Crops are very sensitive to water deficit during growth and development. The decline of crop yield caused by drought is mainly reflected in the inhibition of physiological functions, resulting in the weakening of product transport and transformation efficiency after irrigation. The effect of water deficit on the physiological function of crops is not equal, mainly depends on the extent of water loss. The soil moisture (moisture) speed measuring instrument is very scientific and accurate in the determination of soil moisture, and is indispensable in the analysis of the relationship between sweet pepper and water.
The analysis of soil moisture content by soil moisture tester found that the water potential of sweet pepper leaves increased significantly with the increase of soil water content, which was mainly reflected in the soil water content of 65%~75%Hf and 75%~85%Hf treatment. The difference between the difference between 65% and 75% Hf and 55% to 65% Hf was significant, while the leaf water potential difference between the two high water treatments and the leaf water potential difference between the two low water treatments were not significant. This indicates that there is a close relationship between the water potential of sweet pepper leaves and soil water content, but the degree of response of leaf water potential is different. The critical water content of soil should be 65%~75%Hf, higher than critical water content and lower than critical. The leaf water potential of the water content changes in a threshold state. The stomatal conductance, fresh water content and cell fluid concentration of sweet pepper leaves are very similar to leaf water potential, and they all show threshold change characteristics with critical water content, but the cell liquid concentration increases with soil water content. However, although the chlorophyll content increased under mild water stress [6], it decreased sharply under severe water stress. This may be due to heavy water stress leading to chlorophyll decomposition, so the change is more complicated. It can be seen that leaf water potential, leaf fresh weight water content, cell fluid concentration and stomatal conductance can better reflect soil moisture status.
The suitable soil moisture content of greenhouse potted sweet peppers is between 65% and 75% Hf. Below or above this water content will have an adverse effect on the crop. However, the degree of their effects is different. Under mild water stress, the drought stress signal substances (such as ABA) produced by the roots are transported to the leaves through the xylem to participate in the regulation of stomatal pores. It is the opening or partial closure of the stomata that affects the entry of the photosynthetic substrate.
The soil moisture (moisture) speed meter can effectively find out that the soil moisture of sweet pepper growth can be found that when the soil moisture is higher than the suitable water content, the physiological activity of the plant will be reduced, and even the transportation of photosynthetic products will be hindered. Distribution, which severely restricts the growth and development of sweet pepper, affecting its yield and quality.
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