小画像
发表于 2025-3-28 18:09:28
Seed Formation and Developmentt angio-sperms and most important crop plants. This results in the early fertilization of the polar nuclei to eventually form an endosperm and in the subsequent fertilization of an egg cell to form the embryo.
addition
发表于 2025-3-28 21:02:32
Fundamentals of Seed Production the production and use of the crops for seed, it must be assumed that good farming practices are followed. This chapter describes how agronomic practices relate to seed production in general and the special practices necessary for seed production in particular.
盟军
发表于 2025-3-29 00:53:28
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aptitude
发表于 2025-3-29 04:01:39
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沟通
发表于 2025-3-29 10:42:26
Conditioningre but usually arrives at the cleaning plant containing varying quantities of trash, dried leaves, weeds, crop seeds, and insects. If it contains such materials as green leaves, stems, weeds, and other high-moisture materials, it cannot be safely stored until these contaminants are removed
colony
发表于 2025-3-29 14:52:10
Drying and Storageseed production although other crops are almost always harvested before complete dry-down in the field and must be artificially dried. Because drying technology is important to the preservation of seed quality, a knowledge of the factors that control seed moisture loss must be well understood. Witho
亵渎
发表于 2025-3-29 15:43:08
Seed Quality and Performance products. Although the harvested propagule is the same, unlike grain the seed must be alive and capable of producing a seedling. Seed production is therefore more challenging and rigorous than grain production. High quality seed has many important attributes and benefits that lead to excellent perf
corpuscle
发表于 2025-3-29 19:48:01
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使绝缘
发表于 2025-3-30 00:44:58
Seed Certificationnetic purity and made available to the public. It is a legally recognized program for increasing small quantities of seed of genetically pure varieties into large supplies adequate to meet the demands for planting. Thus, seed certification programs, along with foundation seedstock programs, provide
阻挠
发表于 2025-3-30 04:43:05
Seed Marketings the planting of seeds for crop and food production. Even more basic is the need for production, distribution, and marketing of seeds for home garden use. Thus, the distribution of seeds for both farm and home use constitutes a major marketing effort throughout North America and the world.