Abstract:

To explore the effect of different nitrogen fertilizer reduction combined with foliar silicon fertilizer on the yield of continuous cropping late rice Huazheyou 261, three different nitrogen fertilizer application rates (N1, pure nitrogen 180 kg·hm^-2, N2, pure nitrogen 162 kg·hm^-2, N3, pure nitrogen 144 kg·hm^-2) and two different silicon fertilizer application rates (S1, foliar spraying with water, S2, foliar spraying with silicon fertilizer 3 000 mL·hm^-2) were designed, and the effects of different nitrogen fertilizer and silicon fertilizer application on the agronomic traits and yield were studied according to the split-plot experimental design. The results showed that under the treatment of nitrogen fertilizer reduction, the grains per panicle, filled grain per panicle and 1 000-grain weight of Huazheyou 261 decreased, and the yield decreased. Compared with the conventional high-yield cultivation mode (N1S1), under the treatment of reducing nitrogen by 10% (N2S1), the yield of Huazheyou 261 decreased by 2.18%; under the treatment of reducing nitrogen by 20% (N3S1), the yield of Huazheyou 261 decreased by 4.21%. The application of foliar silicon fertilizer can increase the yield of Huazheyou 261 and make up the negative effect of nitrogen fertilizer reduction on yield.

Key words: Huazheyou 261, nitrogen fertilizer, silicon fertilizer, agronomic traits, yield