| Abstrakt: |
In order to alleviate the pressure caused by the surplus of straw resources and the shortage of water resources in arid areas, the synergizing effect of cotton stalk biochar (CBC) and film mulched drip irrigation (FDI) on the improvement of sandy soil was explored. In 2017-2018, according to percentage of soil mass in the cultivated layer, six treatments were set for CBC addition rate at 0% (BC0), 1%(BC1), 2% (BC2), 3% (BC3), 4% (BC4) and 6% (BC6) in sandy soil. The results showed that the average soil moisture content of the 0-45 cm soil layer increased first and then decreased with the increasing CBC addition rate, but this trend was contradictory in the soil layer of 45-75 cm. The change trend of evapotranspiration (ETc)was BC0 > BC1 > BC2 > BC6 > BC3 > BC4 at seedling stage, late boll-forming stage, and boll-spitting stage, and BC4 > BC3 > BC0 > BC6 > BC2 > BC1 at the other stages. With the increasing CBC addition rate, the total ETc and yield had a trend of first increasing and then decreasing. Compared with no CBC addition, the water-saving and yield increasing effects of 4% biochar addition can reach more than 7% and 22% respectively. Overall, these findings suggest that the synergistic effect of CBC and FDI induces a significant positive effect on sandy soil improvement in arid areas, and the best CBC addition rate of sandy soil used in the test was 3.86%. [ABSTRACT FROM AUTHOR] |
