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RTK—UAV monitoring of oat cover crop termination by a straight-bar roller-crimper amid weeds

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2021 ASABE Annual International Virtual Meeting  2100779.(doi:10.13031/aim.202100779)
Authors:   Muhammad Zakaria Hossain, Masakazu Komatsuzaki
Keywords:   Dry biomass, load cell, photogrammetry, VARI, Zadok scale.

Abstract. Cover crop management by rolling/crimping is relatively new in Japan and crimping attitude is still unclear, especially amid weeds. Thus, we studied the crimping behavior of oat cover crop in summer in Ibaraki University, Japan. Oat and weed samples were collected just before crimping and recorded the physical properties. The ground biomasses were also collected. The rolling performance (height reduction) and weed presence (Visible Atmospherically Resistant Index, VARI) were studied using photogrammetry (image by RTK-UAV). The study reveals that oat became suitable to be rolled on the 93rd day (Zadok scale: 86) since seeding. The major weeds during rolling were Digitaria ciliaris (DC), Chenopodium album L. (CA), Miscanthus sacchariflorus (MS), Oenothera biennis (PB), Persicaria lapathifolia L. (PL), covered about 73, 9, 5, 5, 3% areas among the weed population. However, the CA, PB, PL, MS, was significantly (p<0.05) tougher than DC (bending load: 11.3±4, 3.9±0.8, 2.4±1.7, 1.6±0.4, and 0.3±0.1 N, respectively). The photogrammetry reveals that the crimper was able to reduce the canopy height but weeds fought back to grow substantially (height and VARI at 1st and 10th day since rolling: 0.12±0.05 m and 0.08±0.06; 0.16±0.06 m and 0.16±0.1, respectively). The field data also shows that the ratio of oat and weed dry biomass steadily decreased with time (at 10, 20, and 30th day, followed by the termination is 2.9, 1.3, and 0.8, respectively). For a successful next crop establishment, we recommend a seeding program within 10 days, followed by the termination, since weed may inverse the cash crop productivity.

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