Preparation and applications of chitosan/poly（vinyl alcohol） liquid mulch films

doi:10.19491/j.issn.1001-9278.2022.03.004

Abstract

Abstract:

To deal with the environmental and ecological problems caused by plastic mulch films， a type of degradable liquid mulch films was successfully prepared through solution blending using chitosan and poly（vinyl alcohol） as raw materials. The effect of the solution mass ratio of chitosan to polyvinyl alcohol on the mechanical properties， water vapor transmission rate， and water solubility of chitosan/polyvinyl alcohol dry films was investigated. The water content of soil， seed germination rate， and the growth of tomato in greenhouse were evaluated after spraying chitosan/polyvinyl alcohol liquid mulch films. The results indicated that the chitosan/polyvinyl alcohol dry films exhibited optimal comprehensive performance at a mass ratio of chitosan solution （1.0 wt%） to polyvinyl alcohol solution （4.0 wt%） of 8∶2. The liquid chitosan/polyvinyl alcohol mulch films could reduce the water evaporation in the soil， and they presented a water loss rate of 4.02 wt% after applying the liquid mulch film for 14 days， which was lower than the control sample. Compared to the control sample， the Lettuce， sweet crispy Chinese cabbage 8201， and Zhongshu No. 4 tomato exhibited an increase in germination rate by 4 %， 7 %， and 4 %， respectively， after spraying the liquid mulch films for 12 days. The node number of tomato seedlings was 0.23 greater than that of the control after spraying the liquid mulch films for 21 days， and their average plant height was 2.47 cm higher than that of the control.

Key words: chitosan, poly（vinyl alcohol）, liquid mulch film, biodegradability, water retention property, seed germination rate

CLC Number:

TQ321

SUI Zhenquan, MAO Jinchao, FAN Jinshi. Preparation and applications of chitosan/poly（vinyl alcohol） liquid mulch films[J]. China Plastics, 2022, 36(3): 21-25.

Figures/Tables 6

Fig.1. Tensile properties of dry films prepared by different mass ratio of chitosan to poly（vinyl alcohol）

Fig.2. Influence of chitosan and polyvinyl alcohol mass ratio on water vapor transmittance rate and water solubility of dry film

Fig.3. Effect of liquid plastic film spraying on soil water loss per day

Fig.4. Effect of liquid plastic film spraying on soil water loss rate

Fig.5. Effect of liquid plastic film spraying on seed germination rate

Fig.6. Influence of liquid plastic film spraying on the number and plant height of elemental aromatic nodes

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