Soil bulk density suitable for growth and development of maize roots 1 Soil bulk density has a great influence on the growth of maize roots. With the increase of soil bulk density, all indexes that reflect root growth have decreased, especially when the bulk density exceeds the designed bulk density of 1.2g/cm3, the difference in growth index reached a very significant level; when the bulk density exceeds 1.3g/cm3 With the increase of soil average bulk density, although each growth index showed a decreasing trend, the influence of bulk density was not significant, and different bulk density had an impact on root activity, and root activity showed an upward trend before the grain filling period. When the bulk density exceeds the designed bulk density of 1.3 g/cm3, the activity of the root system significantly decreases, and then decreases slowly. 2 Regulation of Organic Matter The study of organic matter has a significant effect on the regulation of bulk density. The organic matter treatment indicators were significantly higher (P<0.01) than the control, because the organic matter significantly increased soil porosity, water holding capacity, and aeration, significantly reduced the bulk density, and adjusted soil water, fertilizer, and The gas and heat capacity increased significantly and promoted the growth and development of the maize root system. High soil-concentrated soil organic matter can be adjusted to 4% to 5% to obtain ideal regulation results; the upper limit of soil organic matter regulation of low bulk density needs further study, but for the test soil, it is clear that the organic matter content is 1.5%. Left and right will restrict the growth of corn. It is considered that the content of organic matter in high-yield and super-high yield corn fields is at least adjusted to more than 3%. 3 Study on regulation of plough layer thickness The results of the regulation of the plough layer thickness in the test soil were not satisfactory. The plough layer thickness treatment had no significant effect on plant height, stem diameter, total root length, chlorophyll a, yield, etc., but only had a significant effect on individual indicators in individual periods. The comparison of different plough layer thickness treatments shows that when the plough layer thickness is adjusted to 30-40 cm, the increase of various indicators basically reaches the limit, and the effect of increasing the plough layer thickness is no longer obvious, and the economical efficiency is reduced. Related Instruments: Root Analyzer Soil Crusher Compressed Knitted Mesh Gasket with
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