分蘖期淹水对常规粳稻生长特性、产量形成与钾素吸收的影响.

陈宇眺; 闫川; 洪晓富; 宋佳谕

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 K2O. 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 japonica 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.

WATER levels; GRAIN yields; FERTILIZER application; POTASSIUM; SURVIVAL rate

Acta Agriculturae Zhejiangensis, 2024, Vol 36, Issue 9, p1990

1004-1524

Academic Journal

10.3969/j.issn.1004-1524.20231009