Abstract:

Aiming at reducing agricultural pollution caused by plastic film, the effects of re-used plastic film mulching on soil temperatures and seed emergence were studied through comparing with the new plastic film mulching, and open field in 2009-2010 in Hetao region. The results showed: compared to bare field, re-used film mulching could significantly increased sunflower’s plant height 6.3% and 7.5%, stem diameter 6.8% and 17.4%, disc diameter 8.0% and 9.6%, leaf dry weight 24.9% and 33.2% and total dry weight 29.4% and 25.3% respectively in 2010 and 2011. Except stem diameter, plant height, disc diameter, leaf dry weight and total dry weight of re-used film mulching was slightly lower than that of new film mulching, but the difference was not significant. Compared with bare field, yield per plant of re-used film mulching was significantly increased 3.3% (2010) and 10.4% (2011), 100-seed weight of re-used film mulching was significantly increased 3.7% (2010) and 5.8% (2011), and they were lower than that of new film mulching, but the difference was not significant. In addition, compared with bare field, sunflower yield of re-used film mulching was significantly increased 11.4% (2010) and 16.8% (2011), and compared to the new film treatment, the yield decreased 3.3% (2010) and 2.6% (2011).