Dynamic analysis of composted material and its relation to nutrients release [electronic resource].

Includes references.

This experiment was carried out in Faculty of Agriculture, Menofiya University to study the possibility of composting organic wastes such as rice straw (RS), maize stalk (MS), nutritional products refuse (NPR), farmyard manure (FYM) and poultry manure (PM), with or without mineral fertilizers and evaluate the physical and chemical changes that occurred during the decomposition process. Three piles were made. Pile A was a mixture of RS, MS, PM and NPR (as organic activators) at ratio 2:1:1:1/2 by weight respectively. Pile B mixture of RS, MS, FYM and NPR (as organic activators) at rate 2:1:1:1/2 by weight respectively. Pile C mixture of RS, MS at the rate 2:1, 10% of farm yard manure, 5% of urea and 1 % super phosphate which used as chemical activators. The values of bUlk density, electrical conductivity and cation exchange capacity of the composted material were significantly increased with the increase of composting periods. The pH values were slight decreased, thereafter tented to be increased to reach maximum pH values of 8.94, 8.52 and 8.20 after 8 weeks of piles A, Band C respectively. However a decrease again was induced in pH values after 60 days of incubation. The changes in organic carbon, organic matter and CIN ratio showed a significant decrease gradually with the increase of composting periods. The values of total-N were significant increased from 1.6, 0.98 and 1.63 % at the first turning to 2.26, 1.64 and 2.40 % after 120 days of composting for piles A, Band C respectively. Available macro and m;Cioiiutrfents contents (mg/kg) were augmenting li,isarly .vit.': elongation the periods of compostJng. All of the determined parameters were significantly affected with the period of composting.

Summary in Arabic.

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