Effects of five non‐agricultural organic wastes on soil composition, and on the yield and nitrogen recovery of Italian ryegrass

Abstract

Abstract. We studied the effects of five diverse non‐agricultural organic wastes on soil composition, grass yield and grass nitrogen use in a 3–year field experiment. The applied wastes were distillery pot ale, dairy salt whey, abattoir blood and gut contents, composted green waste (two annual applications each), and paper‐mill sludge (one annual application). With the exception of N immobilization in the paper‐mill sludge treatment, the wastes had no unfavourable effects on the soil. In the 2–year treatments, grass dry matter yields from the abattoir and distillery wastes (26.3 t ha−1) were larger than those from a NH4NO3 fertilizer treatment (24.3 t ha−1) and from the dairy waste (20.4 t ha−1) and composted waste (22.8 t ha−1). Yield and N recovery were impaired markedly after the single application of paper‐mill sludge, both in the year of application and in the following year. The results demonstrated clear differences in the ability of the applied wastes to provide crop‐available N. We conclude that in order to improve prediction of both the benefits and risks from waste recycling to land, more information should be gathered on soil/waste/crop interactions.

Evaluation of the Effectiveness of Bokashis, Compost and Biopesticide Solution on the Productivity of Amaranth (Amaranthus hybridus) in Southern Benin

“…It would also be interesting to evaluate in other studies the environmental impacts of the application of bokashis (because of acid pH) as an alternative to amendment in market gardening systems in southern Benin. proving the availability and aeration of nutrients and water through improved structure [29][30][31][32][33][34]. The different nutrients higher at the levels of bokashis compared to the compost are made available to amaranth plants for the improvement of growth.…”

Le guano, fertilisant organique naturel alternatif au fumier, testé sur la production de la laitue verte (<i>lactuca sativa</i> L.) dans l’oasis de Balla (département de Gouré), Zinder, Niger

“…Ceci pourrait être dû à la teneur élevée en azote du guano. Etant un élément constitutif de la chlorophylle, l'azote est un facteur déterminant dans la croissance et la détermination du rendement des plantes (Sikora et Szmidt, 2001;Douglas et al, 2003;Magnan, 2006). La différence entre la vitesse de minéralisation du guano beaucoup plus rapide comparée à celle des autres fertilisants expliquerait certainement l'efficacité en matière d'une meilleure production.…”

Optimizing N and P recycling from organic amendments via agroecological incentives and concepts – scope for further developments

“…It is generally accepted that organic amendments are useful sources of nutrients and organic matter for use in the maintenance of soil fertility and crop production (Douglas et al, 2003;Goss et al, 2013). However, for reliable fertilizer planning and to allow confidence among arable farmers in the use of manures as nutrient sources, it is necessary to know the nutrient content of the manures.…”