水氮耦合效应对贵州烟田土壤水分的影响

The effect of interaction of water and nitrogen on soil moisture in tobacco fiekds

采用两因素裂区设计试验,研究了水氮耦合对烟田土壤水分动态变化、水分利用率及水分产值率的影响。结果表明,氮肥用量在60-90 kg·hm^-2时,土壤各土层的含水量、贮水量、水分利用率、水分产值率随着氮肥用量的增加而增加,氮肥用量为90 kg·hm^-2时,水分利用率和水分产值率均达到最高,分别为4.26元/（mm·hm^2）和28.12元/（mm·hm^2）;氮肥用量在90-120 kg·hm^-2时,随着氮肥用量的增加,烟田土壤含水量、土壤贮水量和水分产值率逐渐降低。综合分析表明,补水条件下,90 kg·hm^-2的氮肥水平是贵州优质烤烟生产的最优水氮组合。

The interaction effects of water and nitrogen on soil water distribution, water use efficiency（WUE） and water value efficiency（WVE） in tobacco fields were studied by two-parameter splitting plot design experiment. The results indicated that with the increase of nitrogen within the range of nitrogen 60 - 90kg·hm^2, the soil moisture content, soil water holding capacity, WUE and WVE in all soil depth increased; But decreased when the amount of nitrogen application increased between 90 amd 120kg·hm^2 ;The highest value of WUE and WVE were obtained in the 90kg·hm^2 nitrogen application,corresponding to 4. 26Yuan/（ mm·hm^2） and 28. 12 Yuan/（ mm·hm^2） respectively; Based on the results indicated,90kg·hm^2 nitrogen fertilizer under water supplement is the best application strategy for good quality flue-cured tobacco production in Guizhou province.