不同陆稻品种及其各生育期所需要的有效积温是不同的,早熟品种較晚熟品种为低,各生育期所需积温則依播种早晚而有伸縮。各品种对有效积温的要求有相对的穩定性,这是各品种在不同播种期下生育时期发生变化的主要原因。沈阳地区陆稻最适宜的播种期,早熟品种为四月上旬至五月中旬,晚熟品种为四月上旬至五月上旬。 Different Upland rice varieties and their effective growth temperature required for different growth stages are different. Early-maturing varieties are lower than late-maturing varieties, and the accumulated temperature required during each growth stage is scaled up sooner or later. All varieties of effective accumulated temperature requirements are relatively stable, which is the main reason for the variety of different varieties of sowing period changes. The most suitable sowing date for paddy rice in Shenyang is early maturing varieties from early April to mid-May and late-maturing varieties from early April to early May.