再生稻佳辐占低桩机割再生分蘖节根的萌发特性

为探索低桩机割再生稻高产途径,研究了水稻品种佳辐占再生分蘖节根的萌发特性.结果表明:头季低桩机割后再生季成穗分蘖为倒4、倒5节分蘖及其子蘖;倒4、倒5节分蘖有4个发根节,子蘖有3个发根节,每节萌发5~8条节根.各节节根萌发有恒定叶龄期:当第n节叶片开始伸长时,第n-3节节根开始萌发(节根原基突破茎秆表皮);当第n节叶片刚抽出时(该叶伸长近半),第n-3节少数节根显著伸长;当第n节叶片抽出70%时(该叶定长),第n-3节节根萌发数稳定.倒4、倒5节分蘖在头季机割后约10d,子蘖在头季机割后约20d,开始从前出叶节萌发节根,至孕穗初始期前后最上一节节根结束萌发,抽穗后不久全部侧根结束萌发.上述结果可为调控再生稻根系发育提供科学依据.福建省科技厅省属公益类专项(2015R1021-9);;福建省农业科学院青年创新团队项目(STIT2017-3-3);;国际原子能机构合作项目(CRP17031

Preliminary Study on Nitrogen Fertilizer Application of Ratoon Rice Cultivar Jiafuzhan

为提高再生稻‘佳辐占’的再生季产量,设置施氮量试验。结果明确,再生季产量与施氮量呈抛物线型相关。在供试条件下,适宜的施氮量为138kg·HM-2,其分蘖萌发率显著提高,再生季穗数达到头季穗数的2.4倍,再生季产量达到接近头季产量的水平,经济效益也最佳。Different nitrogen application ratio in the second crop of ratoon rice for good quality cultivar Jiafuzhan were studied in order to increase grain yield at Jianyang City of Fujian Province.The results showed that grain yield in the second crop exhibited a parabolic curve relationship with nitrogen application ratio.In the experimental conditions,the suitable nitrogen application ratio was 138kg·hm-2,which significantly enhanced the rate of axillary bud germination.Therefore,panicle number in the second crop was 140% higher than that in the first crop,and its grain yield also nearly reached the level of the first crop.The economic benefit was the best among all treatments.国家科技支撑计划子课题(2011BAD16B14); 福建省现代农业水稻技术体系建设(闽财指[2009]528号); 福建省财政专项——福建省农业科学院科技创新团队项目(CXTD-1-1301); 国际原子能机构(IAEA)项目(CRP17031;CRP17031/R0