The effect of soil temperature and humidity on plants What effect does soil temperature and humidity have on plant growth? It affects soil plants, micro-organisms and soil fertility. In addition, the solubility of gases, inorganic salts and other substances in the soil is affected by temperature, the diffusion of water and gas by temperature, the activity of exchange ions by temperature, the activity of micro-organisms by temperature, etc. These changes in the environment then affect the growth of the plant roots, the concentration of inorganic salt plasma is reduced, the plant absorbs less, microbial respiration can produce heat and also decompose the mineral nutrients in the soil, unsuitable temperatures reduce root respiration, weaken metabolism and slow growth, thus affecting above-ground growth, which then affects root growth. Air humidity has a huge impact on transpiration, photosynthesis and disease production in greenhouse crops, but it is not the case that more humidity is better for plants. In addition to water uptake, transpiration is also the driving force behind the transport of mineral nutrients. When air humidity is too high, transpiration is weak and the plant's ability to transport mineral nutrients is reduced, plant growth will be inhibited, resulting in reduced plant growth, increased leaf loss and reduced flower or seed vitality. At the same time, too much or too little air humidity can cause stomata to close. With plant stomata closed, CO2 cannot enter the foliage cells and photosynthesis slows down or even stops. Also, high humidity can cause water to condense on the leaf surface, causing leaf cells to break down and making the plant soft. One of the main problems with high humidity is that the village directly contributes to the propagation of diseases and makes pests and diseases more likely to occur. https://www.renkeer.com/soil-moisture-monitoring-system/