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Vermicompost is an organic fertilizer with high microbiological activity. However, the application of vermicompost in fragrant rice production and the effects of vermicompost rates on fragrant rice performances have not been reported. The present study conducted a field experiment with two cropping lugs to investigate the agronomic performances of fragrant rice cultivars under different vermicompost rates. Five vermicompost rates, i.e., 2.250 (Ver1), 3.000 (Ver2), 3.750 (Ver3), 4.8750 (Ver4), and 6.000 (Ver5) t ha−1, were adopted and a treatment without any fertilizer applied was taken as control (CK). The results showed that the application of vermicompost significantly increased the grain yield of fragrant rice, while the highest or equally highest yield was recorded in the Ver2 treatment. Similar trends were observed in dry matter weight at 80 and 100 days after transplanting. However, the vermicompost didn’t have remarkable effects on chlorophyll content and grain 2-acetyl-1-pyrroline (the key component of fragrant rice aroma) content. The effects of different vermicompost rates on grain quality characters were unstable and irregular across the cropping lugs, although Ver1 and Ver2 treatment exhibited relatively good grain quality with lower amylose content and higher protein content. In the present study, the recommended amount of vermicompost was 3.0 t ha−1 in fragrant rice production.

Agronomic Performances of Fragrant Rice Cultivars under Different Vermicompost Rates