Abstract: In order to explore the effect of combination of the rice direct sowing in simplified cultivation and the integrated rice-duck farming technology on the rice root growth character. In this regard, this paper drew lessons from the previous researches on rice direct sowing and rice-duck farming, and proposed the idea of cropping and farming technology, which meant raising the ducks under rice direct sowing. A field comparison experiment was carried out, which involved the regular rice direct sowing(CK), regular duck raising under rice direct sowing(RD), duck raising under semi-solid rice direct sowing(RDS) and duck raising under precision hill-direct-sowing(RDP) to explore the growth properties of the plant root system. The results showed that there were differences in such root properties as the root number per plant, root length and the root volume among different treatments. The RDP treatment had larger root number per plant, root length and the root volume than the RDS, RD and the CK treatments, while these properties in the late three treatments were basically the same. Compared with the CK treatment, RDP saw stronger activity of the roots from the five-leaf stage to the full heading stage, increasing by a largest 7.49% at the heading stage of the early rice, but the average increase didn't reach a significant difference. The activity of the roots in the RDS, RD and the CK treatments was insignificantly different. In addition, compared with the CK treatment, the RDP treatment saw larger total absorbing area and active absorbing area of the roots. The difference in the two items was not significant among the RDS, RD and the CK treatments. These results indicated that the duck raising under precision hill-direct-sowing had better activity of the roots, roots absorbing area, shoot dry matters accumulated and the root volume than the regular rice direct sowing. The activity of the roots stayed at a high level in the whole growth period and the aging of the rice at the middle and late stages slowed down, facilitating the growth of the shoot and the formation of the yield.

Key words: Rice direct sowing, Rice-duck farming, Yield, Root growth character

CLC Number: 

• S511.01