Abstract: In order to explore the effect of different forms of nitrogen supply on flue-cured tobacco's curing characteristics. A field experiment,using K326(Nicotiana tabacum L.)as experimental material,with five different forms of nitrogen supply that N1(100% nitrate nitrogen),N2(30% ammonia nitrogen + 70% nitrate nitrogen),N3(50% ammonia nitrogen + 50% nitrate nitrogen),N4(70% ammonia nitrogen + 30% nitrate nitrogen)and N5(100% ammonia nitrogen)were conducted to study the effects of different treatments water,chlorophyll,polyphenol oxidase and malondialdehyde contents in leaves of tobacco leaves were compared,and the economic characters of flue-cured tobacco leaves were compared.The results showed that different nitrogen supply had different effects on the baking characteristics of flue-cured tobacco under 165 kg/ha nitrogen application rate.The water loss rate of tobacco leaves treated with 30% ammonia nitrogen+70% nitrate nitrogen during the curing process was close to the mean value of the water loss rate in 72 hours,and the chlorophyll degradation rate and the water loss rate was coordinated and synchronized.The activity of polyphenol oxidase in tobacco leaves was the lowest,the accumulation of malondialdehyde was slow and the membrane lipid peroxidation level was the lowest.In addition,the treatment of 30% ammonia nitrogen+70% nitrate nitrogen had the proportion of high-grade tobacco and the highest value.It could be seen that the tobacco leaf curing characteristics and leaf quality could be obtained by using 30% ammonia nitrogen+70% nitrate nitrogen in the northern part of Guangdong.

Key words: Forms of nitrogen supply, Flue-cured tobacco, Curing characteristics, Tobacco quality

CLC Number: 

• S572.01

• S143.1