Abstract
In order to promote the rational use of nitrogen fertilizer, the dry matter accumulation, nitrogen absorption of processed pepper were studied by substrate culture and quantitative irrigation of nutrient solution under 6 different nitrogen levels (60%, 80%, 90%, 100%, 120% and 140% of the normal N application). It showed that, with the increase of nitrogen application, the dry weight of leaf, dry weight of fruit, dry weight of stem, dry weight of root, and dry weight of plant were increasing; The nitrogen content of each part run up to the maximum at 80%~100% nitrogen level; There was no significant difference between the dry weight of leaf, dry weight of root, and dry weight of fruit, as well as nitrogen content and nitrogen accumulation of these parts at 90%, 100%, 120% and 140% nitrogen level. Correlation analysis showed that nitrogen accumulation showed the highest correlation with the dry weight of leaf, dry weight of stem, dry weight of fruit, dry weight of root, and dry weight of plant, but had little correlation with nitrogen content in each part. In addition, the slight difference in nitrogen content of plant at different nitrogen levels can reflect its nutritional status, while the amount of dry matter can reflect its amount of nitrogen accumulation. This study will provide theoretical reference for rational application of nitrogen fertilizer in processed pepper.
Highlights
Pepper has the characteristics of fast growth and high yield per unit
The slight difference in nitrogen content of plant at different nitrogen levels can reflect its nutritional status, while the amount of dry matter can reflect its amount of nitrogen accumulation
Previous studies showed that there was no significant difference in plant growth index of processed pepper between 90% of normal nitrogen application and 100%, 120% and 140% nitrogen application, as well as the yield characteristics of 80%, 90% and 100% nitrogen application
Summary
Pepper has the characteristics of fast growth and high yield per unit. It has a large demand for fertilizer, especially nitrogen fertilizer. When the nitrogen reached a certain threshold, the growth yield of pepper fruit decreased, and it was not significantly increased. Unreasonable application of nitrogen fertilizer, especially excessive application of nitrogen fertilizer, does not increase yield significantly, and causes a series of problems such as crop quality decline, nitrogen use efficiency decline and waste of resources, and environmental pollution, soil nutrient imbalance (Zhu et al, 2005). The highest biomass was observed with nitrogen 240 kg/hm treatment (Han et al, 2010) The economic traits such as plant and branch number, fruit number per plant and fresh weight per fruit of pepper in Xishui County of Guizhou with nitrogen application 18 kg/667 m2 were the best, and the yield was the highest. The dry matter accumulation and nitrogen absorption and utilization characteristics of processed pepper under different nitrogen levels were further analyzed in detail, to provide theoretical reference for rational application of nitrogen fertilizer and the realization of nitrogen reduction and efficiency increase in processed pepper
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