Title

旱地農田生態系統氮肥利用率的評價

Translated Titles

Estimation of Nitrogen Fertilizer Use Efficiency in Dryland Agroecosystem

Authors

李世清(Shi-Qing Li);李生秀(Sheng-Xiu Li)

Key Words

旱地農業 ; 農田生態系統 ; 氮肥利用率 ; 後效 ; Dry farming ; Ecological system of farmland ; Nitrogen fertilizer recovery ; Residual effect

PublicationName

中國農業科學

Volume or Term/Year and Month of Publication

33卷1期(2000 / 02 / 01)

Page #

76 - 81

Content Language

簡體中文

Chinese Abstract

在楊淩中等肥力紅油土上進行的連續4季大田試驗表明,旱地農田生態系統中氮肥僅在第1季作物産量和吸氮量上表現出突出的效果,而且還有較長的後效,可持續到第4季物上。當季氮肥利用率平均31.7%,4季疊加利率63.3%,後者是前者的2倍,施氮量愈高,加利用率與當季利用率間的差別更大。這表明僅用當季作物氮肥肥效難以客觀可靠評價氮肥利用率,應當把後效考慮在內。

English Abstract

A field trial was carried out to study the nitrogen fertilizer recovery by four crops in sussession in manual loess soil in Yangling. The results show that the nitrogen fertilizer had the significant effects on the first crop and long residual effects, even on the fouth crop. The average apparent nitrogen N fertilizer recovery by the first crop was 31.7%, and the accumulative N recovery by the 4 crops was high as 62.3%, and the latter was double as the former. It is quite clear that the nitrogen fertilizer recovery by the first crop was not reliable for estimating the N fertilizer use efficiency unless the residual effect of N fertilizer was included.

Topic Category 生物農學 > 農業
生物農學 > 森林
生物農學 > 畜牧
生物農學 > 漁業