	US 12,349,670 B1
	Method for reducing seed production of barnyard grass in paddy fields
Bo Liu, Changchun (CN); Ming Jiang, Changchun (CN); Haitao Wu, Changchun (CN); Yuanchun Zou, Changchun (CN); Wenguang Zhang, Changchun (CN); Luyao Wang, Changchun (CN); Yuan Pan, Changchun (CN); and Xudong Zhang, Changchun (CN)
Assigned to Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun (CN)
Filed by Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun (CN)
Filed on Nov. 12, 2024, as Appl. No. 18/944,614.
Claims priority of application No. 202410444238.7 (CN), filed on Apr. 15, 2024.
Int. Cl. A01M 21/02 (2006.01); A01G 22/22 (2018.01)

CPC A01M 21/02 (2013.01) [A01G 22/22 (2018.02)]

6 Claims

1. A method for reducing seed production of barnyard grass in paddy fields, wherein steps of the method for reducing the seed production of the barnyard grass in the paddy fields are as following:

I: selecting plots: selecting plots planted with rice and are seriously damaged by barnyard grass as treatment objects;

II: monitoring plant height: after rice transplanting for 1-2 months, monitoring plant heights of rice and barnyard grass, randomly selecting 3-10 plants in a small quadrat of 2 m², vertically measuring a height from a ground to tops of the plants, taking an average of 3-10 plants, and calculating a height difference between barnyard grass and rice;

III: observing seeds: observing the seeds on barnyard grass ears in terms of development, collecting seeds of a whole ear, removing impurities and air drying, then measuring a seed viability by a germination method, wherein seeds are considered viable if germinated, and calculating a proportion of viable seeds, and ensuring that little or no seed is shed on the ear prior to implementing a step IV;

IV: mowing barnyard grass: when an average height of barnyard grass is 3 centimeters greater than rice, cutting off all barnyard grass plants on a premise of not destroying rice plants;

V: utilizing barnyard grass: repeating the step IV for 3-6 times, and taking all barnyard grass materials cut out of the plots for making silage or directly feeding, preventing weed seeds from entering a farmland again; and

VI: measuring a seed yield: when few barnyard grass plants grow taller than rice for 7 consecutive days, determining a yield of barnyard grass seeds per unit area after treatment of a step V, and completing a reduction of seed production of the barnyard grass in paddy fields.