Coffee processing residues are rich in several nutrients, the dominant of which is K, which will vary in concentration with the type of coffee husk (Garcia et al. 2004).
Two types of rice husk dust (RHD) with five application rates were tested for their influence on selected soil physical properties and growth of maize in a heavy clay loam soil.
Two types of rice husk ash with average particle size of 5 micron (ultra fine particles) and 95 micron and with four different contents of 5%, 10%, 15% and 20% by weight were used.
As indicated in Figure 3, the isothermal curve of Zn2+ for NaOH-treated rice husk showed a typical Langmuir-type pattern.
The matured compost was first milled and sieved through a 2 mm sieve to obtain a uniform texture before mixing with the rice husk biochar to prepare three growing medium types: a 100% FS-based compost (FSC), a 100% rice husk biochar (RHB), and a 50% FS-based compost: 50% rice husks biochar mix (FSC-RHB).
The study was conducted over a 50-day duration using two different types of coconut wastes: coconut husk (CH) and spent coconut flakes (SCF).
The rice cultivation procedure results in two types of residues, straw and husk, of which a variety of valuable chemicals can be derived.
For the raw biomass conversion, various types of raw biomass including rice husk, wheat straw, bagasse, cotton stalk, corn cob, and jute that were previously collected from agricultural fields located in different parts of India and Bangladesh are used.
The data show that the iron content in black rice is higher than in the other rice types, and in rice chaff and husk the content is still fairly high.
Industries are largely of the handicraft or cottage type, including the making of coir (coconut-husk fibre) and coir products, boatbuilding, and construction.
