1.What is mulch?
The traditional mulch film, the full name of the polyethylene blown agricultural ground cover film, refers to the film used for ground cover produced by the blow molding method with polyethylene as the main raw material, and an appropriate amount of additives can be added. There are also uses for purposes such as weeding.
The mandatory national standard GB13735 specifies the classification and code, recommended thickness and reference coverage of mulch film, requirements, test methods, inspection rules, marking, packaging, transportation and storage.
2.What is biodegradable mulch?
According to the provisions of the national standard GB/T 35795, the fully biodegradable agricultural ground cover film refers to a film with biodegradable properties that is prepared from biodegradable materials as the main raw material and used to cover the soil surface during crop planting. Biodegradable agricultural mulch film can play some roles such as soil warming; limiting water evaporation and maintaining soil humidity; inhibiting the growth of weeds (especially when the mulching film product used is a black film or non-transparent film); inhibiting mineral elements It avoids the damage of residual film fragments to the soil capillary structure and inhibits soil compaction; it is non-toxic and has no side effects on soil and crops after degradation.
3.What are the main biodegradable materials?
Fully biodegradable mulch film currently mainly refers to aliphatic polyester (such as PBSA, PBS), aliphatic-aromatic copolyester (such as PBAT), carbon dioxide-epoxy compound copolymer (PPC) and One or more resins in other biodegradable polymers (such as PCL, PHA, PGA, etc.) are the main components, and it is allowed to add an appropriate proportion of biodegradable natural polymer materials such as starch, cellulose and other Inorganic fillers and functional additives without environmental hazards, agricultural ground cover films produced by blow molding or casting processes.
4.What is total biodegradation?
Total biodegradation or biodegradation or biodegradation refers to the degradation of materials due to biological activities, especially the action of enzymes, so that they are gradually digested by microorganisms or some organisms as a nutrient source, resulting in their relative relative Molecular mass reduction and mass loss, physical properties decline, etc., and finally decomposed into compounds with simpler components, mineralized inorganic salts of contained elements, and a property of biological dead bodies. Simple compounds, mainly referring to carbon dioxide (CO2) or/and methane (CH4), water (H2O), etc.
5.Characteristics or requirements of biodegradable mulch film for rice
Safety: The materials and related auxiliaries of the biodegradable mulch film are non-toxic and safe;
Operability: It has good physical strength and can meet the requirements of mechanized operation;
Functionality: It has a certain temperature increasing function, good grass pressing and water saving functions;
Controllability: The mulch film can remain unbroken for a certain period of time to meet the needs of the mulch film function in the early production of rice;
Economy: The economic benefits brought by mulching are much higher than its input costs.
6.Laying method of biodegradable mulch film for rice
Mechanical Lamination
Manual film laying
7.The role of biodegradable plastic film in rice growth?
When biodegradable plastic film is used in rice, the situation in different regions is slightly different. For example, the film laying in Heilongjiang and Hainan in the northeast is not the same, but the main functions are similar, mainly for grass pressing and water saving, followed by increasing ground temperature to promote rice. grow.
8.Can the biodegradable plastic film be completely degraded after the rice is harvested?
This depends on the characteristics and environmental conditions of the biodegradable plastic film. In general, it can completely lose its strength without affecting the cultivation. Generally, it can be fully degraded after ploughing in the current season.
9.Does biodegradable plastic film increase or decrease rice production?
In general, biodegradable plastic film mulching can increase rice yield to a certain extent and improve the economic benefits of rice production, especially in organic rice production.
10.Application scale of biodegradable mulch film for rice at home and abroad
There is very little production of plastic film rice abroad. In Italy, bio-film is used in direct rice production, but it is in the experimental stage. The area of rice covered with biodegradable plastic film in my country is at the 10,000-mu level, mainly distributed in Yunnan, Hainan, Shanghai, Jiangsu, Zhejiang, Anhui, Xinjiang and Northeast China. superior.
