Before the winter wheat sowing, the soil fertility tester will be ploughed and leveled, and fertilized after sowing. After summer wheat was harvested, summer corn was sown and no tillage was sown. The winter wheat variety is Nongda 518 and the summer corn is Nongda 80. The sowing volume is the same as in the local area. Other field management is the same as in the local area. During the crop harvesting period, all micro-plants were sampled. Wheat stems and leaves, grains and pods, summer corn leaves, grains and cobs. Samples from each site were immediately subjected to fixation at 105°C for 30 minutes, and the biomass, total nitrogen, and 15N abundance were measured after drying, weighing, and crushing at 65°C.
The nitrogen uptake of chemical fertilizers by crops in the current or rotation crop period increased with the increase of fertilizer application, but the absorption rate decreased with the increase of nitrogen application rate. Under the traditional nitrogen application rate (>300kg/hm2) in Beijing, the nitrogen absorption rate of fertilizers during the entire rotation cycle is only about 28%. However, the uptake of nitrogen by chemical fertilizers by later crops was lower than 10% of the amount of nitrogen applied. However, regardless of the winter wheat season, the summer maize season, or the entire rotation period, the nitrogen uptake of nitrogen-treated crops was significantly higher than the control, indicating that even under high fertility, nitrogen application had a significant effect on the amount of nitrogen uptake in the crops. .
The measured results of the soil fertiliser detector show that the nitrogen absorption of the crop can reach 235kg/hm2. In a certain low fertilization amount, the crop absorption will increase, but it will not always show a positive correlation. When the amount increases to a certain amount, absorption decreases. Therefore, the amount of fertilizer applied to crops has a greater impact on the absorption and has important implications for plant growth.
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