After mulching, the temperature and humidity of the soil usually undergo the following changes:
Changes in soil temperature:
1.Heating effect: The mulch film can effectively block the loss of ground heat, thereby increasing the soil temperature. During the day, sunlight shines through the mulch film to the soil surface, causing the soil to absorb more heat;At night, mulch film reduces soil heat loss and maintains soil temperature. Therefore, mulching can increase the temperature of the soil, which is beneficial for the growth and development of crops.
2.Uneven temperature distribution: The air temperature between the soil surface and the mulch film will increase due to the barrier effect of the mulch film, while the temperature in the deep layers of the soil may be relatively low. This may lead to uneven distribution of soil temperature in the vertical direction, and care needs to be taken to adjust the way and time of mulching to avoid adverse effects on crop growth.
Changes in soil moisture:
1.Moisturizing effect: Mulch film can reduce the evaporation of soil moisture and maintain soil moisture. Mulch film prevents water from evaporating from the soil surface into the atmosphere, reducing water dispersion loss. At the same time, the mulch film can also reduce the erosion of the soil by rainwater and prevent soil moisture loss.
2.Locally moist: The surface of the soil under mulch film is usually kept moist, while the moisture in the deeper layers of the soil may be relatively low. This is because the mulch film prevents moisture from escaping into the atmosphere, causing moisture to accumulate on the soil surface. Therefore, in the case of mulching, proper irrigation management needs to be paid attention to to maintain the overall moisture balance of the soil.
It should be noted that the effect of mulching on soil temperature and humidity will be affected by factors such as climatic conditions, mulching type, mulching time and mulching method. Therefore, in practical applications, it needs to be adjusted and managed according to the specific situation to achieve the best results.