农业试验小区是选育良种、改进栽培技术、进行品种对比试验的基地。
Agricultural experiment plot became the base for breeding improved varieties, improved culture technology and variety comparative test.
由于使用更好的化肥、选育良种、机械化程度提高，农产品的生产成本已经大幅下降。
Costs of production have been substantially lowered for farm products by better application of chemical fertilizer, improved strains of seed and increasing mechanization.
已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。
Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.
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