Abstract
A study on the composting process of wheat straw was carried out after a 2 3 factorial design to examine the effect of the composting time, the addition of horse manure and two different nitrogen sources. Several chemical parameters with special reference to the different forms of nitrogen compounds were analysed in composted straw and the agrobiological properties of such composts were evaluated in a greenhouse experiment. After computing the values of the dependent variables (compost and soil) in terms of the main effects and interactions between the independent variables, the optimum conditions were discussed for the whole range of the experiment. The results obtained suggested that the levels of the factors causing the greatest chemical transformation of the straw were not necessarily the same as those responsible for the most favourable response of the plant.
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