Admixing Chaff with Straw Increased the Residues Collected without Compromising Machinery Efficiencies

Energies

Walter Stefanoni¹  Luigi Pari¹  Sergio Saia¹  Alessandro Suardi¹  Carina Gunnarsson²  Martin Sundberg² 

[1] Council for Agricultural Research and Economics (CREA)—Research Centre for Engineering and Agro-Food Processing (CREA-IT), Via della Pascolare, 16 - 00015 Monterotondo Scalo (Rome) Italy;Research Institutes of Sweden (RISE), Ultunaallén 4, 756 51 Uppsala, Sweden;

关键词: bioresource;    cereals;    commodity;    harvest index;    staple foods;    triticum;   

DOI  :  10.3390/en13071766

来源: DOAJ

【 摘 要 】

The collection of residues from staple crop may contribute to meet EU regulations in renewable energy production without harming soil quality. At a global scale, chaff may have great potential to be used as a bioenergy source. However, chaff is not usually collected, and its loss can consist of up to one-fifth of the residual biomass harvestable. In the present work, a spreader able to manage the chaff (either spreading [SPR] on the soil aside to the straw swath or admixed [ADM] with the straw) at varying threshing conditions (with either 1 or 2 threshing rotors [1R and 2R, respectively] in the combine, which affects the mean length of the straw pieces). The fractions of the biomass available in field (grain, chaff, straw, and stubble) were measured, along with the performances of both grain harvesting and baling operations. Admixing chaff allowed for a slightly higher amount of straw fresh weight baled compared to SPR (+336 kg straw ha⁻¹), but such result was not evident on a dry weight basis. At the one time, admixing chaff reduced the material capacity of the combine by 12.9%. Using 2R compared to 1R strongly reduced the length of the straw pieces, and increased the bale unit weight; however, it reduced the field efficiency of the grain harvesting operations by 11.9%. On average, the straw loss did not vary by the treatments applied and was 44% of the total residues available (computed excluding the stubble). In conclusion, admixing of chaff with straw is an option to increase the residues collected without compromising grain harvesting and straw baling efficiencies; in addition, it can reduce the energy needs for the bale logistics. According to the present data, improving the chaff collection can allow halving the loss of residues. However, further studies are needed to optimise both the chaff and the straw recoveries.

【 授权许可】

Unknown