Study On Soil Moisture Dynamics Of Cucumber Root Under Drop Irrigation In The Greenhouse

The soil water is the most direct and important headwaters in theagriculture production. Generally, the rainfall and the irrigation water just beconverted into the soil water first, and then can be absorbed by the farmcrop. The soil humidity research is an important research content of the soilphysics. The quantity of soil water acts as a key role in the planting andgrowth of the crop. Therefore, research on the soil water, realize thedynamic state variety regulation of the soil humidity have a greatsignificance to create a feat growth humidity environment for the crop.Drop irrigation is one of the most advanced techniques in save waterirrigation nowadays. Under the condition of right system design andmanagement of the farm crop humidity irrigation, the drop irrigation systemcan carry on the irrigation just the right amount in good time, creating a featwater,fertilizer,gaseity and temperature condition in an area of the crop root,in order to save water, and acquire high produce, superior quality. Thereasonable application of drop irrigation system will bring the larger watersaving for the glasshouse planting. The drop irrigation belong to the partirrigation, its moist scope is small, the moist depth is shallow, can avoid deepseep. For satisfying the crop water requirement, we must know theambulation regulation of the water, which come from the drop irrigation.The adoption of drop irrigation in the glasshouse, not only can raise theexploitation level of soil water, fertilizer, gaseity, hotting condition etc., butalso can lower the degree of the indoor humidity effectively, benefit in thegrowth of the crop. Study on dynamic characteristic of glasshouse soil water,has important realistic meaning in that, how irrigation condition influence thesoil humidity in particular environment, and to realize the dynamiccharacteristic of glasshouse water, thus to guide the agriculture activity, asfertilization and water irrigation etc.Along with the technical application of the facility agriculture watersaving, under the condition of drop irrigation, it's seem to be particularlyimportant that the control of soil humidity and nutrients losing from the rootarea of corp. That to realize the condition of root department absorbingwater and the dynamic state of soil humidity consuming accurately, isbeneficial to establish irrigation system reasonably and ensure theagriculture to save water as well as have a high and steady produce.The cucumber is a kind of vegetable, which need large amount of waterand request to the humidity strictly, but because of its root distribute moreshallowly, absorb ability more weakly, compare with a cultivation outside, inglasshouse the water effect the soil, the plant and the environment humiditymore direct, more irrigation induce more steam, bring on water wasting, andwill cause the glasshouse humidity increment, more disease occur. So thestudy on the cucumber root area humidity distribute in glasshouse have thegood reference value.Greenhouse have characteristics, including well controllable, highhumidity, low wind speed, high density of CO2, little difference intemperature between day and night etc. Greenhouse planting is an effectivemeasure in increasing production and economizing on water. The researchon water and hot movement of greenhouse soil-plant-environmentcontinuous body (SPAC), help to clarify the regulation of the revenue andexpenditure, the movement and transformation of greenhouse water and hotin the system, as well as can offer the effective theoretical foundation for theenvironment controlling of the greenhouse, economizing on water,increasing production and reducing energy consumption.Since 1960s, we have already started the research of the start point ofirrigation by using soil water tension. In 1980s it was used on vegetablesproduction. But the proper soil water tension will be changed with thedifference of soil, crop and the condition, but the result did not turn uptrumps.Along with the development of the computer technology, we can inspectand trace the crop physical information and environment all day. Andestablishment agriculture save water irrigation develops quickly due to thedevelopment of the theory and technology of save water. The technology ofsave water has been spread out.After the 1980s, Mathematics simulation has been used on theresearch of soil water. Computer technology makes the complexity equationliberation possible. The precision of the equation result lie on the physicalreference of soil water,Chinese scholar do some research on that. They setup the movement Model of the soil water on the soil water movement rule,which improve the precision of the soil water forecast and do favour on thefarm irrigation. Our nation has published the monograph of soil watermovement. On the course of the development, the single dimensionnon-saturation mathematics simulation of the soil water movement has beenused on the farm, but the double dimension's still being research in thelaboratory.This paper mainly research and explore on the soil water movementunder the drop irrigation in the greenhouse, based on the summary researchresult and experiential before, and combine the thesis characteristic.Established the mathematics Model of the root soil water movement basedon the dynamic mechanics theory of soil water, and made the computermathematics simulation. The mainly research and the result as follows:Collected much lately information on the soil water movement under thecrop growth, summed up the result and experience related to the thesis,bring out the clearly explore thought and the problem of need be careful.Have supervised the environment of the greenhouse for 3 months, andgathered much data, including the environment information of thegreenhouse, weather information, cucumber physical information. Analyzedand computed these data and got the conclusion. The temperature of thegreenhouse around 10℃~40℃, the air humidity is affected obviously, thehumidity is descend quickly along with the ascend of the temperature, andthe crop rising will effect the humidity's change. Under the sufficiency water,the relativity between the leaf flow of water and the soil flow of water is notobvious. And have the obviously relativity when the crop water intimidate,And change of the leaf flow of water similar with the soil flow of water. butthe later lags the front.Set up the Mathematics Model of the soil water movement, based onthe SPAC System, and soil water dynamic mechanics theory. Analyze andconstruct the double dimension sop function on the cucumber radix, do themathematics analyze on the mathematics Model by using the finite...