ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (3): 147-154. doi: 10.7668/hbnxb.201751069

Special Issue: Rice Drought and water saving

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Effects of Different Planting Modes on Nitrogen Uptake and Accumulation of Late Rice under Water-saving Conditions

ZHOU Wentao, LONG Wenfei, DAI Wei, FU Zhiqiang   

  1. College of Agriculture, Hunan Agricultural University, Central China Crop Cultivation Observatory and Experiment Station, Ministry of Agriculture, Changsha 410128, China
  • Received:2018-12-03 Published:2019-06-28

Abstract: In order to investigate the effects of different rice planting modes on the nitrogen utilization of double-cropping late rice under the water-saving condition of "early water and late use", three planting modes of artificial transplanting, throwing seedlings and transplanting seedlings by machine were compared. The results showed that nitrogen accumulation per plant increased gradually with time during the main growing stages of rice. Nitrogen accumulation per plant in different stages of rice accounted for the proportion of total nitrogen accumulation in the whole growth stages showed the following order (from high to low):tillering to full heading stage (25.18%-68.01%), sowing to tillering stage (23.47%-58.47%), milky to maturity stage (5.39%-27.25%),full heading to milky stage (0.52%-12.51%). The accumulation amounts of nitrogen per plant followed the order of tillering to full heading stage (148.28* *),milky to maturity stage (105.05* *), sowing to tillering stage (71.65* *), and full heading to milky stage (57.26* *). The nitrogen accumulation as a proportion of total plant biomass in stem sheaths and leaves of rice decreased with the growth of rice as a whole, while the nitrogen accumulation increased first and then decreased, reaching to maximum at heading stage. Nitrogen accumulation as a proportion of total plant biomass in panicle increased first and then decreased with the growth of rice, and nitrogen accumulation increased gradually. There was a significant positive correlation between yield and nitrogen accumulation per plant during the milky stage(0.87*), but no significant correlation was founded during tillering to full heading stage and full heading to milky stage. There was no significant negative correlation between yield and nitrogen accumulation as a proportion of total plant biomass in maturity stage. Among different treatments, the nitrogen accumulation of rice and the nitrogen accumulation as a proportion of total plant biomass of leaves,stem sheaths and panicle was the highest in the treatment of "The early rice ploughs were planted and reaped+Late rice harvest by no-tillage and throwing machine+seedling-increase and nitrogen-reduction" in the maturity stage.

Key words: Rice, Water saving, Planting methods, Nitrogen, Absorption and utilization

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Cite this article

ZHOU Wentao, LONG Wenfei, DAI Wei, FU Zhiqiang. Effects of Different Planting Modes on Nitrogen Uptake and Accumulation of Late Rice under Water-saving Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(3): 147-154. doi: 10.7668/hbnxb.201751069.

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