Thousand-seed weight is the weight of one thousand seeds expressed in grams. It is an indicator that reflects the size and fullness of seeds. It is used to test seed quality and crop varieties, and is also used when predicting yield in the field. important basis. \r\n(Melons) Cucumber: flat oval, yellow-white, thousand-grain weight 22--42 grams, germination life 4--5 years; Zucchini: flat, gray-white or yellow-brown, thousand-grain weight 150--200 grams, useful life 2 Year; watermelon: flat, with hard seed coat. The size and color of the seeds vary depending on the variety; muskmelon: flat, oval or oblong, yellow-white, thick-skinned seeds are larger, 1,000-grain weight 30-80 grams, thin-skinned melon seeds are smaller , 1000-seed weight is 5-20 grams; bitter melon: slightly thick shield-shaped, yellow-brown, with patterns, each fruit contains 20-30 seeds, 1000-seed weight is 150-180 grams. (Solanaceous fruit) Tomato: flat, kidney-shaped, silver-gray, with hairy surface, 1,000-seed weight 3.0-3.3 grams, germination period 3-4 years; Eggplant: flat, kidney-shaped, yellow, new seeds are shiny, 1,000-seed weight 4-4 years -5 grams, seed life is 4-5 years, service life is 2-3 years; pepper: flat kidney-shaped, slightly wrinkled surface, light yellow, spicy, thousand-grain weight 5.0-6.0 grams. \r\n(Beans) Phaseolus vulgaris: mostly kidney-shaped, with thin seed coat, colors include black, white, red, yellow, brown and piebald, etc., thousand-grain weight 300-700 grams, seed life span 2-3 years, New seeds in the first year are mostly used in production; cowpea: kidney-shaped, each pod contains 16-22 seeds, and the weight of 1,000 seeds is 300-400 grams; peas: pods are dark green or yellow-green, divided into soft pods and hard pods, each pod Contains 2-4 seeds, up to 7-8 seeds. The seeds are round and have a smooth surface, which are round seeds. The seeds which are nearly round and have a shrunken surface are wrinkled seeds. They are green or yellowish white. The weight of a hundred seeds ranges from a few grams. to 40 grams, the seed life is 2-3 years. \r\n (Chinese cabbage) Chinese cabbage: Slightly flat spherical shape, with longitudinal concave lines, reddish-brown or brown, a few yellow, no endosperm, 1,000-grain weight 2-4 grams, service life 1-2 years; cabbage: The fruit is a silique with seeds arranged on both sides of the diaphragm. Each silique has about 20 seeds. The seeds are reddish brown or dark brown. The weight of one thousand seeds is 3.3-4.5 grams. The service life is 2-3 years. Cauliflower: The fruit is a silique with more than 10 seeds. The seeds are spherical, purple-brown, and weigh 2.5-4.0 grams per thousand seeds. \r\n(Onion and garlic) Leek: The fruit is a capsule with three chambers, each chamber contains two seeds. The mature seeds are black, with fine wrinkles on the surface, convex on the back, and sunken ventral surface. The weight of a thousand seeds is about 4 grams; green onions : Shield-shaped, ribbed on the inside, black, hard, impermeable seed coat, 1,000-kernel weight 2.4-3.4 grams; Onion: shield-shaped, triangular cross-section, hard and wrinkled outer skin, black, 1,000-kernel weight 3-4 grams, service life 1- -2 years. \r\n (Green leafy vegetables) Celery: double-hanging fruit, the seeds are actually fruits, oval, small, dark brown, with strong fragrance, 1,000-grain weight is about 0.47 grams; Spinach: leathery peel, silver gray;\r \n(Root vegetables) Radish: Irregular spherical shape, light yellow to dark brown seed coat, thousand-grain weight 7-15 grams, germination period 5 years; Carrot: double-hanging fruit, flat oval, yellowish brown, leathery, containing volatile oil , not easy to absorb water and has a special aroma.