Abstract:

Rice seedling blight is a common fungal disease in rice seedling raising, especially in dry rice-nursery. In this experiment, the authors investigated the initial rate of seedling emergence, the first infection time of rice seedling blight, and the proportion of subsequent disease under the treatments with different biological organic amounts and different sowing density, using Nei 10 you 7185 as material. The results showed that, applying organic fertilizer would reduce the initial emergence rate, delay the infection time and inhibit the occurrence of rice seedling blight at seedling stage, the effect was obvious when the dosage is above 2 kg/m2; the larger sowing density was beneficial to the emergence of the seedlings; however, the higher the sowing density, the earlier the infection time of rice seedling blight, the more serious the damage caused by Fusarium verticillioide. Therefore, for Nei 10 you 7185, the appropriate sowing density is 30 g/m2 and the application amount of bio-organic fertilizer is 2 kg/m2.

Key words: rice seedling blight, biological organic fertilizer, seeding density

摘要：

立枯病是水稻育秧过程中常见的真菌性病害，在旱育秧中尤其容易发生。以内10优7185为材料，设置不同生物有机肥施肥量和不同播种密度处理，调查了不同处理下旱育秧的初始出苗率、立枯病的初始发病时间及后续发病情况。结果表明，施用生物有机肥会降低初始出苗率，延迟立枯病初始感病时间，抑制水稻苗期立枯病害的发生，施用量为2 kg/m2时效果明显；播种密度大有利出苗，但密度越大立枯病初始感病时间越早，立枯病菌的为害越严重。可见，内10优7185适宜的播种密度为30 g/m2、生物有机肥施用量为2 kg/m2，对旱育秧出苗有利，且对立枯病的发生抑制效果明显。

关键词: 水稻立枯病, 生物有机肥, 播种密度