一切經过試驗,这是农业技术推广和技术指导工作的重要原則。农业生产是在錯綜复杂的外界条件下进行的。各地的气候、土壤、耕作技术和經济条件差别很大,在这个地区、这个条件下适用的农业技术措施,在別的地区、別的条件下,就可能是不适用的,或者是不完全适用的。因此,一切农业技术措施,都必須在各个地区 After all tests, this is an important principle of agricultural technology promotion and technical guidance. Agricultural production is carried out in complex external conditions. The climate, soil, farming techniques and economic conditions vary widely across the regions, and agricultural technologies applied under this condition may not be applicable or may not be fully applicable in other regions and conditions of. Therefore, all agricultural technical measures must be in all regions