中国北方甜菜土壤碱解氮丰缺指标与适宜施氮量研究

Abundance-deficiency Index of Soil Alkaline Hydrolysis Nitrogen and Appropriate Nitrogen Application Rates for Sugar Beet in North China

为了给甜菜测土施肥提供科学依据,采用零散实验数据整合法、土壤养分含量与缺素处理相对产量回归方程法和"养分平衡—地力差减法"确定适宜施肥量新应用公式,开展了我国北方甜菜土壤碱解氮丰缺指标与适宜施氮量研究。结果表明,中国北方甜菜土壤碱解氮第2～6级丰缺指标依次为>429、115～429、31～115、9～31和≤9 mg/kg。当氮肥当季利用率40%、目标产量30～90 t/hm^2时,土壤碱解氮丰缺级别第2～6级的适宜施氮量范围依次为34～101、68～203、101～304、135～405和169～506 kg/hm^2。

To provide a scientific basis for sugar beet soil testing and fertilizer recommendation, the study of the abundance -deficiency index (ADI) of soil alkaline hydrolysis nitrogen (SAHN) and the appropriate nitrogen application rates (ANAR) for sugar beet in the north of China were carried out. The methods of scattered experimental data integration, regression equation between soil nutrient content and relative yield of one nutrient deficient treatment, and the new applied formula based on "nutrient balance and projected yield minus soil fertility yield" for determining the appropriate fertilizer application rates were employed. The results showed that the ADI of SAHN for sugar beet in the north of China from the second to sixth level were >429, 115-429, 31115, 9-31 and ^ 9 mg/kg, respectively. When the nitrogen fertilizer use efficiency in current season was 40%, and the projected yield of sugar beet was 30-90 t/ha,the suitable SAHN rates for the second to sixth level soil were in ranges 34-101, 68-203, 101-304, 135-405 and 169-506 kg/ha, respectively.