1997年以舟 90 3为材料 ,进行了直播早稻覆膜旱作不同施肥量及密度试验 ,结果表明 :覆膜旱作具有明显的增温作用 ,从而能提早出苗和缩短全生育期 ;节肥效果明显 ,直播早稻覆膜旱作可比常规水作法节省氮肥 50 % ,且产量相当 ,施用常规水作法 70 %的氮肥 ,则有显著的增产效果。其适宜密度为 2 0× 2 0 (cm)。 In 1997, Zhou903 was used as material to test the effects of different fertilization rates and density on direct seeding rice in early rice cultivation. The results showed that the plastic film mulching had obvious warming effect, which could prematurely seed and shorten the whole growth period. The effect is obvious. Direct-seeded early rice has the advantage of saving 50% of nitrogen fertilizer compared with the conventional water-saving cultivation method and has the same yield. The nitrogen fertilizer with 70% of the conventional water method has significant yield increase effect. The appropriate density of 20 × 20 (cm).