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在盆栽条件下采用15N示踪方法研究结晶有机肥、尿素和烟用复合肥在土壤植株系统中的分布规律。结果表明 ,结晶有机肥比尿素增产 2 3.1%,比复肥增产 14.6 %,达 1%显著水准。复肥比尿素增产 8.5 %,达 5 %显著水准。烟株全N量 :有机肥处理是复肥处理的 138.6 %,是尿素处理的 145 .7%;而复肥处理是尿素处理的10 5 .1%。从肥料中吸收的N量 :结晶有机肥处理比复肥处理多 2 5 .1%,比尿素处理的多 2 7.9%。从土壤中吸收的N量 :结晶有机肥处理比复肥处理多 47.4%,比尿素处理多 5 8.3%;而复肥处理比尿素处理多 7.4%。N肥利用率 :结晶有机肥处理为 45 .8%,比复肥和尿素处理分别高 9.4和 10 .1个百分点。所施N的回收率 :结晶有机肥处理达 98.3%,比复肥和尿素处理分别高 7.7和 12 .8个百分点 ,而复肥比尿素处理高 5 .1个百分点。结晶有机肥省肥增产的主要原因是剌激作物从土壤N库中吸收了较多N素 ,同时所施N肥的利用率明显提高。
The 15N tracing method was used to study the distribution of crystalline organic fertilizer, urea and tobacco compound fertilizer in the soil plant system under potted condition. The results showed that the yield of crystalline organic fertilizer was 2131% higher than that of urea and 14.6% higher than that of compound fertilizer, reaching a significant level of 1%. Compounded urea output increased by 8.5% than urea, up to 5% significant level. Total N content of tobacco plants: organic fertilizer treatment is compound fertilizer treatment of 138.6%, 145.7% of urea treatment; and compound fertilizer treatment is 105.1% of urea treatment. The amount of N absorbed from fertilizers: Crystallized organic fertilizer was 25.5% more than compound fertilizer and 2 7.9% more than urea. The amount of N absorbed from the soil: the organic manure treatment was 47.4% more than the compound fertilizer treatment, more than 8.35% more than the urea treatment, whereas the compound fertilizer treatment was 7.4% more than the urea treatment. N fertilizer use efficiency: 45.8% of organic fertilizer treatment, compared with compound fertilizer and urea treatment were 9.4 and 10.1 percentage points higher. N recovery rate applied: the treatment of organic fertilizer reached 98.3%, which was 7.7 and 12.8% higher than that of the compound fertilizer and urea treatment respectively, while the compound fertilizer was 5.1% higher than the urea treatment. The main reason for the increase in yield of organic fertilizer by organic fertilizer is that the stimulated crop absorbs more N from the soil N pool and the utilization rate of N fertilizer is obviously increased.