作者：
摘要：<正> Field experiments were conducted to study cotton nitrogen diagnosis and topdressing recommendation by measuring cotton tissue NO3- concentration with Reflectoquant. Results showed that the order of NO3- concentration in different cotton plant tissues is petiole > stem > leaf, and upper parts> lower parts. There was significant change in each growth period, which was, NO3- concentration in budding-blooming period was the highest whereas it was the lowest in full blooming period. NO3- concentration in the 4th expanding petiole is relatively stable and can sensitively indicate cotton nitrogen state so it was chosen as diagnosis tissue. NO3- content in budding-blooming period was significantly correlated with seed-cotton yield so it was chosen as diagnosis period. Primary cotton’s nitrogen diagnosis index and amount of topdressing was formulated by regression of NO3- concentration against seed-cotton yield. It was not only rapid and accurate but also time-saving and flexible by using Reflectoquant to diagno
关键词：Cotton;N nutrition diagnosis;Topdressing recommendation;
文献注录：. Study on Cotton Nitrogen Diagnosis and Topdressing Recommendation in North Xinjiang,China [J]. Agricultural Sciences in China. 2002, 12: 60-66.
报/刊名：《Agricultural Sciences in China》，发表于2002 / 第 12 期。
文献类型： [J] （文献级别：核心刊物）
页码：第 60-66 页 / 共7 页