No-till planting can promote soil and water conservation and has gradually been adopted on the North China Plain where an annual wheata??corn double cropping system serves as the main cropping system. Corn is planted in June immediately after the winter wheat harvest so that fields are covered with wheat residues. The presence of wheat straw makes it difficult to maintain uniform corn seed spacing and sowing depth. To overcome these problems, a new seeder unit has been developed with a depth-control mechanism on a single-sided gauge wheel. A study was conducted to compare the performance of this seeder unit with two conventional seeder units (with depth-control mechanisms using double-sided gauge wheels and a rear gauge wheel) by testing in fields with two different amounts of residue (0.78 kg/m2 and 0.64 kg/m2). Seed spacing, sowing depth, and emergence time were measured after planting. The results indicate that the newly designed seeder unit with a single-sided gauge wheel performs better on seed spacing, sowing depth and emergence time uniformity, particularly in fields with a small amount of residue, with the quality of feed index, quality of sowing depth index and quality of emergence time index of 91.90%, 95.45% and 87.87%, respectively. The new seeder unit can meet the requirements of no-till planting for corn.
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机译：免耕种植可以促进水土保持，在华北平原已逐渐采用，其中一年生小麦，玉米双季种植为主要种植方式。冬小麦收获后立即在6月播种玉米，使田地上覆盖有小麦残留物。小麦秸秆的存在使得难以维持均匀的玉米种子间距和播种深度。为了克服这些问题，已经开发了一种新的播种机单元，该播种机单元在单侧测距轮上具有深度控制机构。通过在两种不同残留量（0.78 kg / m2）的田间进行测试，进行了一项研究，以比较该播种机单元与两个常规播种机单元（具有使用双面规轮和后规轮的深度控制机构）的性能。和0.64千克/平方米）。种植后测量种子间距，播种深度和出苗时间。结果表明，新设计的带有单侧测距轮的播种器单元在种子间距，播种深度和出苗时间均匀性方面表现更好，特别是在残留量少的田地上，其进料指数，播种深度质量都更好指数和出苗时间指数分别为91.90％，95.45％和87.87％。新的播种机可以满足免耕玉米种植的要求。
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