Mineralizaed Nitrogen and Organic Matter Changer in Soil Amended with Crotalaria juncea L. Residues
Keywords:
nitrogen, mineralization, Crotalaria juncea L., Lampang Soil SeriesAbstract
This research aims to study the nitrogen mineralization from different parts of Crotalaria juncea L. on changed soil organic matter and mineral nitrogen in different duration. The study was Complete Randomized Design (CRD) with four replicates. Incubation experiment included six treatments as follow; (T1) control and 5 residues i.e. the roots (T2), stems (T3), leaves (T4), flowers (T5) and below and above-ground biomass, roots + stems + leaves + flowers (T6) of Crotalaria juncea L. A 100 g soil sample was placed in the container with 1.6 g of plant residues (5,000 g plant residue per rai). A laboratory incubation experiment was conducted for 10, 20, 40, 60, 80, 100 and 120 days under controlled conditions (25°C and 50 percent moisture of soil weight). The results showed that at 60 days, flowers, leaves and roots + stems + leaves + flowers of Crotalaria juncea L. displayed continuous mineralization by releasing a maximum of 167.13, 79.13 and 66.89 mg kg-1, respectively. At 80 days, maximum nitrogen mineralization of roots 44.12 mg kg-1 and stems 42.00 mg kg-1 were not statistically significant. Based on nitrogen mineralization of Crotalaria juncea L. at 60 days, release nitrogen content of plant residues equals to urea fertilizer around 45.37 kg. Using Crotalaria juncea L. as green manure crop can increase the maximum organic matter content about 1,382.37 kg per rai. However, total carbon and organic matter always changed, in contrast to nitrogen mineralization.
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