关键词: 脲酶抑制剂, 硝化抑制剂, 有效态N, 微生物量N, 小麦N吸收

Abstract: Taking Wuan prefecture as an example,this paper summarizes the experiences in uplandagricultural development,because of which,grain and cotton productions per 1 mm precipitation reach to 520g and 70g,55% and 114% respectively higher than those of 10 years ago.The fundamental experiences are:(1)improve farmland basic construction with soil and waterconservation as a central task,(2)transform cropping system for reserving precipitation,(3)readjust crop arrangement and grow drought-resistant breeds,(4)popularize drought-reliefseeding techniques,(5)establish a complex ecological structure including agriculture,forestry and livestock farming.Problems in further strengthening agroecological constructionare discussed.

Key words: Urease inhibitor, Nitrification inhibitor, Available N, Microbial biomass N, N uptake of wheat