The threshing device is the core component of grain combine harvester, and straw guide board plays an important role in device. In past, guiding structure could not optimize working performance machine by adjusting spiral angle. this study, adjustable was designed, movement model on analyzed. response surface method used to perform field experiments, experimental data were analyzed using quadra...

It is widely believed that hexaploid wheat originated via hybridization of hulled tetraploid emmer with Aegilops tauschii (genomes DD) and that the nascent hexaploid was spelt, from which free-threshing wheat evolved by mutations. To reassess the role of spelt in the evolution of Triticum aestivum, 4 disomic substitution lines of Ae. tauschii chromosome 2D in Chinese Spring wheat were developed...

The threshing mechanism is the main component of combine harvester on which grain separation and cleaning qualitative work indicators depend. It important to ensure that all components, including drum bearings other combine, are working properly reliably. There many places in where it not possible measure bearing vibrations directly without dismounting them, since there no suitable spot mount a...

Testing the reliability of threshing unit is difficult and thus often neglected before harvesting season, which can result in breakdown maintenance during peak time difficult-to-access areas for sensor mounting. In this paper, vibration analysis condition combine harvester was performed by introducing bracket inaccessible locations. The Adash A4900 Vibrio M analyzer (Adash spol. s.r.o., Ostrava...

Wheat domestication from wild species involved mutations in the Q gene. The q allele (wild wheats) is associated with elongated spikes and hulled grains, whereas the mutant Q allele (domesticated wheats) confers subcompact spikes and free-threshing grains. Previous studies showed that Q encodes an AP2-like transcription factor, but the causal polymorphism of the domestication traits remained un...

To solve the problems of congestion and increased power consumption wheat combine harvesters (WCHs) caused by excessive feed rate, this paper proposes a method to reduce rate decreasing length stalk designs double-cutterbar header (DCH). Using threshing test bench taking stalk, speed tangential rotor as influencing factors conveying time index, influence different parameters on performance was ...

the objective of this study was to evaluate different pistachio hullers and determine the proper harvest time of pistachio nuts for hulling. three pistachio hulling machines (helical drum, helical- blade drum, rubber drum) at three harvest times and 15 days interval were evaluated. the hulling efficiency, percentage of damaged nuts, faulty hulled nuts and unhulled nuts were measured at each tim...