# Experiment on Cultivation Performance of Plant Fiber-Based Degradable Film in Paddy Field
## 1 Introduction  
The rice productivity in China is the highest around the world. Rice plantings accounted for 30% of arable land, and production accounted for 40% to 50% of total national grain production. The yield reduction of rice due to diseases and weed was up to 100% and 66%, with an average of 24% [1]. In 2010, global paddy field pesticide sales accounted for 9.9% of the entire pesticide market, of which herbicides reached 43.2% [2]. Herbicides played an important role in weed inhibition in the paddy field and stable production of rice. However, long term application of herbicides also had negative effects, such as the increase of herbicide-tolerant weed biotypes, the residues and accumulation of herbicide, and the issues of ecological balance, environmental governance, and human and animal health [3]. Therefore, the study of paddy mulching cultivation had been researched by domestic and foreign scholars [4; 5; 6].  
The weed under the membrane grew seriously at plastic film mulding cultivation, thus seriously competing for the nutrients and moisture needed for crops. In order to inhibit weed, it was necessary to apply herbicides before the film mulching, which was easy to pollute the soil and groundwater, worsen the ecological environment, and lead to a decline in yield and quality. At the same time, plastic film was difficult to degrade and remained in the soil, which not only destroyed the soil structure,inhibited the normal absorption of water and nutrients by plant roots, reduced the yield and quality of crops, but also hindered the sustainable development of agriculture [7; 8]. So as to solve the negative effects caused by plastic film mulching, new environmental-friendly films such as biodegradable film, photodegradable film, photo-biodegradable film, and plant fiber-based degradable film had been successively launched [9; 10; 11; 12]. The photo-biodegradable film can be degraded due to the synergistic effect of photo-degradation and biodegradation without substantial residual film damage. However, due to the high cost of photo-biodegradable film, the degree of industrialization was not enough. At present, its application was still in the stage of small-scale experiment, and further research was needed. The plant fiber-based degradable film had no significant difference with plastic film in terms of increasing soil temperature, inhibiting weed, promoting crop growth and development, improving crop yield and water use efficiency, which can replace plastic film for agricultural production [13; 14; 15; 16].  
Regarding plant fiber-based degradable film, the current research focus was on the raw material composition, degradation properties and the comparison of different types of plant fiber-based degradable film, but lack of systematic research on the application of plant fiber-based degradable film in the field [17; 18]. In addition, the effects of temperature increasing, water retention and yield increasing of mulching cultivation techniques had been studied in depth, and the research fields included different regions, different soil types, and different crop types [19; 20; 21; 22]. For rice cultivation, most studies were limited to film mulching aerobic cultivation, and there were few studies on the waterlogged cultivation of plant fiber-based degradable film, which was lack of the research of the effect of paddy mulching cultivation on weed growth, soil temperature, rice yield, rice quality, and economic benefit. In order to provide a theoretical basis for the large-scale application of plant fiber-based degradable film, the research systematically studied the effects of plant fiber-based degradable film on the weed inhibition, warming effect under mulching cultivation, rice yield, rice quality, and economic benefit.