| 施氮量和栽插密度对抛秧晚稻穗颈瘟的影响 |
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| 引用本文： | 程凯凯,李 超,唐海明,汤文光,汪 柯,肖小平.施氮量和栽插密度对抛秧晚稻穗颈瘟的影响[J].中国农学通报,2016,32(30):157-162. |
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| 作者姓名： | 程凯凯 李 超 唐海明 汤文光 汪 柯 肖小平 |
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| 作者单位： | 中南大学研究生院隆平分院,湖南省土壤肥料研究所,湖南省土壤肥料研究所,湖南省土壤肥料研究所,湖南省土壤肥料研究所,中南大学研究生院隆平分院 |
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| 基金项目： | 中南大学硕士生自主创新项目“不同种植模式对双季稻田土壤有机碳积累的影响”(2016zzts587)；公益性行业（农业）科研专项“湖南双季稻三熟区耕地培肥与合理农作制构建集成研究与示范”(201503123)。 |
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| 摘 要： | 穗颈瘟是湖南晚稻的主要病害之一,本研究通过氮肥用量与抛秧密度互作,研究其对晚稻穗颈瘟发生的影响,以期从栽培角度为晚稻穗颈瘟的防治提供理论支撑。试验设置4个氮肥用量(N0、N1、N2、N3)与3个抛秧密度(D1、D2、D3)。结果表明:在相同氮肥条件下,各发病参数随密度的增加均呈"凹"形趋势,而在同一密度条件下,各发病参数伴随施氮量的增加而增加。处理(N3D1)穗颈瘟发生最严重,其病穗率、病蔸率、病情指数分别为10.76%、69.56%、12.65%。SPAD值与病穗率、病蔸率、病情指数之间的相关系数R2分别为0.7294、0.8325、0.746,达显著水平。单穴叶面积与病穗率、病蔸率、病情指数之间的相关系数R2分别为0.8259、0.8481、0.8407,均达极显著水平。施用氮肥为180 kg/hm~2、栽植密度为26.25万兜/hm~2时,既有利于促进晚稻生长,还可减少穗颈瘟的发生。
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| 关 键 词： | 晚稻 施氮量 栽插密度 穗颈瘟 |
| 收稿时间： | 2016/3/15 0:00:00 |
| 修稿时间： | 2016/10/13 0:00:00 |
Nitrogen Application and Planting Density Affecting PanicleBlast of Seedling-Throwing Late Rice |
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| Cheng Kaikai,Li Chao,Tang Haiming,Tang Wenguang,Wang Ke and Xiao Xiaoping.Nitrogen Application and Planting Density Affecting PanicleBlast of Seedling-Throwing Late Rice[J].Chinese Agricultural Science Bulletin,2016,32(30):157-162. |
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| Authors: | Cheng Kaikai Li Chao Tang Haiming Tang Wenguang Wang Ke and Xiao Xiaoping |
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| Institution: | Longping Branch of Graduate School, Central South University,Hunan Institute of Soil and Fertilizer,Hunan Institute of Soil and Fertilizer,Hunan Institute of Soil and Fertilizer,Hunan Institute of Soil and Fertilizer,Longping Branch of Graduate School, Central South University |
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| Abstract: | Panicle blast is one of the main types of late rice diseases in Hunan Province. The interaction of nitrogen application amount and seedling-throwing density was used in this research to study the influence on late rice panicle blast, and provide theoretical support for rice panicle blast control from the perspective of cultivation. This study set up four nitrogen levels (N1, N2, N3, N4) and three seedling-throwing densities (D1, D2, D3). The results showed that every disease development parameter presented a concave trend with density increase under the same nitrogen level, and an increasing trend was found with nitrogen increase under the same density. The disease development under N3D1 treatment reached the highest level, and the rate of disease panicles, disease plants, and disease index was 10.76%, 69.56%, 12.65%, respectively. The correlation coefficients R2 of SPAD value with the rate of disease panicles, disease plants, disease index were 0.7294, 0.8325 and 0.746, respectively, all reached significant level. The correlation coefficients R2 between leaf area per plant and the rate of disease panicles, disease plants, disease index were 0.8259, 0.8481 and 0.8407, respectively, and all reached significant level extremely. Nitrogen application of 180 kg/hm2 and planting density of 262500 holes/hm2 could promote the growth of late rice, and also reduce panicle blast. |
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| Keywords: | late rice nitrogen application planting density panicle blast |
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