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There are three main types of seeds that are kept by the grain sector: (a) Real seeds, which are botany seeds, such as soybeans, broad beans, red beans, mung beans, cottonseeds, rapeseeds, and sesame seeds. (b) Fruits resembling seeds, which are called fruits in plants, but they are directly used as seeding materials in agricultural production, so they are collectively referred to as seeds such as rice, wheat, barley, oats, rye, corn and sorghum. Undergraduate caripsia and achene such as buckwheat. (3) Vegetative organs, including the natural vegetative organs of rhizome crops, such as the roots of sweet potatoes, the tubers of potatoes, and the stems of cassava. Therefore, most of the custody of the grain sector is "agricultural seeds." It is a broad-based seed, and the seeds of custody are mostly fine varieties. The so-called improved varieties in agriculture have two meanings. On the one hand, they refer to the fine varieties of crops, that is, their genetic characteristics are in line with the requirements of agricultural production. They are early maturing, high yield, good quality, strong resistance, and resistance to storage. On the other hand, it refers to high-quality seeds of crops, such as pure, full, free from impurities and damaged grains, free of pests and diseases, and strong in life. Practice has proved that the two are closely related and are indispensable. Therefore, good varieties must be high-quality seeds of good varieties.
The metabolism of seeds is closely related to temperature. At 1°C to 35°C, the metabolic intensity increases by 2 to 3 times for each increase of 1°C. When storage temperature is. Above 5 °C, a 5 °C increase in temperature will reduce the shelf life of the seeds by half. For example, the time taken for the germination rate of the same batch of soybean seeds (moisture 13.900) to decrease from 9500 to zero is 5 weeks in 30°C, 24 weeks in 20°C, and 120 weeks at 10°C. The portion of the beans that were stored at 0°C still had a germination rate of more than 90% after 10 years. Field planting proved that the yield was similar to that of the new seeds.
The relationship between storage temperature and seed moisture is intricate and should be fully considered in practice. In general, high temperature <300C) and high humidity (water content 1$00) will accelerate seed death; while low temperature and dryness can maintain seeds. Viability. According to the experience of foreign seed storage, wheat seeds can be maintained for 35 years at a temperature of 10°C and 30% relative humidity, and rice seeds can be stored for more than 70 years, and still have a germination rate of 90%.
From the analysis of storage conditions of temperature and seed, the effect of storage environment on seed life is very large, so it is recommended for the construction of seed cold storage. The construction of seed cold reservoirs can be used to reduce the moisture and temperature of seeds as much as possible, so that low temperature, dryness, and no insects are the three major principles for seed storage.
The most basic means of production of agricultural production are non-seeds, generally from the start of sowing to the withdrawal of products, and these products are seeds in most cases. Ensuring and improving the lifespan of seeds The potential for increasing the yield of seeds is an important measure to achieve continuous agricultural output increase, and it is also the responsibility of the Ministry of Agriculture and the grain sector. The construction of seed cold reservoirs embodies these importance.