Influence of Post-Harvest Management of Rice Crop on Red Rice Seed Bank

The incorporation of straw after rice harvest makes rice seed reduction difficult. On the other hand, it favors the decomposition of straw, enabling the preparation of the area in advance, thus allowing the preparation of the recommended planting period. The objective of this work was to assess the interference of different management techniques after harvest in rice-cultivated areas in reducing the viability of red rice seeds. The experiment was arranged in a randomized block design, in split-plots in time, with four replications. The treatments were arranged in a factorial design (7x6), consisting of factor A: [a] permanent water blade, [2] straw incorporation with dry soil tillage after rice harvest, [3] incorporation of straw with flooded soil after harvest, [4] incorporation of dry soil only in July, [5] incorporation of straw with flooded soil after harvest and area disking in July with dry soil, [6] incorporation of straw in dry soil immediately after harvest and area disking only in July with dry soil and [7] without incorporation. Factor B was composed of different timings of seed bank sampling for the presence of red rice. Sampling was initiated at harvest, occurring every thirty days until October. The greatest effect on seed bank reduction was verified when using implements that superficially incorporated the straw, such as the rolling knife, which acts on dormancy breaking, non-viability and stimulation of red rice germination.