CAJ | 학술논문

通过室内入渗试验，研究了膜孔灌条件下不同氮肥的转化特性。结果表明，施入铵态氮肥后土壤铵态氮含量在膜孔中心垂向表层0～5．5 cm内变化，再分布15 d土壤铵态氮损失了68％，再分布20 d铵态氮基本完全转化；随再分布时间的延长，硝态氮的含量在土壤表层10 cm范围内逐渐增加，在10 cm以下，硝态氮的含量7 d前先增大再减小，7 d后一直增大。施入硝态氮肥后，硝态氮含量7 d内变化很小，7～10 d内明显减少，10 d以后减少缓慢。施入尿素后，土壤中铵态氮在5 d后达到峰值，20 d后下降至土壤的本底值；而土壤硝态氮一直平稳升高，于施肥20 d后达到最大值；土壤铵态氮含量和硝态氮含量均沿着远离膜孔中心的方向逐渐减小。
통과실내입삼시험，연구료막공관조건하불동담비적전화특성。결과표명，시입안태담비후토양안태담함량재막공중심수향표층0～5．5 cm내변화，재분포15 d토양안태담손실료68％，재분포20 d안태담기본완전전화；수재분포시간적연장，초태담적함량재토양표층10 cm범위내축점증가，재10 cm이하，초태담적함량7 d전선증대재감소，7 d후일직증대。시입초태담비후，초태담함량7 d내변화흔소，7～10 d내명현감소，10 d이후감소완만。시입뇨소후，토양중안태담재5 d후체도봉치，20 d후하강지토양적본저치；이토양초태담일직평은승고，우시비20 d후체도최대치；토양안태담함량화초태담함량균연착원리막공중심적방향축점감소。
Based on lab experiment ,transformation characteristics of nitrogen under film hole single point infil-tration with different nitrogen fertilizer were researched .Results showed that the transformation laws of nitrogen un-der different nitrogen fertilizer were different .The NH4+-N content at the vertical of film hole center changed in the depth of 0-5.5 cm after fertilization with ammonium fertilizer .The NH4+-N content lost 68%after redistribution of 15 d and it was transformed completely after redistribution of 20 d.With the redistribution time increased ,the con-tent of NO3--N increased in the 10 cm scope of soil surface layer .Below the 10 cm scope of soil surface layer ,the content of NO3--N first increased and then decreased in 7 d and it always increased after 7 d.The content of nitrate fertilizer changed little in 7 d after fertilization with nitrate nitrogen fertilizer ,but it decreased obviously in 7-10 d and it decreased slowly after 10 d.The NH4+-N content came to the maximum value in 5 d after fertilization of urea and decreased to the background value in 20 days.While the NO3--N content increased all along and came to the maximum value in 20 days after fertilization.The soil NH4+-N content and NO3--N content under fertilization de-creased with the distance far from the film hole center .The results lay a foundation for study of film hole irrigation fertilizer technique .