Abstract
Experiments were carried out to study the effects of nitrification inhibitors (NI) on the transformation of soil nitrogen (N) in purple soil and the effects on the N accumulation in different organs of citrus seedlings. In incubation and pot experiments, the rate of nitrification inhibitors 2-chloro-6-trichloro-methyl pyridine (Nitrapyrin), 3,4-dimethylpyrazole phosphate (DMPP) and dicyandiamide (DCD) was 2.4%, 1.0% and 5.0% of N rate, respectively. The trend of different nitrification inhibitors on ammonium nitrogen ( NH+4-N ), nitrate nitrogen ( NO-3-N ) content and pH was compared in incubation experiment; and the effect of different NI on the dry matter quality, N uptake of citrus seedling was studied in pot experiment. The results showed that NI could significantly inhibit soil nitrification in the early culture period (p DMPP > En (calculated as nitrogen application rate). Application of NI increased the height and dry matter accumulation, N accumulation of citrus seedling grown in pot experiment. Thus, application of NI would be helpful for improving N use efficiency in purple soil which is one of major soil types for citrus production in China.
Highlights
China is the world with the largest citrus cultivation area and the largest production of citrus, accounting for 31% and 25% of the world respectively [1], which plays an important role in regulating the production and trade of citrus in the world
The content of treated by En decreased by 80.7%, dimethylpyrazole phosphate (DMPP) and DCD treatment decreased by 62.3% and 54.5% respectively, and the decrease of nitrification inhibitor treatment was significantly lower than that of CK treatment (p < 0.01)
Subsequent nitrification results in oxidation of the soil’s ammonium nitrogen to nitrate nitrogen, and H+ released during this process lead to a drop in soil pH [26], but the CK treatment due to rapid nitrification has the largest drop in pH and has been at the lowest level
Summary
China is the world with the largest citrus cultivation area and the largest production of citrus, accounting for 31% and 25% of the world respectively [1], which plays an important role in regulating the production and trade of citrus in the world. Fertilization is the important factors influencing the growth, yield and quality of citrus [2]. Nitrogen is the essential nutrient elements in the process of citrus growth. NH4+ -N and NO3− -N are the main source of nitrogen that can be utilized by citrus [3]. In the process of production, NO3− -N in the soil is lost with water, causing the low utilization rate of fertilizer, such problems as environmental pollution [4]. Predecessors’ Research Progress: Many countries have applied nitrification inhibitors to actual production, and nitrification inhibitors have played a very good role in reducing NO3− -N leaching, NO
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