The quality inspection method for land preparation operations involves a series of systematic checks to ensure that each step of the process meets the required standards. This method applies specifically to plowing, deep loosening, rotary tilling, ridge formation, soil compaction, and seeding with fertilizer. The tools used include wooden rulers, steel rulers, measuring tapes, and ropes, which are essential for accurate measurements.
For depth measurement during plowing (A3.1), 10 random points are selected along diagonals in different cultivating areas. At each point, three measurements of trench wall height are taken, and 1-2 cm is subtracted to determine the actual depth. After work, five points are measured along the diagonal, using a wooden ruler as a benchmark. A steel ruler is inserted into the soil to measure the depth, with adjustments made based on weather conditions—10% reduction if no rain, 20% if there has been rainfall.
Consistency of tillage depth (A3.2) requires checking after all fields have been processed. For plots smaller than 3 hectares, 4-5 points are checked, while larger plots require more. Each point measures 5 depths along the direction of cultivation, and any deviation from the planned depth must not exceed 5% to be considered acceptable.
Turning and coverage (A3.3) involve randomly checking two passes during or after operation. The area of the immediate exit is measured and compared to the total area. Coverage is visually assessed, with over 90% weed coverage considered acceptable.
Ground level (A3.4) is checked by selecting three random points in the plot. A straight line is drawn perpendicular to the cultivated area, and vertical distances are measured every meter. The difference between the maximum and minimum values indicates the ground’s unevenness.
Ridge opening and closing (A2.5) involve measuring 3 points per 20 hectares, with a 50m distance between them. Ridge width and depth are measured using a straight ruler, and closed ridges are inspected by cutting open and measuring the height.
For deep loosening (B3.1), 3-5 points are selected along the block’s diagonal. Three grooves are measured at each point, and the average depth is calculated. Errors are determined by comparing the actual depth to the planned one.
Row spacing (B3.2) involves randomly selecting 2-3 points in the field, measuring the distance between ridges or deep ridges. Depth of each groove is also recorded.
Depth-deep-groove joint (B3.3) checks the width of the upper and lower parts of the deep groove. Stratification (B3.4) measures the depth of the first and second layers of loose soil.
The quality inspection for hoeing, rotary tilling, and weeding (C3.1–C3.4) includes checking the depth of cultivation, soil crushing, ground leveling, and the size of soil clods. Soil compaction (E2.1) is measured by taking samples and calculating bulk density.
In seeding and fertilization (F3.1–F3.5), sowing straightness, spacing error, seed accuracy, sowing depth, and broken seedlings are evaluated. Plastic film covering (G3.1–G3.3) checks the width of the light surface, mechanical damage, and the thickness of the soil cover.
Finally, the tillage quality inspection (H3.1–H3.3) focuses on plow depth, slough thickness, and crop injury rate, ensuring that the operation is both effective and minimally damaging to crops. Each test is performed systematically to maintain high-quality agricultural practices.
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