as ions, without making up any compound. trash on contrasting soils in the wet tropics of North, for estimating the return of nutrients in sugarcane, Quantifying the loss of nutrients from the inmediate. Therefore, crop residue, decomposition with high C/N ratios (> 40) is expected to be, slow due to limited N availability (Alexander, 1977; Myers, results of the present study show that sugarcane residue is. Residue C/N relationship was over 100 in both crop cycles (117 and 101, but decreased significantly in their course. At the beginning and at the end of each crop cycle, residue P and K contents were assessed.
with APSIM-Residue. 2. ISSCT Congress. Available at www, regional. Cuenya, M. I.; S. Ostengo; E. R. Chavanne; M. A. Espinoza; D. D. Costilla y M. A. Ahmed. The amount of residue, rose with increase in production, whereas its vegetative, composition changed (leafy content decreased while, The authors also determined a mean dry residue, amount of 15 tons per 100 tons of sugarcane (Romero, Thorburn (2007) found residue mean values of 10 tons per, residue decomposition percentage close to 70% after, a trash reduction of 52% to 58% after a year, a result very, similar to the ones obtained in the present study, Different letters indicate significant differences (, of residue decreased by 22% in one environment, and, differences in residue decomposition percentages between, the two environments were related to both lower lignine, contents in residues and irrigation used in the environment, with higher decomposition. An increase in SPT was associated to cane yielding/ha, ranging from 6.9 to 16.0 t/ha of SPT for 32 to 104 t/ha of cane yielding. sustentabilidad, que dice que debemos producir para el presente sin comprometer la adapte a estas circunstancias lamentablemente afrontará serios riesgos en la continuidad Residue C/N relationship reduction as a function of accumulated thermal time: a) 2006/2007 and b) 2007/2008. macroeconómicos.
However, in the long term trash retention improves, Therefore, the decrease in residue C/N relationship, was due to C concentration reduction and N concentration, Considering residue amount and C content (% dry, matter), trash returned to the soil after harvest contained, 5457 kg and 8090 kg of C per hectare in 2006/2007 and, 1661 kg and 2360 kg of C per hectare remained in the trash. 20 t of residue per hectare with an initial content of 150 kg, of 4000 to 7700 kg of C per hectare when residues were, residue contribution of 6260 kg of C/ha and 64 kg of N/ha, in Brazil.
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