Coupling Effects Of Irrigation Method With Nitrogen Fertilizer On Seedling Stage Of Maize (Zea Mays L.) Growth

This pot experiments with maize (Zea mays L.) of Xian Yu335were conductedto study the couple effects of four irrigation methods-FI(Full irrigation), DI (Deficitirrigation),DI�'FI(Deficit irrigation turns to Full irrigation) and PRD (Partialroot-zone drying irrigation),with the application of nitrogenous fertilizer on soil totalnitrogen content, soil available phosphorus content, pH value of soil, total nitrogenand phosphorus content in plant, plant dry weight,water using efficiency, Nutilization rate, as well as ABA content and stomatal density of leaf. Then the propersoil water content and nitrogenous fertilizer conditions are explored and the possiblemechanism is revealed. Main conclusions are as follows.1. Effects of irrigation methods and nitrogen application on soilphysicochemical property.Irrigation methods had an extremely significant effect on total soil nitrogencontent, soil available phosphorus content and soil pH value. Under no nitrogenousfertilizer was applied to compare the treatments on the total soil nitrogen content wasPRD>FI>DI>DI�'FI, and both of the soil available phosphorus content under PRDand DI treatments were significantly higher than FI treatment. While applyingnitrogenous fertilizer, the soil total nitrogen of DI and DI�'FI treatments wereobviously lower than FI by10.7%and14.2%respectively. The available phosphoruscontent of PRD was8%higher than FI, while DI and DI�'FI treatments were8%lower than FI.Applying nitrogenous fertilizer effected soil pH value significantly, effected soiltotal nitrogen and soil available phosphorus content extremely significantly. Nointeractive effect of irrigation method and nitrogenous fertilizer had been found. 2. Effects of irrigation methods and nitrogen application on maize, ABA contentand stomata.Irrigation methods effected stomatal density of leaf, ABA content, total plantphosphorus, total plant nitrogen, nitrogenous fertilizer, ratio of fresh and water useeffeciency extremely significantly; Nitrogenous fertilizer effected total plant nitrogensignificantly, effected dry weight, stomatal density and leaf ABA content extremelysignificantly; Irrigation method and nitrogenous fertilizer had significant interactiveeffect on water use efficiency, and had extremely significant interactive effect on leafABA content along with stomatal density.With or without nitrogenous fertilizer, total plant nitrogen of PRD treatmentwere higher than FI by47.8%and40.1%respectively, and total plant phosphorus ofDI, DI�'FI and PRD were higher than FI respectively by39.2%、19.6%、43.1%and35.1%、20.4%、79.6%. In all irrigation treatments, the leaf ABA content and stomataldensity of maize without nitrogenous fertilizer were higher, while water useefficiency were lower than that of plant applicated with nitrogenous fertilizer. Andthe nitrogen efficiency under PRD treatment was increased51%,61%and41.6%over than FI, DI and DI�'FI treatments respectively.