|
| Effects of different amount of wheat-residue application ongrowth of direct-seeding rice and characteristics of soil |
| |
| DOI： |
|
| Hits: 1509 |
| Download times: 543 |
| Abstract: |
| More than half of wheat-residue are burnt or discarded for years in China，which not only wastes
organic fertilizer source，but also pollutes the environment. To investigate the effects of different amount of wheatresidue
application on emergence in direct-seeding rice and physiological bases，a mid-season japonica rice cultivar
of Xudao 3 was directly sown in the pot，four treatments of wheat-residue application，3 t/hm2（S1），4.5 t/hm2
（S2），6 t/hm2（S3）and 7.5 t/hm2（S4）were set，the indicators like seedling emergence，dry matter weight，
and root length，root activity，decomposing and dynamic of straw，soil pH and organic acid content were determined.
The results showed that the wheat-residue application（the residue was incorporated into soil） reduced seedling
emergence by 13.1%-31.7% compared with the wheat-residue removal treatment. There was no significant difference in
morphological and physiological activity in direct-seeding rice between small amount of wheat-residue returning（S1）
with the wheat-residue removal treatment. With the increase of wheat-residue amount，morphological and physiological
activity of direct-seeding rice decreased，while no obvious difference was found between S3 and S4 treatment after 20
days of seedling. Wheat-residue application reduced the soil pH and straw decomposing rate，increased the amount
of decomposing quantity and organic acid content in the soil，but there was no significant difference under S3 and S4
treatment. Seedling emergence in direct-seeding rice was significantly correlated with the soil organic acid content，
the correlation coefficient reached 0.8951. Reasons for the characteristics of soil in direct-seeding rice，growth and
development under different amount of residue returning were discussed，to provide theoretical basis for clean and light
simplified cultivation in rice. |
|
View Full Text
View/Add Comment Download reader |
