Decomposition and liberation of the nitrogen for the component residuals of a coffee agroecosystem
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Abstract
The quantification of the biomass (mg x ha–1 x año–1) and N turnover (kg. ha–1. year–1) of the leaves of the coffee and of the shade trees to the soil of the coffee agroecosistem was carried out monthly from January to December (19962005). To study the speed of decomposition and liberation of N of the vegetable remains, they got ready 24 bags of mesh of polyethylene of 20 cm x 15 cm with grills of 1 mm x 1 mm, in each bag the vegetable material was deposited in specific to study (50 g of fresh mass). The evaluations were carried out monthly until the 210 days, during the years 2003, 2004 and 2005. The contribution of biomass in the agroecosistema was among 7-8 mg x ha–1 year–1 of dry mass with a turnover of 169 kg x ha–1 x year–1 of N. The coffee leaves, the locust trash, the weeds and the desuckering had a process of immobilization of the N initially among 30 to 60 days and later on they liberated the nitrogen, its magnitude depended on the evaluated material. The rate of decomposition and the time of life of the residuals, they were in the following order: remains of arvenses trash of locust leaves of brown remains of the desuckering of the coffee.
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