Effects Of Different Irrigation Motheds On Yield And Quality Of Flue-cured Tobacco

To study the effects of irrigation methods on growth, yield and quality of flue-cured tobacco, four treatments of furrow irrigation (CK), alternate furrow irrigation, rocker type sprinkler, and drip irrigation were conducted at Jinyeyuan in Fangcheng County of Henan Province in 2008. The results were as follows:1 Effects of different irrigation methods on soil physical and chemical propertiesCompared with CK, all treatments were better in soil compaction, bulk density and porosity, sprinkler irrigation and drip irrigation were second, followed by the turn of every furrow irrigation;Available nitrogen, phosphorus and potassium penetrated into the soil deeper by furrow irrigation and alternate furrow irrigation, sprinkler irrigation and drip irrigation, but in the horizontal direction available nitrogen, phosphorus and potassium were much easier to be gathered at the roots of tobacco and reduced the leaching of fertilizers and improved fertilizer utilization by sprinkler and drip irrigation.2 Effects of different irrigation methods on geotemperature of flue-cured tobacco fieldThe changing range of field geotemperature at 0-10 cm soil layer was great, and deeper soil temperature was flat; Compared to CK , the average temperatures per day at 0-25 cm soil layer of alternate furrow irrigation, sprinkler irrigation and drip irrigation were improved, and drip irrigation was most obvious, followed by spray irrigation, alternate furrow irrigation slightly reduced.3 Effects of different Irrigation methods on botanical characters of flue-cured tobaccoThe whole growth of alternative furrow irrigation than CK, but the growth of sprinkler and CK were equivalent, and drip irrigation were stronger growth than CK. Sprinkler and drip irrigation could increase the effective number of leaf and leaf area per plant, and drip irrigation could significantly increase stem girth of flue-cured tobacco.4 Effects of different irrigation methods on dry matter accumulation of flue-cured tobaccoThe dry matter accumulation of furrow irrigation and drip irrigation were more than other treatments at the early stage; Compared to the control the dry matter accumulation of othe treatments were superior at the topping-out period, the turn of every furrow irrigation, sprinkler irrigation and drip irrigation of dry matter at the roots of the control distribution ratio greater than that of the three strains of tobacco treatment could promote the development of root system, and the distribution dealing with stalking of dry matter was lower than CK., sprinkler irrigation and drip irrigation on dry matter distribution in the leaf were greater than CK ,which would improve production.5 Effects of different irrigation methods on the carbon containing compounds and nitrogen containing compounds of flue-cured tobaccoSprinkler and drip irrigation have advantaged on carbon assimilation at the early stage, and accumulation and transformation of carbon compounds was in time at squaring period. NR activity, total nitrogen, protein and nicotine content of the treatments decreased as the promotion of growth and development, and sprinkler irrigation and drip irrigation were highest at over luxuriant growth stage, whereafter it decreased quickly, which will help nitrogen metabolism of tobacco into line, and alternative furrow irrigation and micro-sprinkler droping were less than CK, indicating transformation of both carbon and nitrogen metabolism were later than CK.6 Effects of different ways on irrigation water used efficiency of flue-cured tobaccoCompared to the control, use efficiency of water consumption output value of alternative furrow irrigation , sprinkler irrigation and drip irrigation were increased, the water use efficiency of which increased by 15.57%, 17.64% and 21.41%, and water consumption per unit the output value increased by 1.34%, 26.28% and 31.90%. Sprinkler and drip irrigation improved the effectiveness significantly.7 Effects of different irrigation methods on economic characters of flue-cured tobaccoThe economic characters of alternative furrow irrigation of flue-cured tobacco were significantly lower than the control, and sprinkler and drip irrigation would significantly improve the economic efficiency of flue-cured tobacco. It was worth popularizing in the water supply on a flue-cured tobacco production.8 Effects of different irrigation methods on the cost-effectiveness comparison of flue-cured tobaccoThe costs of inputs of facilities in 3 treatments were 7-8 times higher than furrow irrigation, but the labor and water consumption were much lower than the furrow irrigation. What's more, the effectiveness of alternative furrow irrigation was lower than CK by 3996.16 yuan ? hm-2, and sprinkler and drip irrigation increased effectiveness by 1226.00 yuan ? hm-2 and 2305.61 yuan ? hm-2, so sprinkler and drip irrigation would not only be able to reduce labor in tobacco fields and irrigation, but also enhance tobacco quality. So the economic benefits were sprinkler irrigation and drip irrigation.9 Effects of different irrigation methods on the chemical constituents of flue-cured tobaccoCompared to the control, all treatments could improve carbon and nitrogen compounds and potassium content on flue-cured tobacco in some degrees, and reduce chlorine ions contents. Altogether the intrinsic chemical composition of flue-cured tobacco in the sprinkler and drip irrigation was harmonious, especially in improveing potassium.10 Effects of different irrigation methods on aroma neutral substances of flue-cured tobacco The phenylalanine, phenylalanines, cembranenoides and browing reaction products of three types of neutral aroma substances were not significant different, and the carotenoid content and total aroma constituents of furrow irrigation, sprinkler irrigation and drip irrigation was significantly higher than the turn of every furrow irrigation and micro - sprinkler irrigation.