Watermelon and cotton are one of the important cash crops. Some farmers in the production reflected that sometimes there were a few miscellaneous strains in the watermelon seedlings, or the cotton sometimes had low seedlings. These may be related to seed quality. Production should pay attention to the identification of watermelon and cotton false and inferior species.
Seedless watermelon seed authenticity. Seedless watermelon is the main type of watermelon planted in large areas. It is a hybrid of tetraploid watermelon and diploid watermelon (commonly seeded watermelon), ie triploid watermelon. The production of triploid watermelon seeds is often performed by artificial detasseling of tetraploid watermelon. In a few cases, due to incomplete detasseling of tetraploid watermelons in the seed production process, a few seedless watermelon species (triploid watermelon species) are mixed with a small amount of tetraploid watermelons, ie, false seedless watermelon species, and therefore must be Tetraploid watermelons were removed from seedless watermelons. If incomplete removal is possible, seedless watermelon species may still be mixed with tetraploid watermelon species. In some cases, people deliberately mixed tetraploid or diploid watermelon seeds with seedless watermelon seeds. Peasants' friends should pay attention to distinguishing the characteristics of the three types of watermelon seeds. Seedless watermelon seed (triploid seed) embryos are not fully grown, the surface of the seed shell is often sag, the umbilicus part is bulging, and there is deeper corky spline on the seed husk, and the seed is significantly larger than the diploid watermelon. . Tetraploid watermelon seed embryos are enriched and the seeds are round, which is a clear difference from the seedless watermelon seed. In addition, the tetraploid watermelon species often protrudes on the surface of the shells, and there are generally vertical cork splinters on the seed shells, and the umbilicus part has protrusions on the eyes. The seeds of diploid watermelons were significantly smaller than those of seedless watermelons and tetraploid watermelons. The umbilical parts did not protrude from the eyes, the umbilical part was narrow, and there was no longitudinal crack in the seed shell.
Identification of cotton seeds and non-seeds. Cotton seeds are high in germination rate, strong in viability, and beneficial to seedlings after sowing; non-viable seeds have low germination rate and seedling emergence rate, and it is difficult to broadcast whole seedlings. Care should be taken in the production of healthy seeds to eliminate non-viable seeds. Identification of two kinds of cottonseed can be randomly selected from the net seed a small amount of seeds, cut with scissors one by one, according to the color, full degree of identification. The color is fresh, the oil point is obvious, and the seed is full. The color is light brown, dark brown, the oil point is not obvious, and the seed kernels are not healthy seeds. It is also possible to use hot boiled water: extract a small amount of cotton seeds, such as 50 or 100 grains, from the net seeds. Place the seeds in a small cup, scald with boiling water, and stir for 5 minutes. After the cottonseed fluff is soaked, it is taken out and placed in a white porcelain dish, which is identified based on the color difference. Dark brown or dark red are mature seeds; light brown, light red or yellow-white are immature seeds. If there are more non-viable seeds (immature seeds), they cannot be seeded.

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