The Differentiations in the Soil Nematode Community in an Agricultural Field after Soil Amendment Using Composted Coffee Waste in Various Concentrations

Abstract

In a field experiment, composted coffee waste (CW) was used as soil amendment at three different rates (2%, 4%, and 8%) in plots cultivated with wheat; the effects on the soil nematode community and plant growth were studied. By sampling twice, i.e., three and six months after the application of treatments (3MAA and 6MAA), the duration of these effects was also evaluated. Treatment using composted coffee waste (CW) led to an increased abundance of all soil nematodes, especially of bacterivores and fungivores, probably via a bottom-up effect of CW on the soil community. The most-affected genera were the enrichment opportunists Panagrolaimus and Rhabditis, which increased after CW addition in a dosage-dependent way at 3MAA, while at 6MAA they were replaced by general opportunists, mainly bacterivorous and fungivorous genera; a nematotoxic effect of CW was also observed in the 6MAA condition. The nematode indices and the metabolic footprint indicated an enriched and vigorous soil three months after CW addition and a lower enrichment status of the soil together with a higher fungal participation in the decomposition pathway six months after treatments. However, in the 6 MAA condition, the soil nutrient values were higher in the CW-treated plots. None of our treatments inhibited or enhanced plant growth.

The Effect of Varying Olive Mill Wastewater Concentrations on Soil Free-Living Nematode Communities and Lettuce Growth

“…This resulted in slower decomposition by microorganisms and an increased dominance of fungivores in the long term. These findings differ from those recorded after the incorporation of other types of organic amendments with high C/N ratios in the soil system, which typically increase bacterial populations, causing a spike in bacterivorous nematodes [41,42]. Several studies reported increased fungal populations and fungal/bacterial ratios in OMW-amended soils, suggesting that OMW serves as a suitable substrate for fungi [36,[43][44][45][46] and thus explaining the dominance of fungivores post-OMW addition.…”

The Effect of Recycled Spent Coffee Grounds Fertilizer, Vermicompost, and Chemical Fertilizers on the Growth and Soil Quality of Red Radish (Raphanus sativus) in the United Arab Emirates: A Sustainability Perspective

“…The current results from the dry weight analysis clearly show that the fertilizer type significantly influences the dry weight of red radish plants. Much research has proved the effect of SCGs and VC on plant measurements such as weight, length, leaf development, surface area, and soil properties [7,8,37,39,41].…”

“…Nevertheless, certain studies have indicated that these compounds are accountable for the chelating characteristics of SCGs, thereby rendering their removal inadvisable. Research has also investigated the utilization of SCGs as bio-chelates, resulting in a combination of waste material and micronutrients that can be used to enhance the nutritional value of edible plants through biofortification [7,8,37,41,42].…”

“…Hence, pursuing strategies to reduce these rates is considered immensely valuable. The utilization of SCGs has experienced a significant increase in popularity in recent years, primarily because they contain a high concentration of organic compounds such as fatty acids, lignin, cellulose, hemicellulose, and other polysaccharides [8]. Studies have explored their potential application in improving soil fertility and increasing agricultural productivity [8].…”

Effect of Spent Ground Coffee, Vermicompost and Chemical Fertilizers on Organic Red Radish (Ravanello Cherry Belle) Plant and Soil Quality

“…The utilization of SCG has experienced a significant increase in popularity in recent years, primarily because it contains a high concentration of organic compounds such as fatty acids, lignin, cellulose, hemicellulose, and other polysaccharides. Studies have been undertaken to explore its potential application in improving soil fertility and increasing agricultural productivity [8].…”