作物学报 ›› 2014, Vol. 40 ›› Issue (05): 899-907.doi: 10.3724/SP.J.1006.2014.00899
曾勇军,周庆红,吕伟生,谭雪明,潘晓华,石庆华*
ZENG Yong-Jun,ZHOU Qing-Hong,LÜ Wei-Sheng,TAN Xue-Ming,PAN Xiao-Hua,SHI Qing-Hua *
摘要:
土壤pH是影响水稻生长的重要因素,目前还不清楚土壤酸化对双季水稻产量的影响。本研究利用硫酸调节土壤pH结合移栽后浇灌不同pH的水使土壤酸化。结果表明,随着土壤pH的下降,双季早、晚稻生育期延长,物质生产量下降,产量降低,当浇灌水pH下降至4.5以下,土壤pH下降至5.0以下时,双季早、晚稻产量下降明显,其中早稻平均下降7.82%,晚稻平均下降8.06%;当浇灌水pH下降至3.5以下,土壤pH下降至4.5以下时,双季早、晚稻产量下降幅度更大。土壤酸化主要抑制双季早、晚稻前期分蘖的发生,导致每穗粒数降低,结实率和千粒重也表现出下降的趋势。
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