Akademik Veri Yönetim Sistemi
PAKISTAN JOURNAL OF AGRICULTURAL SCIENCES, cilt.58, sa.2, ss.429-438, 2021 (SCI-Expanded)
This study aimed to determine the effects of tractor forward speed using shoe furrow openers designed in different sizes (seed drop height) in the conventional and reduced tillage systems on the intra-row spacing, deviations from rows, sowing depth, and the metering unit performance of vacuum precision planter (multiple index, miss index, quality of feed index and precision). The experiments were carried out at the 12, 18, and 24 cm seed drop heights and 1.1, 1.5, and 2.2 ms(-1) tractor forward speeds using sunflower and maize seeds at two separate fields. Target seed spacing was 400 and 206 mm for sunflower and maize, respectively. According to the results, the optimal values for plant spacing were determined as 399.7 and 204.4 mm at the 1.1 ms(-1) forward speed for sunflower and maize, respectively, and 403.5 and 209.2 mm also in the 18 cm seed drop height. However, such values substantially increased when forward speed increased to 2.2 ms(-1) and seed drop height to 24 cm. The precision of the distribution of the plant spacing for tillage systems, seed drop heights and forward speeds experienced was well below 29%, and therefore is acceptable for both sunflower and maize seeds. The values closest to the target sowing depth were obtained from low forward speed and high seed drop height. Overall, with the increased tractor forward speed the quality of feed index decreased. The highest quality of feed index for sunflower and maize crops was about 88% for both tillage systems.