Volume 25, Issue 1 (1-2023)
Abstract
Surfaces of the toothed harrow were improved by using different coating materials and methods. Four different coating methods and special alloy powders were used as coating materials. TiCN was applied with PVD, and the WC-Ni-Co-Cr-Si-Fe-B powder mixture was applied with HVOF. The coating thicknesses was 2 µm and 5 µm in PVD, 500 µm in the HVOF, and 500+2 µm in the application where HVOF + PVD were used together. The wear trials were carried out in the laboratory, at a 50 km distance, in a double-speed trial pattern that converted circular motion to linear motion. The trial model was used to simulate the wear that occurs under real operating conditions in the soil. As a result of the wear trials carried out under the same operating conditions, a total material loss of 3.99 g occurred in the control (uncoated) harrow, the wear resistance increased, and less material loss was observed in the coated harrows. The sample coated with the PVD method had the lowest value with a material loss of 0.14 g. Material loss for other coated samples PVD-5µ, HVOF-500µ, and PVD-2µ+HVOF-500µ was 0.19, 0.28, and 0.18 g, respectively. When the amount of wear in the uncoated sample was 100%, the proportional loss in PVD-2µ, PVD-5µ, HVOF-500µ, and PVD-2µ+HVOF-500µ coated samples was calculated as 3.41, 4.85, 7.16, and 4.57%, respectively.
Volume 27, Issue 4 (July 2025)
Abstract
Increasing need for drought adaptation measures to conserve water and sustain crop yield in water-scarce regions is driven by severe and recurrent droughts. Achieving sustainable production entails studying deficit irrigation as a means to enhance water productivity and selecting genotypes resilient to soil water deficits. In the present study, 17 different melon (Cucumis melo L.) genotypes collected from the Van Lake Basin and 3 hybrids and 1 standard melon cultivar for control purposes were used for this purpose. The study was carried out under climate room conditions. Two different irrigation levels (I100: 100% full irrigation, I50: 50% Deficit Irrigation- DI) were applied in the study for deficit irrigation. Water applications started with the emergence of the second true leaf of the plants and, after one-month, different growth, nutrient, and enzyme contents of the seedlings were determined. In general, it was determined that deficit water application negatively affected seedling growth, and root dry matter, stomatal opening and density, potassium, APX and SOD enzymes, and MDA content increased, while the other tested parameters decreased. The melon genotypes of the Van Lake Basin were found to vary in response to deficit irrigation treatments.
