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| Effects of different soil tillage practices on biological characteristics and grain yield of rice in double croppingrice field |
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| DOI：10.16768/j.issn.1004-874X.2018.01.001 |
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| Abstract: |
| Soil tillage practices are the key factor affecting soil physical properties in paddy field and grain
yield of rice. Therefore，the variation of plant biological characteristics and grain yield of early rice and late rice
under different soil tillage practices were studied by using field experiments，which providing theoretical for
choose reasonable soil tillage measures to obtain higher grain yield in double-cropping rice area. The biological
characteristics of plant，grain yield of early rice and late rice were analyzed under no–tillage（ NT），moldboard
plowing（ MP），rotary tillage（ RT），RT–NT and RT–MP during early rice and late rice growing season in this
paper. The results showed that the leaf area index of rice were in a trend of MP>RT>RT-NT>RT-MP>NT and
MP>RT-MP>RT>RT-NT>NT at different growth stages of early rice and late rice，respectively. The dry weight of
root，stem，leaves and panicle with MP was significantly higher than that of other treatments at different growth stages
of early rice. And the dry weight of root，stem，leaves and panicle were in a trend of MP ＞ RT ＞ RT-NT ＞ RTMP>
NT at different growth stages of early rice. Meanwhile，the dry weight of root，stem and panicle with MP and RT MP was significantly higher than that of NT at different growth stages of late rice. And the dry weight of root，stem
and panicle were MP ＞ RT-MP ＞ RT-NT>RT ＞ NT at different growth stages of late rice. Compared with NT，
the grain yield of early rice and late rice with MP，RT，RT-NT and RT-MP increased by 681.3，395.9，248.1，
210.0 kg/hm2 and 880.3，495.5，99.1，710.1 kg/hm2，respectively，indicating the dry matter accumulation and grain
yield of early rice and late rice with different soil tillage practices have their own characteristics. Compared with NT，
MP and RT had significantly higher total dry matter accumulation and its reasonable distribution，and improved grain
yield and yield components of rice. |
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