摘要
为研究分蘖期淹水胁迫对常规粳稻生长特性、产量、产量构成因子、钾素吸收与钾肥利用率的影响,阐明钾素对常规粳稻分蘖期耐淹性的调控作用,以常规粳稻浙粳99为供试材料开展盆栽试验,设置CK(不淹水,对照)和ST(分蘖期用43 cm水层淹水15 d)2个主处理,在主处理下进一步设置K0(不施钾)和K180(K2O施用量180 kg·hm^(-2))2个钾肥处理。结果显示,相比于对照组,淹水组2个钾肥处理的平均存活率、单位面积有效穗数、单位面积颖花数分别显著(P<0.05)下降16.8百分点、71.1%和68.0%,退水后1 d和成熟期的植株钾素积累量分别显著下降53.8%和44.6%,淹水期间和退水后的钾素积累速率分别显著下降66.7%和45.0%,但植株钾含量、钾肥偏生产力、钾肥回收利用率、钾素收获指数无显著变化。结果表明,分蘖期淹水胁迫显著抑制常规粳稻的正常生长,但在本试验条件下对水稻产量和钾肥利用无显著不利影响,增施钾肥对提高常规粳稻分蘖期的耐淹性有一定的促进作用。
In order to investigate the effects of the submergence stress at the tillering stage on the growth characters,grain yield,yield components,potassium uptake and use efficiency on japonica inbred rice and clarify the effects of potassium fertilizer on the submergence tolerance at tillering stage,a pot experiment was carried out with the japonica inbred rice variety Zhegeng99.Two main treatments were set:CK(control),not submerged;ST,submerged at the tillering stage for 15 d with the water level of 43 cm.Under each main treatment,two potassium treatments were set:K0,without application of potassium;K180,application of 180 kg·hm^(-2) K 2O.The results indicated that compared with the CK,the mean value of plant survival rate,effective panicle number and the spikelets number per unit area of the two potassium treatments under ST treatment were significantly(P<0.05)decreased by 16.8 percentage points,71.1%and 68.0%,respectively;the mean value of potassium accumulaition at one day after de-submergence and the maturity stage under ST treatment was significantly decreased by 53.8%and 44.6%,respectively;and the mean value of potassium accumulation rate during the submergence and after de-submergence was significantly decreased by 66.7%and 45.0%,respectively.However,there was no significant difference in the potassium content,partical factor productivity of potassium fertilizer,potassium recovery use efficiency and potassium harvest index between the two main treatments.The results indicated that the submergence at the tillering stage could cause significant damage to the normal growth of japonic a inbred rice,but it had no significant adverse effect on the rice yield and potassium utilization under the experiement conditions.Application of potassium fertilizer could help enhance the tolerance of japonica inbred rice to the submergence stress at the tillering stage.
作者
陈宇眺
闫川
洪晓富
宋佳谕
CHEN Yutiao;YAN Chuan;HONG Xiaofu;SONG Jiayu*(Institute of Crops and Nuclear Technology Utilization,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)
出处
《浙江农业学报》
CSCD
北大核心
2024年第9期1990-1999,共10页
Acta Agriculturae Zhejiangensis
基金
国家自然科学基金(31701364)
东北粳稻遗传改良与优质高效生产省部共建协同创新中心
浙江省数字旱粮重点试验室(2022E10012)。
关键词
淹水胁迫
常规粳稻
钾肥利用率
产量构成
生长特性
submergence stress
japonica inbred rice
potassium use efficiency
yield component
growth character
