高低土壤肥力條件下烤煙對氮素吸收,、分配和利用的研究
Studies on Nitrogen Absorption, Distribution and Utilization in Flue-cured Tobacco under Higher and Lower Fertility Conditions
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摘要: 在費縣褐土煙田,，運用15N示蹤技術(shù)研究了高低土壤肥力條件下烤煙對不同來源氮素的吸收、分配及利用,。結(jié)果表明,，在高低土壤肥力條件下，烤煙吸收的土壤氮量多于吸收的肥料氮量,，烤煙吸收的氮素18.67%～29.32%來自于肥料,，70.68%～81.33%來自于土壤。隨生育進程,，肥料氮占總氮的比例呈降低趨勢,，土壤氮比例呈增加趨勢。在生育前期,，低肥力土壤煙株吸收的肥料氮和土壤氮量高于高肥力土壤,；在生育中后期，趨勢相反,?？緹煶墒爝^程中，莖的氮素積累量和分配比例增加,，葉片的氮素積累量和分配比例降低,，高肥力條件下莖的氮素分配比例增加幅度和葉片的氮素分配比例降低幅度均高于低肥力的。低肥力土壤煙株的氮肥利用率為8.81%～11.20%,，高肥力土壤煙株的氮肥利用率為3.00%～16.76%,。Abstract: Nitrogen uptake of different parts of flue-cured tobacco under different fertility condition by using 15N tracer technique was studied. Results showed that flue-cured tobacco took up more N from soil than from N fertilizer, and 18.67%-29.32% of N absorbed by flue-cured tobacco was derived from N fertilizer, 70.68%-81.33% from soil under two level fertility fields. Compared with the higher fertility field, the amount of fertilizer N and soil N absorbed by flue-cured tobacco was higher at the earlier stage. But there were the reverse trends at the midterm and late stage. During the maturity, the nitrogen accumulation amounts and distribution proportion of stem increased and the nitrogen accumulation amounts and distribution proportion of leaves decreased. The distribution proportion increasing extent of stem and decreasing extent of leaves were higher in higher soil fertility than in lower soil fertility. The nitrogen utilization efficiency (NUE) under lower fertility field was from 8.81% to 11.20%, and the NUE under higher fertility field was from 3.00% to 16.76%.
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