRIAGA et al, 2018). Este processo busca reter a máxima variabilidade existente nos dados, porém restringe a avaliação das combinações lineares entre as variáveis, reduzindo assim o número de variáveis avaliadas.MetodologiaOs dados referentes ao teor de fibras, à composição química da biomassa lignocelulósica e a digestibilidade in vitro de glucanas e xilanas foram as variáveis utilizadas para agrupar híbridos de cana-de-açúcar e entrenós em estágios de maturação sucessivos e contrastantes em função de uma análise de componentes principais.…”