Soil moisture measurement using soil drill, in the test area from top to bottom to take a soil sample every 10cm, weigh the soil with one ten-thousandth precision electronic balance, and then drying in the oven, call the dry weight, measure each The mass moisture content in the layer of soil is finally converted to volumetric moisture content. Maize growth period is strictly observed in accordance with the "Agricultural Meteorological Observation Standards." Or directly using the soil moisture recorder for the determination, so that the detection process is simple and accurate results can be obtained.
Above 50cm soil layer in the underground, the vertical distribution of the root length density of the maize in different growth stages is downwardly decreasing. The root length density below 50 cm soil layer in milk ripening and ripening period had a consistent trend with soil moisture. Root growth was positively correlated with soil moisture, and the layers with more water corresponded to larger root length density and more root weight. The unbiased correlation coefficient between the increment of root length density and the amount of soil moisture in different growth stages was 0.38, 0.9 and 0.7 respectively.
Through the comparison of real-time monitoring data of soil moisture recorders, it was found that the growth of root length density of maize was consistent with the trend of soil moisture from the tasselling stage to the milk-mature stage, and the underground root system was still in the growth state from the milk ripening stage to the ripening stage. The deficit in water may be related to the demand for water during the milk ripening and ripening of corn. The higher the ground temperature is, the shorter the root thickness of the soil surface and the finer the lateral roots are. Temperature can have a certain effect on root growth and physiological activity.
Roots have a strong influence on the formation of crops from yield, and are also an important indicator of crop growth and development and yield. It is of great theoretical and practical significance to study the root morphological characteristics, physiological functions, growth and development laws, root ecology, and root regulation techniques. The observation data of the root profile observation system analyzes and analyzes the differences in soil moisture and land surface temperature and the growth status of the roots at different growth stages of maize, and provides references for the research and application of crop roots in agricultural ecology. The root length and root dry weight of maize under different cultivation methods increased gradually with the growth period, and gradually decreased with the deepening of soil layers. In the process of research, the soil moisture and other parameters will also affect the growth of the root system. For the determination of soil moisture, the soil moisture recorder is generally used for the determination.