基施尿素对片麻岩新成土旱地谷子生长及土壤硝态氮时空分布的影响  

Effect of basal application of urea on the growth of millet and spatial-temporal distribution of nitrate nitrogen

作　　者：李向文[1,2] 王红[2] 张爱军[2] 张瑞芳[2] 周大迈[2] 

机构地区：[1]河北农业大学资源与环境科学学院,河北保定071001 [2]河北农业大学山区研究所、国家北方山区农业工程技术研究中心,河北保定071001

出　　处：《干旱地区农业研究》2012年第5期128-132,142,共6页Agricultural Research in the Arid Areas

基　　金：河北省自然科学基金项目(C2009000565)

摘　　要：本试验在片麻岩新成山地土壤上，设置O（cK）、N120ke／hm2（N120）、N225k∥hm2（N225）、N300ke,／hm2（N300）4个施氮水平，布置田间微区试验，小区面积为10m2，研究了尿素不同施用量对旱地谷子生长及土壤硝态氮时空分布的影响。定位试验第二年的结果表明：在该试验条件下，N120处理谷子产量达到最高为4．76kg/0m2，之后提高施肥量N225和N300处理的谷子产量并没有显著增加；从0～60em土壤剖面中硝态氮时空分布的差异可以看出：在施肥20d后，N120、N225和N300处理N03一一N含量在0～40cm土层显著增加，其中N225和N300处理N03一一N已经下移到40～60cm土层。施肥80d后，各施肥处理的硝态氮有一部分已经移出60cm土层。到施肥96d（谷子收获），N120、N225和N300处理比CK处理土壤剖面中NO，一一N含量显著增加，且氮肥用量越高，土壤中NO，一一N含量越高。A field experiment was conducted in the gneiss Entisols to study the effect of different application of urea on the growth of millet and spatial-temporal distribution of nitrate nitrogen. A field micro-plot of l0 m2 experiment with four levels of nitrogen fertilizer treatments： 0（CK）, 120 kg/hm2 （N120）, 225 kg/hm2 （N225）, 300 kg/hm2 （ N300）, was conducted. The results on a 2-year-term location experiment showed that under this experiment condition, the yield of N120 treatment reached the highest of 4.76 kg/10m2, while the high rates of N application from N225 to N300 did not significantly increase millet yield. Based on the difference of nitrate nitrogen distribution in 0 ～ 60 cm soil profile, the content of NO3 - - N increased significantly by N120, N225 and N300 fertilizer treatment in 0 ～ 40 cm layer, especially the NO3 - - N of N225 and N300 was moved down to 40 ～ 60 cm layer after fertilization for 20 days. The NO3 - - N had exceeded below 60 cm layer in each fertilizer treatment after fertilization for 80 days. The NO3 - - N content by N120, N225 and N300 increased more significantly than CK after fertilization for 96 days （millet harvest）, and the accumulation of NO3 - - N in soil increased with the increase of fertilizer.

关 键 词：尿素 片麻岩 硝态氮淋洗 谷子 

分 类 号：S158.5[农业科学—土壤学]