Effect of Topdressing Nitrogen on Leaf Chlorophyll Content, Agronomic Characters and Yield of Jigu 16
Yang Yanbing
Qin Ling
Chen Erying
Liu Bin
Zhang Huawen
Wang Hailian
Guan Yan’an
Abstract：In order to confirm the optimal application amount of nitrogen for foxtail millet cultivar Jigu 16,7 levels of urea were designed as 0,5,10,15,20,25 and 30 kg per 666.7m2 for topdressing at booting stage in this experiment.The SPAD value of the top four leaves was determined with SPAD -502 (Konica Mi-nolta)every 7 days after heading;the plant height,stem diameter,panicle length,panicle diameter,grain weight per spike,1 000 -grain weight and yield of every plot were measured in mature period.The results showed that the chlorophyll content of the same place leaves,plant height,stem diameter,panicle length, panicle diameter,dry weight of single plant and 1 000 -grain weight were not significantly different between different nitrogen levels.Topdressing nitrogen increased the yield and grain weight per spike,which were the highest when topdressing 10 kg nitrogen per 666.7m2 ,and increased by 17.31% and 13.02% respectively compared to no topdressing.Therefore,topdressing 10 kg urea at booting stage was optimum under this experi-ment conditions for foxtail millet varieties with 350 ~400 kg grain yield per 666.7m2 .
Keywords：Foxtail milletTopdressing nitrogenChlorophyll contentAgronomic charactersYield
Publication Date：2015-12-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 63-66 )