关键词: 水稻立枯病, 生物有机肥, 播种密度

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