Optimization of technological measures to promote cereal straw decomposition in the post harvest period
2014
Arlauskiene, A., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr. (Lithuania) | Velykis, A., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr. (Lithuania) | Slepetiene, A., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr. (Lithuania)
Investigations of post harvest technological measures for promotion of initial winter wheat straw decomposition were carried out over the period 2008-2011 in the model field experiments at the Joniškėlis Experimental Station of the Lithuanian Research Centre for Agriculture and Forestry. Measures used for straw decomposition: 1) stubble cultivation at 10 cm depth, straw removed from the field, 2) nitrogen fertilizer use on non-incorporated straw, 3) nitrogen fertilizer use with straw incorporation during stubble cultivation, 4) slurry use with straw incorporation during stubble cultivation. Changes in dry matter, carbon, nitrogen, phosphorus and potassium were observed at 9 months after incorporation the straw. Straw decomposition was slowest when straw was spread on the surface with N fertilizer without incorporation into the soil. DM content in the straw decreased similarly when it was incorporated with N fertilizer or with slurry. C decreased by 15.5 % in straw incorporated only with the stubble cultivator and with N fertilizer – 20.4 % compared with the former quantity. C:N decreased from 100 to 43 in straw, when it was incorporated together with N fertilizer. This affected higher mineral nitrogen Nmin. of soil by 10.3 % in spring if compared to the plot without straw.
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