不同头季施氮水平下菌根共生稻的再生能力与产量形成特征

Regeneration Capacity and Yield Formation Characteristics of Mycorrhizal Symbiotic Rice Under Different First-season Nitrogen Application Levels

以赣菌稻1号(菌根共生稻品种)和中早35(受体水稻品种)为材料,设置3个施氮水平(N1112.5 kg/hm^(2)、N2135.0 kg/hm^(2)、N3150.0 kg/hm^(2)),比较不同头季施氮量下菌根共生稻与其受体品种的再生能力和产量形成特征差异。结果表明,与中早35相比,赣菌稻1号在不同施氮处理下的根系伤流量和再生力均处于更高水平,尤其在常规施氮处理(N3)下,赣菌稻1号的根系伤流量和再生力分别比中早35高17.30%和8.31%;头季稻中,赣菌稻1号N1、N2、N3处理下的干物质量较中早35分别高6.33%、5.67%、5.75%,再生季分别高25.21%、19.43%、12.11%;赣菌稻1号N1、N2、N3处理的头季稻产量较中早35分别高2.81%、3.07%、5.28%,再生季分别高14.64%、19.62%、14.97%。综上可知,在头季高氮条件下,菌根高效共生水稻品种根系活力强,能够促进水稻对营养物质的吸收,保障地上部干物质量的积累和有效穗数的增加,提高水稻的产量和再生力,特别是再生季,菌根共生稻的生长和产量优势愈加明显。

Using Ganjundao 1(mycorrhizal symbiotic rice variety)and Zhongzao 35(recipient rice variety)as the materials,three nitrogen application levels(N1112.5 kg/hm^(2),N2135.0 kg/hm^(2) and N3150.0 kg/hm^(2))were set to compare the regeneration capacity and yield formation characteristics between the mycorrhizal symbiotic rice and its recipient rice variety under different first-season nitrogen application treatments.The results showed that compared with Zhongzao 35,the root bleeding rate and regeneration capacity of Ganjundao 1 under different nitrogen application treatments were higher,especially under the conventional nitrogen application treatment(N3),the root bleeding rate and regeneration capacity of Ganjundao 1 were 17.30%and 8.31%higher than those of Zhongzao 35,respectively.In the first season,the dry matter weight of Ganjundao 1 under N1,N2 and N3 treatments was 6.33%,5.67%and 5.75%higher than that of Zhongzao 35,respectively,while in the ratooning season,the dry matter weight of Ganjundao 1 was 25.21%,19.43%and 12.11%higher than that of Zhongzao 35,respectively.Under the treatments of N1,N2 and N3,the first season rice yield of Ganjundao 1 was 2.81%,3.07%and 5.28%higher than that of Zhongzao 35,respectively,while in the ratooning season,the yield of Ganjundao 1 was 14.64%,19.62%and 14.97%higher than that of Zhongzao 35,respectively.In conclusion,under the conditions of higher nitrogen levels in the first season,the high-efficient mycorrhizal symbiotic rice had stronger root activity,which could promote the absorption of nutrients,ensure the accumulation of above-ground dry matter and the increase of effective panicles,and improve the yield and regeneration capacity of rice.Especially,in the ratooning season,the growth and yield advantages of mycorrhizal symbiotic rice were more obvious.