Abstract:
【Objective】 Scientific evaluation of the influence of different types of plastic film on cotton growth and its own degradation and recycling characteristics.
【Methods】 In this study, the polyethylene mulch (CK) was used as the control, and the recyclable high-strength mulch (G) and four degradable mulches (J
1, J
2, J
3 and J
4) were set and their effects on cotton growth and yield, recycling effects and field degradation were compared and analyzed in order to screen out the green production mulch with excellent comprehensive performance.
【Results】 The height and stem diameter of CK treatment at bud stage and flowering stage were 62.08 cm, 7.36 cm and 103.75 cm, 10.36 cm, respectively.The plant height of degraded mulch film treatment was 4.66%-13.21% lower than that of CK, and there was no significant difference in plant height and stem diameter between G treatment and CK.In terms of yield performance, the aboveground biomass of CK treatment at bud stage, flowering stage and boll stage were 17.77, 43.36 and 744.97 g/plant, respectively.G treatment was 7.45%-19.90% higher than CK at all growth stages, and was significantly higher than degraded film.Single boll weight and seed cotton yield of CK treatment were 5.37, 5.18 g and 5,642.14 kg / hm
2, respectively.Compared with CK, the boll weight of G treatment was significantly reduced by 0.23 g/plant, but the number of bolls per plant was significantly increased by 0.94 per plant, and the yield was significantly increased by 620.91 kg/hm
2, an increase of 11.00%.There were no significant differences in boll number per plant, boll weight per plant and yield between the treatment of degraded mulch film and CK, but they were significantly reduced by 0.22-0.47, 0.15-0.30 g and 8.75%-15.22%, respectively.The recovery rates of G and CK were 82.81% and 92.16%, but G treatment was 9.35% higher than CK.The degradation rate of J
2 treatment was 89.49%, which was 6.67% lower than that of CK.
【Conclusion】 Degradation film treatment cost is lower than that of polyethylene film yield, but it needs further improvement.The total recycle of high-strength mulch film can increase the cotton yield by 620.91 kg/hm
2, increased by 11.00%, and the recovery rate increased by 9.35%, which has good application potential, and can be used as a new type of green, safe and environmentally friendly mulch film in cotton field for large-scale extension.