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Huang K.,Guangxi University | Huang K.,Guangxi Institute of Hydraulic Research | Cai D.,Guangxi University | Pan W.,Guangxi Institute of Hydraulic Research | Guo J.,Guangxi Institute of Hydraulic Research
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

Surface drip irrigation is commonly used for efficient water-saving irrigation in latosolic red soil of sugarcane fields in Guangxi Autonomous Region, China. Selection of appropriate layout parameters of drip tapes for irrigation in latosolic red soil of sugarcane fields has rarely been studied and it is important to improve irrigation quality and water use efficiency. The objectives of this study were: 1) to analyze the effects of the main technical parameters of drip tapes on the soil water movement and change in soil water content under drip irrigation; 2) to summarize the basic requirements of appropriately determining the main technical parameters of drip tapes; 3) to determine the appropriate design parameters of drip tapes for irrigation in latosolic red soil of sugarcane fields based on project cost, project management and operation patterns, and water demand of sugarcane crop in different growth stages. To address the above objectives, representative latosolic red soil sample was collected from sugarcane field in Guangxi. First, a laboratory experiment of water movement with surface drip irrigation was performed in soil columns under irrigation conditions with different emitter discharge rates and emitter spacing (30 cm vs. 1.38 L/h, 40 cm vs. 2.20 L/h, and 50 cm vs. 2.80 L/h, respectively). Changes in the surface ponding radius, wetted surface radius and vertical wetted depth were monitored during the experiment. Then, the main parameters for model building were from the physical properties of the soil and the results of the experiment. A model of soil water movement under double-point source of drip irrigation was built using HYDRUS-3D. Next, the effects of emitter spacing and emitter discharge rate on irrigation uniformity were analyzed using the HYDRUS-3D model. Appropriate parameters ranges for drip irrigation were determined based on the results of model analysis. Further, irrigation uniformity, project cost, project management and operation, and water demand of sugarcane crop at different growth stages were taken into consideration to determine appropriate design parameters of drip tapes for irrigation in latosolic red soil of sugarcane fields in Guangxi. The results showed that: 1) The simulation results of the Hydrus-3D model of soil water movement were reliable as compared with the experimental data, indicating the reliability of the model used for the following study; 2) Emitter spacing was the primary factor affecting irrigation uniformity; at the emitter discharge rate of 1.38 L/h, drip tapes with the emitter spacing of 30 cm yielded higher irrigation uniformity, compared with the larger emitter spacing (40 or 50 cm); 3) At the same emitter spacing, irrigation uniformity was improved with the higher emitter discharge rate; At the emitter spacing of 40 cm, drip tapes the higher rate (2.20 or 2.80 L/h) resulted in the higher irrigation uniformity. Given the slow water infiltration in latosolic red soil, we recommended to use drip tapes with lower emitter discharge rate on the premise of meeting the requirement of irrigation uniformity. Taking into account of project cost, project management and operation patterns and water demand of sugarcane, we suggested optimal layout parameters of drip tapes in latosolic red soil of sugarcane fields in Guangxi: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, irrigation duration in the early and vigorous growth stage of sugarcane 3.5 and 6.5 h. This study provides guidance for drip irrigation project design in sugarcane fields. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.


Huang K.,Guangxi University | Huang K.,Guangxi Institute of Hydraulic Research | Cai D.,Guangxi University | Guo J.,Guangxi Institute of Hydraulic Research
Metallurgical and Mining Industry | Year: 2015

This study investigated water movement in the major soil types in sugarcane fields with drip irrigation in Guangxi, China. Laboratory simulation experiment of water movement with drip irrigation was performed in soil columns at three emitter flow rates (1.38, 2.20 and 2.80 L/h). The results showed that: 1) Soil type greatly affected the shape of the wetted soil volume (WSV). With gradually increasing hydraulic conductivity, the ellipsoid shape of the WSV gradually changed from wide-shallow to narrow-deep. 2) Soil type also greatly affected water distribution in the WSV. With gradually increasing hydraulic conductivity, the size of the WSV increased progressively while the average soil water content gradually decreased. 3) Drip irrigation amount was the major determinant of the size of the WSV. Both the radial and vertical wetted distances of the soil had an exponential relationship with irrigation amount.


Huang K.,Guangxi University | Huang K.,Guangxi Institute of Hydraulic Research | Cai D.,Guangxi University | Guo J.,Guangxi Institute of Hydraulic Research | Pan W.,Guangxi Institute of Hydraulic Research
Open Biotechnology Journal | Year: 2015

A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus-3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L. © Huang et al.


Tan J.,Shanghai Academy of Environmental science | Guo J.,Guangxi Institute of Hydraulic Research | Wu J.,Shanghai Academy of Environmental science | Pan W.,Guangxi Institute of Hydraulic Research | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

Efficient, water-saving irrigation modes are commonly used in the sugarcane fields of latosolic red soils in the Guangxi Zhuang Autonomous Region, China. This research studied the effects of different irrigation treatments on photosynthetic characteristics of sugarcane. Because photosynthesis is an important process in plant dry matter accumulation, this research has implications for the development of high-efficiency cultivation methods that produce high yields of sugarcane. We planted the sugarcane cultivar Liucheng 05-136 under 6 types of irrigation modes: no irrigation, subsurface drip irrigation, surface drip irrigation, pipe irrigation, sprinkler irrigation, and micro sprinkler irrigation. Field measurements of net photosynthetic rate and related environmental factors (soil water content, soil temperature, air temperature, relative air humidity, soil organic matter, soil available nitrogen, soil available phosphorus, and soil available potassium content) were conducted at the Sugarcane Efficient Water-saving Irrigation Test Base in Chongzuo City from March to December, 2015 for different growth phases of sugarcane (tillering stage, early, peak and late stages of elongation, and maturation stage). Additionally, the differences in net photosynthetic rate of sugarcane under different irrigation modes were investigated with a multiple comparison method, and the relationship between environmental factors and net photosynthetic rate was analyzed using stepwise regression and path analysis. Results showed that the mean net photosynthetic rates of sugarcane under no irrigation, subsurface drip irrigation, surface drip irrigation, pipe irrigation, sprinkler irrigation, and micro sprinkler irrigation were 18.53, 29.23, 28.50, 26.65, 25.94 and 23.66 μmol/(m2•s), respectively. Net photosynthetic rate was the lowest under the no irrigation mode, while the highest value appeared under the subsurface drip irrigation mode, which was 57.74%, 23.54%, 12.68%, 9.68% and 2.56% higher than that of no irrigation, pipe irrigation, sprinkler irrigation, micro sprinkler irrigation and surface drip irrigation, respectively. Therefore, irrigation can significantly improve sugarcane photosynthetic rate (P<0.05). Path analysis results showed that soil water content, air temperature and soil fertility were the main environmental factors influencing sugarcane net photosynthetic rate on the whole, but some differences existed between irrigation modes. Soil fertility was a key variable for photosynthetic rate under no irrigation and subsurface drip irrigation, while soil water content and soil available nitrogen content had significant effects on photosynthetic rate under surface drip irrigation. In the case of pipe irrigation, soil available potassium and air temperature were the major factors. For sprinkler and micro sprinkler irrigation, the main factors were soil water content and air temperature. It may adjust the influence of irrigation treatments on photosynthesis through the regulation of environmental factors (air temperature and humidity, and soil physical and chemical properties). In addition, each factor mutually acts to promote or restrain the photosynthesis process, showing a comprehensive effect. In terms of soil water content, its influence on photosynthesis was reflected in the effect on absorption of nitrogen, phosphorus and potassium nutrient elements for sugarcane under no irrigation, subsurface and surface drip irrigation modes. Comprehensive analysis showed that the subsurface drip irrigation treatment effectively improved sugarcane photosynthesis. Subsurface drip irrigation will be more suitable for the cultivation of sugarcane in the latosolic red soils in the Guangxi Zhuang Autonomous Region. Furthermore, according to the different irrigation modes, ensuring favorable control of soil water content in combination with other main influencing factors, can further improve sugarcane net photosynthetic rate, and consequently increase the yield of sugarcane. © 2016, Chinese Society of Agricultural Engineering. All right reserved.

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