Effects of fertigation scheme on N uptake and N use efficiency in cotton  

作　　者：Zhenan Hou Pinfang Li Baoguo Li Jiang Gong Yanna Wang 

机构地区：[1]Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100094, China [2]Department of Resources and Environmental Sciences, Shihezi University, Shihezi Xinjiang 832003, China Present Address

出　　处：《新疆农业科学》2008年第A02期65-76,共12页Xinjiang Agricultural Sciences

基　　金：国家科技支撑计划项目"棉花持续优质高效生产技术体系研究与示范"(2006BAD21B02);新疆维吾尔自治区"十一五"重大科技专项"棉花生产关键技术开发,集成与示范"(200731133);the National Natural Science Foundation of China (grant no30460062);the Program for Changjiang Scholars and Innovative Resaerch Team in the University (grant noIRT0412);the Key Teacher Foundation of Shihezi University (grant noNX02002)

摘　　要：While fertigation can increase fertilizer use efficiency, there is an uncertainly as to whether the fertilizer should be introduced at the beginning of the irrigation or at the end, or introduced during irrigation. Our objective was to determine the effect of different fertigation schemes on nitrogen (N) uptake and N use efficiency (NUE) in cotton plants. A pot experiment was conducted under greenhouse conditions in year 2004 and 2005. According to the application timing of nitrogen (N) fertilizer solution and water (W) involved in an irrigation cycle, four nitrogen fertigation schemes [nitrogen applied at the beginning of the irrigation cycle (N-W), nitrogen applied at the end of the irrigation cycle (W-N), nitrogen applied in the middle of the irrigation cycle (W-N-W) and nitrogen applied throughout the irrigation cycle (N&W)] were employed in a completely randomized design with four replications. Cotton was grown in plastic containers with a volume of 84 l, which were filled with a clay loam soil and fertilized with 6.4 g of N per pot as unlabeled and 15N-labeled urea for 2004 and 2005, respectively. Plant total dry matter (DM) and N content in N-W was significantly higher than in N&W in both seasons, but these were not consistent for W-N and W-N-W treatments. In year 2005, a significantly higher nitrogen derived from fertilizer (NDFF) for the whole plant was found in W-N and N-W than that in W-N-W and N&W. Fertigation scheme had a consistent effect on total NUE: N-W had the highest NUE for the whole plant, but this was not significantly different from W-N. Treatments W-N and W-N-W had similar total NUE, and N&W had the lowest total NUE. After harvesting, the total residual fertilizer N in the soil was highest in W-N, lowest in N-W, but this was not significantly different from N&W and W-N-W treatments. Total residual NO3-N in the soil in N&W and W-N treatments was 20.7 and 21.2% higher than that in N W, respectively. The total 15 N recovery was not statistically significant between the four fertigation schemeWhile fertigation can increase fertilizer use efficiency, there is an uncertainly as to whether the fertilizer should be introduced at the beginning of the irrigation or at the end, or introduced during irrigation. Our objective was to determine the effect of different fertigation schemes on nitrogen （N） uptake and N use efficiency （NUE） in cotton plants. A pot experiment was conducted under greenhouse conditions in year 2004 and 2005. According to the application timing of nitrogen （N） fertilizer solution and water （W） involved in an irrigation cycle, four nitrogen fertigation schemes [nitrogen applied at the beginning of the irrigation cycle （N-W）, nitrogen applied at the end of the irrigation cycle （W-N）, nitrogen applied in the middle of the irrigation cycle （W-N-W） and nitrogen applied throughout the irrigation cycle （N＆W）] were employed in a completely randomized design with four replications. Cotton was grown in plastic containers with a volume of 84 l, which were filled with a clay loam soil and fertilized with 6.4 g of N per pot as unlabeled and 15N-labeled urea for 2004 and 2005, respectively. Plant total dry matter （DM） and N content in N-W was significantly higher than in N＆W in both seasons, but these were not consistent for W-N and W-N-W treatments. In year 2005, a significantly higher nitrogen derived from fertilizer （NDFF） for the whole plant was found in W-N and N-W than that in W-N-W and N＆W. Fertigation scheme had a consistent effect on total NUE： N-W had the highest NUE for the whole plant, but this was not significantly different from W-N. Treatments W-N and W-N-W had similar total NUE, and N＆W had the lowest total NUE. After harvesting, the total residual fertilizer N in the soil was highest in W-N, lowest in N-W, but this was not significantly different from N＆W and W-N-W treatments. Total residual NO3-N in the soil in N＆W and W-N treatments was 20.7 and 21.2% higher than that in N W, respectively. The total 15 N recovery was not statist

关 键 词：棉花 加肥灌溉 田间管理 氮元素 

分 类 号：S562[农业科学—作物学]