ABSTRACT Fatigue vibration is a primary cause of fruit damage during transportation. Drawing on the Palmgren–Miner fatigue accumulation damage theory and the correlation between fruit vibration damage characteristics and external vibration excitation, this paper proposes a fruit vibration fatigue accumulation damage model and its method for parameter determination. Using pears as the research objects, we conducted fatigue damage vibration and critical fatigue damage vibration tests under various conditions to determine the vibration fatigue constant of the pears. By utilizing the critical value of the damage area specified in the pear grading standard for premium grade, we derived the threshold acceleration value for pear damage. These findings serve as a technical foundation for advancing our understanding of fruit vibration fatigue damage mechanisms and guiding the development of cushioning packaging to protect fruit from vibrations. transportation PalmgrenMiner Palmgren Miner excitation determination objects grade vibrations

ABSTRACT In the satisfactory development of soybeans an ally is quality seeding and soil preparation. The aim was to evaluate the quality of soybean seeding under different speeds and cover crops. The experiment was conducted in a commercial soybean crop, using a high-performance pneumatic seeder. The design experimental was randomized blocks, in 2x2 strip arrangement and nine repetitions. The factors consisted of two seeding speeds (7.0 km h-1 and 8.5 km h-1) and two cover crops (Urochloa brizantha cv. Marandu and Urochloa ruziziensis). The operational quality was analyzed by statistical quality control, statistical process control and boxplot. It was found that U. ruziziensis provided more uniformity of coverage and soil humidity than U. brizantha cv. Marandu, but with lower straw produced. It is recommended speeds of 7.0 and 8.5 km h-1 for no-till soybean in U. ruziziensis straw, and 7.0 km h-1 in U. brizantha cv. Marandu straw. preparation crop highperformance high performance seeder blocks x 2x repetitions 70 7 0 (7. h1 h 1 h- 85 8 5 8. cv ruziziensis. . ruziziensis) boxplot U produced 7. notill no till (7 (

ABSTRACT Chickpea has recently gained prominence in agriculture, being an excellent option for crop rotation in areas cultivated with soybean or corn. Seeds must have good physiological quality, mainly during storage, to ensure crop success. Seeds undergo metabolic reactions that impair their performance when stored improperly. In this context, a study was carried out to evaluate the physiological variables of the chickpea cultivar BRS Aleppo in different types of packaging and storage environments. The analyses were performed with seeds evaluating water content, germination, first count, and accelerated aging, according to established standards. Therefore, the physiological quality of chickpea seeds can be preserved through controlled storage in hermetic packaging, thus ensuring their viability and vigor over time. agriculture corn success improperly context environments content germination count aging standards Therefore time

ABSTRACT Under the conservation tillage model, corn stubble with a complex structure has become the main obstacle for the operation of tillage tools. To better design relevant tillage tools as a reference, this study established a discrete element model of corn stubble. The intrinsic parameters and partial contact parameters of corn single root (CSR) were obtained through physical experiments, and the maximum shear force (Fmax) of CSR was tested. Fmax was used as the response value, Plackett-Burman test, steepest climbing test, and Box-Behnken test were used to determine the optimal parameters of the discrete element model. The results showed that the coefficient of friction of CSR-CSR, the coefficient of friction of CSR-steel, and the bonded disk radius all had significant effects on Fmax (P<0.01). The optimal solution is when they are 0.81, 0.76, and 0.93 mm respectively. Under this condition, the relative error of Fmax between the simulation and the fitting equation was 2.85%. In addition, shear validation tests were conducted on CSR with different diameters. Finally, based on the actual size of the corn stubble, a discrete element model of the entire corn stubble was established, which can provide a reference for studying the crushing of corn stubble. (CSR experiments (Fmax tested value PlackettBurman Plackett Burman BoxBehnken Box Behnken CSRCSR, CSRCSR CSR, CSR-CSR CSRsteel, CSRsteel steel, steel CSR-steel P<0.01. P001 P P<0.01 . 0 01 (P<0.01) 081 81 0.81 076 76 0.76 093 93 0.9 respectively condition 285 2 85 2.85% addition diameters Finally P00 P<0.0 (P<0.01 08 8 0.8 07 7 0.7 09 9 0. 28 2.85 P0 P<0. (P<0.0 2.8 P<0 (P<0. 2. P< (P<0 (P< (P