Collection, storage and handling of plant genetic resources and their global distribution are essential components of international crop and tree improvement programmes.
植物遗传资源的收集、存储和处理以及它们在全球的分布，是国际作物和树木改良计划的重要成分。
A quarter of the crop may be lost in storage.
收获的四分之一可能损失在贮藏过程中。
The storage and the usable amount of soil water resource vary with the situations of meteorology, irrigation and crop growing.
土壤水储存量和土壤水可利用量随气象条件、灌溉以及作物状况不断变化；
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