Dissertation
Dissertation > Agricultural Sciences > Crop > Economic crops > Fiber crops > Cotton

The Monitoring of Farmland Soil Moisture and Water Management System for Cotton on Drip Irrigation under Mulch

Author LiuHao
Tutor MaFuYu
School Shihezi University
Course Crop Cultivation and Farming System
Keywords Temporal and spatial variation Irrigation strategy Contour map Monitoring model Model Checking
CLC S562
Type Master's thesis
Year 2010
Downloads 37
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Study to precocious Hybrid Cotton Shiza in 2 for the material, in 2008 to 2009 Shihezi national agricultural high-tech demonstration garden set six water treatment (mild drought (65?, Pre-irrigation drip tape just below the 0-60cm soil layer reaches 65% of the field capacity, the same below), control (75?, the threshold processing), high frequency irrigation (3d18mm irrigation once every 3 days, 18mm irrigation, the same below), high-frequency irrigation amount (3d30mm ), low frequency the irrigation amount (5d18mm), low frequency and large amount of irrigation (5d30mm)), designed to drip irrigation of cotton fields during the blooming period by analyzing production and Temporal and spatial variation of soil moisture under different irrigation frequency and amount of irrigation conditions, determine the current best cotton irrigation under drip irrigation conditions mode, which build a drip irrigation of cotton farmland single point of moisture monitoring model to provide the basis for drip irrigation of cotton fields moisture monitoring and irrigation forecast. The key findings are as follows: (1) the conduct of six water treatment analysis, the results show that the the processing of 5d30mm yield the most close to the northern region to exploit its potential water supply of cotton production mode, and the entire irrigation cycle point soil volumetric water content basic maintained at 33.8% (converted to relative field capacity water rate of 75%) to 38.3% (converted to relative rate of 85% field capacity) within the range is more suitable for the growth of crops, so 5d30mm deal with the root layer 33.8% -38.3% volumetric water content is tentatively scheduled for the northern hybrid cotton suitable soil moisture threshold. (2) rate of 33.8% to 38.3% volumetric soil moisture irrigation threshold, the horizontal direction from the emitter 18.25cm section 30cm of the soil moisture content can be predicted here 0-60cm soil layer soil water content (SWC) the dynamic changes of the predicted value of the prediction model as a basis to establish a single point of moisture guidance irrigation. (3) the use of off-site in 2009 with the texture of the soil moisture content of the model was validated, the results show that the relative error is 9.95%, and the root mean square error of 0.0192, the correlation coefficient and consistency coefficients were 0.9450 and 0.9998, close to 1, confidence a live 0.0051 is less than 0.01, indicating that the model can be used to predict soil moisture conditions, the model has good predictability and strong conformity. (4) daily minimum temperature and dew point temperature conversion relational model, the model with a single point of moisture prediction model is applied to simplify the Penman-Monteith crop potential evapotranspiration model, the model final inspection results show that the relative error and root mean square error, respectively 5.23% and 1.30%, consistency coefficient of 0.9998, a confidence level of 0.0465 is less than 0.05, indicating that the model to achieve the 95% confidence level. (5) to simplify the Penman-Monteith crop evapotranspiration calculation model was constructed based on the farmland soil moisture monitoring and water management system based on WEB platform.

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