Effect Of Water And Fertilizer On Growth Yield And Quality Of Flue-cured Tobacco

Aiming at the problems such as drought of tobacco planting soil,uneven distribution of rainfall and low utilization efficiency of water and fertilizer,In this paper,by analyzing the data of meteorology and tobacco planting soil,the field experiment of tobacco was carried out in order to provide technical support for the establishment of regional flue-cured tobacco,water and fertilizer integration technology and the sustainable development of tobacco in Baise.The research contents are as follows:(1)Coupling degree and drought characteristics of flue-cured tobacco in 5 tobacco planting areas were analyzed(2)Jingxi is the analysis of the difference of physical and chemical data of tobacco planting soil.(3)Weight loss drip irrigation and different forms Effect of nitrogen fertilizer ratio test on flue-cured tobacco.The main results and conclusions are as follows:1、There was contradiction between water demand and precipitation in flue-cured tobacco growing period.Except Jingxi,the remaining four tobacco planting areas all had relatively high probability of water shortage and drought,which were concentrated in the extended root period and flourishing period of flue-cured tobacco.The coupling degree of water demand and rainfall was high in the mature period of flue-cured tobacco.Water and fertilizer irrigation should be concentrated in the early growth period of flue-cured tobacco and less fertilization in the later period to reduce the probability of drought and improve the utilization rate of fertilizer.The application of organic fertilizer and appropriate control of nitrogen should be strengthened in jingxi tobacco planting area to improve the soil environment of tobacco planting.2、In 2006,2012 and 2017,the organic matter content of tobacco planting soil in Jingxi city was generally high and rich,The content of total nitrogen,alkali hydrolyzable nitrogen and organic matter had a high correlation,and the content of total nitrogen and alkali hydrolyzable nitrogen increased with the increase of soil organic matter content.Under tobacco rice rotation,soil bulk density increased with the increase of planting years,while soil water content decreased with the increase of planting years.3、Drip irrigation could promote the growth and development of flue-cured tobacco,promote the appearance of cured tobacco,promote the accumulation of dry matter and chemical coordination,and improve the sensory quality of cured tobacco.When nitrate nitrogen: ammonium nitrogen =1:1 was adopted as topdressing,it was more conducive to the growth and development of tobacco plants in the early stage,and could effectively improve the yield and output value of tobacco leaves.