旱作条件下不同水稻品种的响应特征

水稻旱作正在成为水稻节水栽培的重要途径而在全国逐步得到推广。本文通过田间对比试验，研究了不同水稻品种在水、旱作时的生长与产量表现。结果表明，不同品种水稻在旱作时的生长、形态、生理、产量等均发生分异。旱作后，广陵香粳在生长中后期的根冠比高出相应水作处理的37.1%，两优培九、扬稻4号及对照扬旱1号也保持较高

Responses of Different Cultivars of Rice to Aerobic Cultivation

Aerobic cultivation of paddy rice is becoming a most important way in water saving cultivation of rice and is being extended gradually in China. Field experiments were carried out to study the responses of different cultivars of rice to different water regime systems. The results showed that significant differences of responses in growth situation, morphology, physiology and grain yield to different water regimes were found in different cultivars. The root/shoot ratio of Guanglin Xiangjing under aerobic cultivation condition were 37.1% higher than that under waterlogged condition during the middle and later growth stage, and the ratios of Liangyoupeijiu, Yangdao 4 and Yanghan 1 (upland cultivar as a CK) were also larger during the same growth stage, while the smallest root/shoot ratio, 30.1% less than that of waterlogged treatment was found in Wuyujing 3. Shanyou 63 had a biggest adsorption area of roots and Yanghan 1 and Yangdao 4 in aerobic cultivation had the smallest. The order of relative yields of grain was as follows: Yanghan 1 > Shanyou 63 > Xieyou 63 > Yangdao 4 > 9520 > Wuyujing 3 > Guanglingxiangjing > Liangyoupeijiu ( 96.9%, 76.3%, 74.2%, 61.6%, 49 5%, 43.9%, 43.7% and 43 0% respectively). Better adaptability to aerobic cultivation was found in indicas than japonicas.