DOI: 10.3724/SP.J.1006.2019.82030

Acta Agronomica Sinica (作物学报) 2019/45:5 PP.740-754

Effects of different soil tillage systems on physiological characteristics and yield of double-cropping rice

In order to explore the effects of different soil tillage systems on physiological characteristics, dry matter accumulation and grain yield, a fixed location field experiment was conducted using early and late double-cropping rice and Chinese milk vetch (Astragalus sinicus L.) system with four soil tillage treatments including conventional tillage with residue incorporation (CT), rotary tillage with residue incorporation (RT), no-tillage with residue retention (NT), and rotary tillage with residue removed as control (RTO) from 2016 to 2017. The activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in leaves of CT, RT treatments were increased as compared with those of RTO treatment at different main growth stages of early and late rice. Meanwhile, malondialdehyde (MDA) contents in leaves of CT and RT treatments were decreased. At different main growth stages of early and late rice, the activities of SOD, POD, and CAT in leaves of CT and RT treatments were significantly higher than those of RTO treatment (P<0.05), while MDA contents of CT and RT treatments were significantly lower than those of RTO treatment (P<0.05). Meanwhile, the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) in leaves of CT treatment were significantly higher than those of RTO treatment (P < 0.05), showing an order of CT > RT > NT > RTO. The results also indicated that the total dry matter accumulation of early and late rice were increased, and its reasonable distribution of rice plant in CT and RT treatments. In 2016 and 2017, the grain yield of early and late rice in CT treatment was significantly higher than that in RTO treatment (P<0.05), with an increase of 731.1-733.3 kg ha-1 and 582.5-717.6 kg ha-1, respectively. As a result, it is an effective way for improving protective enzyme activities and photosynthetic characteristics in leaves, dry matter accumulation of rice by conventional tillage and rotational tillage combined with residue incorporation practices, which results in higher grain yield of rice.

Key words:rice,soil tillage,physiological characteristics,protective enzyme,rice yield

ReleaseDate:2019-11-05 15:30:02

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