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The pull force is exerted on a position of 440 mm above the ground and close to the fourth internode of the corn stalk. (a) The prototype of the measurement device applied in the field experiment of corn stalk lodging under the action of pull force F; (b) the original pull force F fluctuated significantly with a CV of 39.1% along with stalk lodging angles ranging from 0° to 45°, while the equivalent force was much more stable (CV of 4.85%).
