棉 花 学 报     Cotton Science   2007，19(3)：239-封三

Research in Nitrogen Fertilization Recommendation Base on Plant of Two Cotton Genotypes
ZHONG Gui-jun^1，2，TIAN Chang-yan^1*，FENG Gu³，MA Ying-jie¹
(1.Xinjiang Institute of Ecology and Geography，Chinese Academy of Sciences，Urumchi 830011，China ；2.The Graduate Schoo1，Chinese Academy of science，Beijing 100039，China；3. College o f Resources and Environment，China Agricultural University，Beijing 100094，China )

Abstract：Under drip irrigation condition，field experiments were conducted to study two different cotton genotypes nitrogen diagnosis and topdressing recommendation by measuring NO₃ concentration of the fourth expanding petiole with Reflectoquanto. The results showed：that the petiole nitrate concentration in two cotton genotypes was significantly positive correlated with rates of N applied and yields. It was unnecessary to take the genotypic difference into account in a reasonable nitrogen topdressing and high fertility field.
Key words：cotton；genotype；nitrogen fertilizer recommendation；plant；nitrate concentration  
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