求翻译：本试验以18个东北地区常规早粳稻品种为材料，在赣北地区研究了不同播期对水稻产量及产量构成的影响。结果表明，早熟品种第一播期平均产量显著高于第二播期；中晚熟品种在两个播期的平均产量差异较小；同一播期下中晚熟品种产量和每穗粒数均显著高于早熟品种，而有效穗数却低于早熟品种。表明在赣北地区利用籼改粳作为解决早稻因低温灾害延迟季节，或晚稻苗期因洪涝灾害影响栽插的减灾救灾技术措施时，应优先选用中晚熟粳稻适宜品种，若选用早熟品种应适当早播。是什么意思？

This test as early as 18 Northeast conventional rice varieties of different sowing dates on rice yield and yield material, in the north of Jiangxi region. The results show that the average yield of early maturing varieties of the first broadcast was significantly higher than the second sowing date;

This pilot to 18 in the north-east of conventional rice varieties varieties as early as the material in the north, and research programs in the different intervals for rice production and the impact production. Results indicate that early maturing varieties first aired an average yields significantl

This experiment take 18 northeast area convention early Japonica rice variety as a material, studied in the north of Jiangxi area has broadcast the time differently to the paddy rice output and the output constitution influence.The result indicated that, the precocious variety first broadcasts the t

This test to 18 General early japonica rice varieties in the Northeast as a material, in the North of area studies the effects of different sowing dates on yield and yield components of rice. Results indicate that early maturing varieties average yield significantly higher than the second sowing the

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