Faba bean varieties are prone to genetic variation and degradation when planted continuously. Although faba beans are primarily self-pollinated, pollination by bees and other insects can lead to an outcrossing rate of 20% to 30%, making them a cross-pollinated crop. As a result, the genetic diversity of faba beans changes rapidly over time. If high-quality seeds are not properly selected and maintained for at least three years, they may lose their value in agricultural production. Therefore, it is essential to conduct annual selection, purification, and rejuvenation of seeds to maintain the purity and desirable traits of the variety.
To ensure seed purity, planting areas should be isolated spatially, especially around hills where different varieties are grown. If multiple varieties are present nearby, each variety should be planted at least 300 to 500 meters apart to reduce the risk of cross-pollination. If isolation is not possible, barrier isolation methods can be used, such as planting tall crops like corn or rapeseed between different varieties. This helps prevent unwanted genetic mixing.
The yield of selected faba beans depends on four key factors: the number of effective branches per plant, the number of pods per plant, the number of grains per pod, and the weight of individual grains. When selecting plants, farmers should prioritize those that are disease-free, have strong branching, and show good growth. Typically, 400 to 500 healthy plants per mu (about 667 square meters) should be chosen for seed production. After selecting these plants, the lower parts are removed, and only the middle and upper sections with full, well-filled pods containing at least two grains are retained.
From the selected pods, individual grains are carefully picked and evaluated. Seeds must be mature, plump, free from blemishes, worm damage, and have the correct color and shape typical of the variety. If multiple varieties are being preserved, clear labeling during selection, storage, and handling is crucial to avoid confusion.
In addition to genetic variation due to cross-pollination, seed purity can also be compromised during harvesting, threshing, and transport if different varieties are mixed. To preserve the quality of a superior variety, strict measures must be taken to prevent contamination. Each variety should be harvested, dried, stored, and processed separately to maintain its integrity and performance in future plantings.
Potassium Fluoride CAS No.7789-23-3
Potassium Fluoride Basic Information
Product Name: Potassium fluoride
CAS: 7789-23-3
MF: FK
MW: 58.1
EINECS: 232-151-5
Mol File: 7789-23-3.mol
Potassium Fluoride Chemical Properties
Melting point: 858 °C(lit.)
Boiling point: 1505 °C
Density: 2.48
Vapor pressure: 1.3 hPa (885 °C)
Fp: 1505°C
Storage temp.: Store at RT.
Solubility H2O: 1 M at 20 °C, clear, colorless
Form: spray-dried
Color: White
Specific Gravity: 2.481
PH: 7.0-8.5 (25℃, 1M in H2O)
Water Solubility: 92.3 g/100 mL (18 ºC)
Sensitive: Hygroscopic
Potassium Fluoride,Potassium Fluoride Hydrolysis,Potassium Fluoride Phase,Potassium Fluoride Phase
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