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In the application of nitrogen fertilizer, there are four kinds of treatments: low-nitrogen treatment (severe nitrogen deficiency), medium-nitrogen treatment (slight nitrogen deficiency), and optimization treatment (after using soil NPK detector to measure Appropriate supplements), high nitrogen treatment (appropriate additions based on optimization). When using a hand-held leaf area meter to measure leaf area, it was found that the leaf area index of cotton gradually increased with the increase of nitrogen application rate. The leaf area index of the optimized treatment is the largest, indicating that this nitrogen application rate is conducive to the growth of the leaves and maintains the best state. Low-nitrogen treatment showed that the plant growth was slower without applying nitrogen fertilizer, and the leaf area index was smaller.
In terms of yield, the results were optimized> medium nitrogen> high nitrogen> low nitrogen, and the optimized treatment yield was significantly higher than that of medium nitrogen treatment. The use of a soil tester to measure and understand the absence of nitrogen in the soil for fertilization can provide sufficient nitrogen for the cotton. If the nitrogen content is too high, excessive nutrient uptake by the cotton will affect the nutrient absorption of the cotton to a certain degree. The yield of cotton.
The utilization of nitrogen fertilizer is mainly characterized by optimized treatment> high nitrogen treatment> medium nitrogen treatment> low-nitrogen treatment. Therefore, the appropriate amount of nitrogen fertilizer can be used when nitrogen is applied to make full use of nitrogen fertilizer and achieve high yields. Excessive nitrogen fertilizer not only fails to reach the maximum yield but also wastes a large amount of chemical fertilizer, causing soil contamination. A soil fertilizer tester can be used to measure the soil when the nitrogen content of the plant is sufficient, and a hand-held chlorophyll meter can also be used to measure the SPAD value in the leaf to understand the loss of nitrogen in the plant.
Effects of different nitrogen treatments on plant yield and soil utilization The nitrogen content in soil has a certain influence on the yield of crops, mainly because the content of nitrogen affects the chlorophyll content in the leaves of plants, and the main factors affecting the synthesis of plant organic matter Chlorophyll content. However, nitrogen also affects plant height, leaf area index and biomass. The following experiments were conducted with cotton.
October 22, 2023