What is the difference between plastic film mulching cultivation and non-plastic film mulching cultivation in fertilizer and water management?

There are some differences in management between plastic film mulching cultivation and non-plastic film mulching cultivation. The specific differences are as follows: ① Water management: Plastic film mulching can reduce the evaporation of soil water. In the early growth stage of pepper after planting, the amount and frequency of watering are less than that of open cultivation without plastic film, which can prevent the ground temperature from dropping due to excessive watering, thus promoting the growth of fast and slow seedlings of plants. In the middle and late stage of plant growth, because plastic film mulching promotes plant growth, plant growth is relatively vigorous, and leaf water transpiration is large, so it is necessary to increase watering amount and watering times. (2) Fertilizer management: Pepper has a long growth period and a large amount of growth. Only base fertilizer can not meet the needs of the whole growth period, especially in the full fruit stage and middle and late stage, and must be topdressing. It is best to inject quick-acting fertilizer around the root system with a fertilizer injector to improve fertilizer efficiency. Can also be combined with furrow irrigation, topdressing chemical fertilizer and human excrement and urine. The harvesting period is generally 15 ~ 20 days. In addition, foliar topdressing can be carried out, that is, foliar fertilizers such as urea and potassium dihydrogen phosphate can be sprayed. Foliar topdressing should be carried out in the morning or evening, which is beneficial to foliar absorption, and should not be sprayed at noon, windy day or rainy day with sufficient sunshine and high temperature.