Wetting Irrigation Water Nitrogen Coupling The Growth Of Cucumber

Humid irrigation technology is a new type of water-saving irrigation technologies, which isachieved by using humid irrigation equipment for various plants or crops, and make efficient use ofwater and nutrients. Humid irrigation device can obviously reduce soil water evaporation and setbarriers against infiltration and leaching of water and other nutrients by natural gravity flow. Amicro-environment was formed around a single cultivated plant. The soil moisture of the protectedregion was significantly higher than the unprotected areas; therefore, humid irrigation is a simple,water-saving and high efficiency utilization of nutrients compared to traditional cultivation techniques.In the present study, the coupling effect of water and nitrogen for cucumber under humid irrigationwas examined. This investigation was based on humid irrigation technology and traditional irrigationmethod in contrast, and sand culture pot and field experiments for cucumber were conducted,respectively. The obtained results showed that (1) at the same nitrogen level, growth and nutritionalcharacteristics such as plant height of the cucumber seedling cultivated using humid irrigation deviceare much higher than those by the traditional method, and there were extremely significant differencesbetween these two methods. (2) using the new technique, the optimal nitrogen supply, i.e. 160 mg / Lwas found in this study. A good correlation was obtained among the net photosynthetic rate,transpiration rate, intercellular carbon dioxide concentration and stomatal conductance while thephotosynthetic characteristics of the third leaf on the 24th day were measured. The obtained rerultsshowed that the humid irrigation was better than the traditional method in water utilization efficiency.(3)humid irrigation technology can obviously delay leaf senescence of cucumber seedlings, andcaused a higher biomass of plants compared to traditional method by the activities of both SOD andCAT enzymes.(4)at the same nitrogen level, the maximum cucumber yield per individual plantusing the new technique was 5.08% higher than that by the traditional method, and the optimalirrigated water and nitrogen combination, i.e. 900 mg / L was obtained at ripeness stage of cucumberin the field test.