Organic matter is one of the most important components of the
soil that affects its fertility. The organic carbon (C) to nitrogen ratio
(C/N) of the organic wastes is a useful parameter to predict the fate
of organic N in soil [46]. Hazelnut husk was composted with soil
(by Calıskan) [47]. The composting process was carried out using
a mixture of HH, urea (46% N) and fine grained soil; in 1 m3 of volume,
a layer of the mixture was established with 57.5 kg husk,
1.15 kg urea and it is covered by 2.5 kg soil, producing 1–2 cm of
thickness. The height of the whole mixture was about 25 cm. This
layering process was repeated three times and the relative
humidity was kept at 65% by adding water [47]. The application
(a) Shelled hazelnut (b) Kernel and shell of hazelnut
Fig. 2. Shelled and unshelled form of hazelnut.
Table 1
Chemical composition of hazelnut husk.
Contents %
Holocellulose 55.1
a-Cellulose 34.5
Lignin 35.1
Ash 8.22
Table 2
Calorific values of some agricultural residues.
Material Kcal/kg
Coconut husk 3500
Briquettees of rice husk 3881
Palm husk 3900
Almond hull 4094
Soya bean husk 4170
Peanut hulls 4190
Coffee and oil palm husk 4200
Cotton husk 4400
Babassu husk 4500