不同灌溉方式对水稻生长与产量的影响

研究了汕优10号、923、珍汕97B3种不同水稻品种在常规淹灌、间歇灌溉和旱种3种灌溉方式下的生长、产量及生理变化。结果表明，汕优10号与923两品种在间歇灌溉条件下获得最高产量，而珍汕97B的产量则是淹灌处理的最高；3个品种的最低产量均出现在旱种处理。生理研究的结果表明，与常规淹灌相比，汕优10号与923两品种的间歇灌溉处理水稻根系活力及叶绿素含量提高，氮素吸收及利用率增强，后期干物质积累量较高，产量和水分利用效率显著提高；旱种处理虽根系活力及叶绿素含量也有显著提高，但其氮素吸收与利用受到严重影响，后期干物质积累量较小，颖花形成能力及有效穗数较低，导致产量显著下降。3品种以杂交稻汕优10号抗旱性最强。

Effects of Irrigation Patterns on Growth and Yield of Rice Varieties

Concrete pool experiment with three varieties under flooded, intermittent irrigation and dry cultivation were conducted. The intermittent irrigation treatment gave highest yields in San -you no. 10 and No. 923, while the highest yield of Zen - san 97B was realized in flooded treatment. The dry cultivation treatment gave the lowest yield of all the three varieties. In the intermittent irrigation treatments of San - you no. 10 and No.923, root activity, leaf chlorophyll content, N absorption, dry matter accumulation at the late growth stage, yield and water use efficiency were higher than those of flooded irrigation treatment. In the dry - cultivation, root activity and leaf chlorophyll content were also increased, but N absorption, dry matter accumulation at the late growth stage, total spikelets, effective tillers and hence the yield were much lower than those flooded irrigation. San - you no. 10 has the strongest drought - resistence.