Biodegradable film is recognized as a promising alternative to plastic film within crop mulching. This is because biodegradable film disintegrates into water and carbon dioxide through soil microorganisms-facilitated catalytic decomposition during the crop growth season. However, biodegradable film mulching (BFM) also has some disadvantages, such as the water and heat conservation being poor during nighttime period. Crop growth and yield is reduced by a suboptimal distribution of soil water and temperature. Therefore, there is value in assessing the effects of BFM on crop growth during daytime and nighttime periods, and particularly under different irrigation levels. This study developed a crop growth model (FCM) considering the disintegrated area of biodegradable film mulching to capture crop growth dynamics under different soil water contents and mulching areas. The disintegrated area of biodegradable film was determined by an image method. The model was firstly calibrated and validated using observed data collected over two years (2018 and 2019) under three mulching treatments [plastic film mulching (PFM), biodegradable film mulching (BFM), and no film mulching (NFM)] and three irrigation levels (irrigation depths of 30, 22.5, and 15 mm). The model was then used to evaluate crop growth rate (k), crop yield (CY), and water use efficiency (WUE) during daytime and nighttime periods. The results showed that the simulation accuracy of the FCM model was sufficiently high under different treatments, with a root mean square error (RMSE) of 284.6 kg ha^–1. The benefits of BFM for crop growth were similar to that of PFM under a low range of effective accumulated soil temperature (EAST). However, differences in crop growth variables between PFM and BFM increased with an increase in EAST. Average leaf area index (LAI) and aboveground dry biomass (AB) during both years increased by 16.9 % and 39.2 % under PFM compared to that under BFM, respectively. In general, the harvest index (HI), CY, and water use efficiency (WUE) under BFM were lower than that under PFM. There were comparable variations in crop growth under different irrigation levels. The highest WUE occurred in the BFM_22.5 treatment at 44.5 kg ha^–1 mm^–1. Therefore, this study recommends an irrigation depth of 22.5 mm as an optimal irrigation treatment in an arid region.

生物可降解薄膜被认为是作物覆盖中塑料薄膜的有前途的替代品。这是因为可生物降解的薄膜在作物生长季节通过土壤微生物促进的催化分解分解为水和二氧化碳。然而，可生物降解地膜（BFM）也有一些缺点，如夜间节水保温较差。土壤水和温度的次优分布会降低作物生长和产量。因此，在白天和夜间，特别是在不同灌溉水平下，评估 BFM 对作物生长的影响是有价值的。本研究开发了一种作物生长模型 (FCM)，考虑了可生物降解地膜覆盖的分解面积，以捕捉不同土壤含水量和覆盖面积下的作物生长动态。生物降解膜的崩解面积采用图像法测定。该模型首先使用在三种覆盖处理[地膜覆盖 (PFM)、可生物降解地膜覆盖 (BFM) 和无地膜覆盖 (NFM)] 和三种灌溉水平下收集的两年（2018 年和 2019 年）观测数据进行校准和验证（灌溉深度为 30、22.5 和 15 毫米）。然后将该模型用于评估作物生长率（该模型首先使用在三种覆盖处理[地膜覆盖 (PFM)、可生物降解地膜覆盖 (BFM) 和无地膜覆盖 (NFM)] 和三种灌溉水平下收集的两年（2018 年和 2019 年）观测数据进行校准和验证（灌溉深度为 30、22.5 和 15 毫米）。然后将该模型用于评估作物生长率（该模型首先使用在三种覆盖处理[地膜覆盖 (PFM)、可生物降解地膜覆盖 (BFM) 和无地膜覆盖 (NFM)] 和三种灌溉水平下收集的两年（2018 年和 2019 年）观测数据进行校准和验证（灌溉深度为 30、22.5 和 15 毫米）。然后将该模型用于评估作物生长率（k )、作物产量 ( CY ) 和白天和夜间的水分利用效率 (WUE)。结果表明，FCM模型在不同处理下的模拟精度足够高，均方根误差（RMSE）为284.6 kg ha ^–1。在低有效累积土壤温度 (EAST) 范围内，BFM 对作物生长的益处与 PFM 相似。然而，PFM 和 BFM 之间作物生长变量的差异随着 EAST 的增加而增加。与BFM相比，PFM下两年的平均叶面积指数（LAI）和地上干生物量（AB）分别增加了16.9%和39.2%。一般来说，收获指数（HI)、CY和用水效率 (WUE) 在 BFM 下低于 PFM 下。在不同的灌溉水平下，作物生长有可比的变化。最高的 WUE 出现在 BFM _22.5处理中，处理量为 44.5 kg ha ^–1 mm ^–1。因此，本研究推荐 22.5 mm 的灌溉深度作为干旱地区的最佳灌溉处理。