One of the basic physical properties of soil is the bulk density, which affects the water storage and aeration of the soil. It also has a profound effect on the soil and fertility and the growth of the plant, and also has a greater impact on the root system of the crop. In the maize seedling stage experiment, with the increase of the bulk density, the root length of maize seedlings linearly decreased, and the root diameter increased linearly. The presence of a compact layer in the soil changed the normal distribution of the wheat root system in the soil profile. The amount of roots in the upper part of the plough in the seedling stage and the booting stage was significantly increased, while the amount of roots in the lower part of the plough layer was suddenly reduced. At present, there are few reports on root biomass and root absorption surface area in different soil layers, and there are few studies on the effect of fertilization on root absorption surface area in different soil layers. Determination of soil bulk density can generally be measured using a soil bulk density meter.
The soil was passed through a 5 mm sieve and filled into 5 PVC pipes with a diameter and height of 10 cm that were glued together in the vertical direction. A total of 7 treatments were used. A, B, and C respectively represent the bulk density of 111, 112, 113 g/cm3, and BF2. CF2 represents 10-20cm soil fertilization, BF3, CF3 represents 20-30cm soil fertilization. Each treatment is set 3 times. Simut 25 corn seeds were selected for sowing on May 15, 2005 and corn plants were harvested on September 24. The function of the soil bulk density meter in the determination process is very powerful.
The determination of soil bulk density instrument found that there was a negative correlation between root dry weight and bulk density within a certain range of bulk density. With respect to the effect of bulk density on root growth, studies have also shown that as the soil bulk weight increases, plant root length decreases, and shoot and root biomass decreases. Fertilization can significantly increase the dry weight of the roots. This experiment concluded that fertilization in 20-30cm soil layer is better than fertilization in 10-20cm soil layer. Under the higher soil bulk density, the inhibition of deep root growth is greater than that of the surface roots. Therefore, fertilization in a slightly deeper soil will increase the root biomass, which has a certain theoretical basis for guiding deeper fertilization in agriculture.
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