旱地土壤的合理施肥——Ⅶ.旱地土壤起始矿质氮与玉米对氮肥的反应  

Rational Application of Fertilizers on Drylands Ⅶ. The Correlation between Initial Nitrate in Dryland Soil and Maize Response to N Fertilizer

作　　者：李生秀[1] 高亚军[1] 胡田田[1] 杜建军[1] 巨孝堂 王喜庆[1] 

机构地区：[1]西北农业大学,陕西杨陵712100

出　　处：《干旱地区农业研究》1993年第S1期35-39,共5页Agricultural Research in the Arid Areas

基　　金：陕西省农牧厅资助项目

摘　　要：在澄城县旱塬6个肥力不同的田块进行的春玉米试验表明。土壤表层的铵态氮与玉米的吸氮量无密切关系,硝态氮虽与玉米吸氮量有一定关系,但相关系数低,难以作为土壤的供氮指标。盆栽试验和大田试验土壤中硝态氮和作极吸氮量的关系不同,主要在于大田中表层的硝态氮易随降水流入下层,因而难以反映其真正数值。采集0～100cm的深层土样,分层分析其铵、硝态氮含量,并计算深层土壤矿质氮和玉米吸氮量的关系,结果表明,0～100cm铵态氮总量虽然较高,仍与作物吸氮量无明显相关;相反,0～100cm的硝态氮与玉米吸氮量有密切关系,可以很好地反映旱地土壤的供氮水平。Field trials were conducted on 6 dryland fields with different soil fertilities in Chengchengcounty, using maize as indicating plant. The results obtained show that there was no closecorrelation between NH_4^+-N in the top soil and N uptake by plants. Although NO_3^- -N was wellcorrelated with plant uptake N, the correlation coefficient was not high enough as an index inreflecting soil nitrogen - supplying capacity. The differences of the relationships of nitrogenuptake with soil NO_3^- -N between pot experiment and field experiment were mainly caused bythat the NO_3^- -N in fleld might be leached away, and therefore its contents could not reflect itsreal level, while the NO_3^- -N in pot was still kept with no loss by leaching. Analysis of NO_3^- -N and NH_4^+ -N from 0 to 100 cm depth has shown that 0 to 100 cm NH_4^+ -N had still no goodcorrelation with plant uptake N, but the NO_3^- -N was well correlated with the N uptake byplants, being a good index in reflecting soil N-supplying capacities.

关 键 词：旱地 玉米 NO₃^--N NH₄⁺-N 相关 

分 类 号：S423[农业科学—植物保护]