有机栽培条件下不同机械种植方式对香稻产量、品质以及香气的影响

可持续发展农业和有机栽培越来越受到人们的关注。以常规香稻品种19香为试验材料,研究了有机栽培条件下不同机械种植方式（DD,旱插秧机旱插秧;DW,水插秧机旱插秧;D,机械旱直播;CK,常规水插秧）对香稻品种产量、品质及香气的影响。结果表明,与CK相比,DD处理水稻有效穗数、每穗粒数、结实率、千粒重和产量均无明显差异,D处理水稻产量显著下降;DD、DW和D处理的水稻香气合成关键基因BADH2表达受到抑制,从而明显提高了稻米香气,其中,DD处理香气物质（2-乙酰-1-吡咯啉）含量最高。综上所述,旱插秧机旱插秧适宜作为有机栽培条件下机械种植方式。

Effects of Different Mechanical Planting Methods on Yield,Quality and Aroma of Fragrant Rice under Organic Cultivation Conditions

Sustainable development agriculture and organic cultivation get more and more attention. The effects of different mechanical planting methods on the yield, quality and aroma of the conventional fragrant rice variety 19 Xiang under the organic cultivation conditions were studied. In this experiment, four treatments were set up, namely mechanical transplanting with dry transplanter （DD）, mechanical transplanting with water transplanter （DW）, mechanical dry direct seeding （D）, conventional water transplanting method as the control （CK）. The results showed that, there was no significant difference in effective panicle number, grains per panicle, seed-setting rate, 1000-grain weight and yield between DD treatment and CK, while the yield under D treatment decreased significantly. Compared with CK, DD, DW and D treatments significantly inhibited the expression of BADH2,a key inhibit gene of rice aroma synthesis, thereby enhancing rice aroma, with the highest content of aroma substance （2-acetyl-1-pyrroline） under DD treatment. In conclusion, the mechanical transplanting with dry transplanter is suitable as a mechanical planting method under organic cultivation conditions.