Soil Bulk Densitometer Analysis of Relationship between Soil Bulk Density and Root System

Crop production is inseparable from scientific farming, and choosing suitable methods and methods has a positive effect on the growth of soil and crops. However, if the long-term single farming method is bound to cause a decline in the fertility of the soil, impeding the increase in crop yields and the sustainable development of agriculture. Long-term no-tillage will lead to soil organic carbon and nutrient surface layer enrichment, stratification and other quality problems, and make diseases and pests aggravate; long-term less ploughing, such as rotary ploughing cause soil bulk density increases, easy to form a plow bottom layer, soil compaction, permeability The deterioration of nature will affect the growth and development of crop roots; long-term tillage will lead to a decrease in surface soil structural stability and agglomeration quality, exacerbating the loss of surface soil and wind erosion, and affecting soil water storage capacity. To this end, scholars at home and abroad are actively researching and exploring reasonable rotation farming patterns and cycles to solve the problems caused by the long-term single farming measures. The soil bulk density meter is an important instrument for determining the soil bulk density.

Under different tillage conditions, the number of secondary roots per plant in the early wheat growth period (before returning green) was 8.6-15, which was the highest after 2 years of rotary tillage, but the difference between different treatments was not significant. In the middle and later stages of fertility (after turning green), the number of secondary roots per plant is still the deepest tillage after 2 years of rotary tillage, followed by deep plowing for 3 years, followed by 3 years of continuous rotation tillage, and with the progress of fertility, the treatment The differences are getting bigger and bigger. Compared with deep plowing after 2 years of rotary tillage during grain filling and 3 years of continuous deep plowing, the number of secondary roots per plant increased by 1.3% to 4.0% and 14%, respectively. 20.5%, which differs significantly from the level of continuous rotation till 3 years. By the end of the waxing process, the differences between the treatments had narrowed, and they had not reached a significant level. It shows that deep plowing under the conditions of continuous rotation for 2 years promotes the occurrence of secondary roots in the middle and late stages of fertility, favoring tillering and panicle formation and grain filling.

Through the determination of the soil bulk density meter, it was found that during the growth period of wheat, the trend of the changes of root activity in different treatments was generally the same, both showing the tendency of rising first and then decreasing, among which the jointing reached its maximum value. The root activity of wheat was the highest after 2 years of rotary tillage. The difference between treatments was not significant before and during the maturing period (before jointing), but it was in the later growth period (after heading), 2 years after rotary tillage and 3 years after continuous rotary tillage. The difference was significant, and there was no significant difference between the three-year continuous deep tillage treatments. Near the time of maturity, the differences between different treatments narrowed, and they all failed to reach significant levels. It was shown that deep plowing after 2 years of rotary tillage had a positive effect on delaying root senescence in the late growth period of wheat.

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