新疆农业科学2013，Vol.50Issue(5)：875-881,7.DOI:10.6048/j.issn.1001-4330.2013.05.014
滴灌施肥条件下不同土层硝态氮的分布规律
Distribution of Nitrate Nitrogen in Different Soil Layers under Drip Fertigation
摘要
Abstract
[Objective] Simulation of drip fertigation on the specified field was carried out and the regularities of nitrate nitrogen distribution of different irrigation and nitrogen was discussed.[Method] Four irrigation were set as 27 (W1),54 (W2),81 (W3) and 108 (W4) mm ; four nitrogen application rates were set as 0 (N0),52.5 (N1),105 (N2),157.5 (N3) kg/hm2,and among them zero rate meant that only water was irrigated without nitrogen.[Results] The results indicated that when the irrigation amount reached 81 mm and 108 mm,significant amount of residual soil nitrate was found in the 70 cm soil layers,which would result in the eluviation.The normal irrigation (54 mm),lower or higher than the conventional treatment (52.5 kg/ hm2) would also lead to significant nitrate decrease in the same soil depth.[Conclusion] In the normal irrigation condition,different nitrogen treatments of nitrate nitrogen content in the vertical direction decreased with the increase of soil depth,residual nitrate at 70 cm was N1 ＜ N2 ＜ N3 ; the average content of nitrate nitrogen decreased slowly in 0-30 cm in horizontal direction in soil,and there was no accumulation phenomenon at the soil wetness peak.In the conventional nitrogen condition,nitrate nitrogen content in the vertical direction decreased with the increasing soil depth under the W1 (27 nun) and W2 (54 mm) treatment,mainly in the 0-30 cm soil laver.While nitrate nitrogen average content increased vertically in soil under the W3 (81 mm)and W4(108 mm)treatment,and residual nitrate at 70cm was W3 ＜ W4,nitrate nitrogen would leak down.The increase of irrigation volume would also lead to the phenomenon of accumulation of nitrate nitrogen near the soil wetness peak.关键词
滴灌施肥/灌水施肥量/土层剖面/硝态氮累积Key words
dripping fertigation/ irrigation volume/ soil profile/ accumulation of nitrate nitrogen分类
农业科技引用本文复制引用
杨梦娇,吕新,侯振安,陈剑,张泽..滴灌施肥条件下不同土层硝态氮的分布规律[J].新疆农业科学,2013,50(5):875-881,7.基金项目
国家高技术研究发展计划("863"计划)"棉花规模化生产精准作业技术与装备"(2012AA101902) （"863"计划）
国家科技支撑计划"棉花田间精准作业技术规模化与示范"(2012BAD41B02) （2012BAD41B02）
