两种灌溉方式下保水剂用量对春播裸燕麦土壤氮素的影响

Effects of super absorbent polymer application rate on soil nitrogen of spring-sown naked oat in two irrigation systems

在大田条件下,采用裂区设计,研究了传统灌溉和滴灌两种灌溉方式下4个保水剂用量(0,30,60和90kg/hm2)对春播裸燕麦土壤氮素的影响。结果表明,随保水剂用量的增加,裸燕麦土壤全氮、硝态氮、铵态氮含量呈先增加后减少的趋势,以施用60kg/hm2保水剂的处理全氮、硝态氮、铵态氮含量最高。相同保水剂用量条件下,滴灌处理的土壤全氮、硝态氮、铵态氮含量均高于传统灌溉处理。传统灌溉易造成土壤硝态氮向下淋洗,不利于燕麦对氮素的吸收利用。适当灌溉定额的滴灌(春播140mm)有利于增加土壤耕层氮素营养。

The present study, was a split plot field experiment to investigate the variation of soil nitrogen of spring-sown naked oat （Arena nuda） and four levels of super absorbent pol absorbent polymer, the content of soi under two irrigation systems （traditional irrigation and drip irrigation） ymer （0, 30, 60 and 90 kg/ha）. With an increase of the amount of super 1 total nitrogen, soil nitrate nitrogen and ammonium nitrogen initially in- creased but then decreased. The contents of soil total nitrogen, soil nitrate nitrogen and ammonium nitrogen reached their highest levels when SAP application was 60 kg/ha, and the contents under drip irrigation were higher than under traditional irrigation with the same levels of super absorbent polymer. Traditional irrigation caused soil nitrate to leach down, but was not conducive to absorption of nitrogen while an appropriate irrigation quota of drip irrigation （spring-sown was 140 mm） was beneficial for increasing soil tilth nitrogen.