Summer corn is widely planted in the Huang-Huai-Hai area. Because of the high temperature and rain in the area, corn plants are generally taller, which also leads to the difficulty of topdressing corn. In order to be able to meet the nutrient demand of corn throughout the growing period, it is necessary to use a controlled-release fertilizer that has a long pot life. Controlled-release fertilizers can increase the utilization efficiency of fertilizers and crop yields, and the controlled-release urea yield on rice is more than 36.5%. The effective panicles per unit area and the number of solids per panicle are significantly increased. The effect of controlled-release fertilizer on soil nutrients generally needs to be determined to determine the final result. For the content of nitrogen in the soil, it can be measured by the automatic Kjeldahl determination instrument.
It is well known that nitrogen accumulation reflects the absorption of nitrogen nutrients during the whole growth period of corn. The effects of different fertilization treatments on post-anthesis nitrogen accumulation in maize are shown in Table 3. During the whole maize growth process, the amount of nitrogen accumulation before flowering was greater in the normal fertilizer treatment, and then the growth trend was slower or even did not increase; Fertilizer treatment CRFIII, CRFII and CRFI continued to increase, even in the later period of childbirth, showing a steady growth trend, reaching the highest maturity; controlled release fertilizer treatment SCF also showed the same trend.
Nitrogen fertilizer agronomic efficiency is a reflection of the increase in crop yield per unit of fertilizer, and is one of the most important economic indicators in agricultural production. Controlled-release fertilizer with high fertilization rate has a slightly lower agronomic efficiency, but it is still higher than common fertilizer (CCF), and the difference reaches a significant level. The nitrogen absorption efficiency and nitrogen production efficiency of controlled-release fertilizers were significantly higher than that of CCF, and decreased with the increase of fertilizer application rate. The nitrogen fertilizer utilization rate of controlled-release fertilizers was 32.76%~53.33% with an average of 40.78%, which was significantly higher. It was treated with CCF and showed a downward trend with increasing amount of fertilizer. In general, the nitrogen fertilizer utilization rate of controlled-release fertilizer treatment is higher than the average nitrogen fertilizer utilization rate (35%) in China. The difference in nitrogen harvest index (NHI) was not significant, and the reduced-control release fertilizer treatment was higher than the total treatment and CCF.
The analysis of soil nitrogen content by automatic Kjeldahl test showed that controlled-release fertilizer can significantly increase corn yield, and the advantage of increasing grain weight in the yield components is greater. Controlled-release fertilizer significantly increased nitrogen accumulation after anthesis, maintained high photosynthetic rate and dry matter accumulation, ensured the nutrient requirements of grains, and significantly increased nitrogen use efficiency and agronomic efficiency.
It is well known that nitrogen accumulation reflects the absorption of nitrogen nutrients during the whole growth period of corn. The effects of different fertilization treatments on post-anthesis nitrogen accumulation in maize are shown in Table 3. During the whole maize growth process, the amount of nitrogen accumulation before flowering was greater in the normal fertilizer treatment, and then the growth trend was slower or even did not increase; Fertilizer treatment CRFIII, CRFII and CRFI continued to increase, even in the later period of childbirth, showing a steady growth trend, reaching the highest maturity; controlled release fertilizer treatment SCF also showed the same trend.
Nitrogen fertilizer agronomic efficiency is a reflection of the increase in crop yield per unit of fertilizer, and is one of the most important economic indicators in agricultural production. Controlled-release fertilizer with high fertilization rate has a slightly lower agronomic efficiency, but it is still higher than common fertilizer (CCF), and the difference reaches a significant level. The nitrogen absorption efficiency and nitrogen production efficiency of controlled-release fertilizers were significantly higher than that of CCF, and decreased with the increase of fertilizer application rate. The nitrogen fertilizer utilization rate of controlled-release fertilizers was 32.76%~53.33% with an average of 40.78%, which was significantly higher. It was treated with CCF and showed a downward trend with increasing amount of fertilizer. In general, the nitrogen fertilizer utilization rate of controlled-release fertilizer treatment is higher than the average nitrogen fertilizer utilization rate (35%) in China. The difference in nitrogen harvest index (NHI) was not significant, and the reduced-control release fertilizer treatment was higher than the total treatment and CCF.
The analysis of soil nitrogen content by automatic Kjeldahl test showed that controlled-release fertilizer can significantly increase corn yield, and the advantage of increasing grain weight in the yield components is greater. Controlled-release fertilizer significantly increased nitrogen accumulation after anthesis, maintained high photosynthetic rate and dry matter accumulation, ensured the nutrient requirements of grains, and significantly increased nitrogen use efficiency and agronomic efficiency.
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