Fertigation uniformity and evaporation drift losses of center pivot irrigation system
ZHANG Meng, ZHAO Weixia, LI Jiusheng*, LI Yanfeng
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, China
Abstract:Uniformity is an important parameter in operation of center pivot irrigation system, and evaporation drift loss(EDLs)is a significant factor affecting water and fertilizer utilization efficiency of sprinkler irrigation system. In this study, the relationship between flow rate and operational range of diaphragm metering pump connected with a center pivot of 0.15 MPa pressure was tested. Field experiments were conducted to evaluate uniformity of water and fertilizer application and EDLs. The results indicated that RMSE of injection when connected with center pivot was 9.0% and a small relative error(RE)was achieved under in the operational range of 60%-100%(RE≤5.6%), while a substantially higher RE(RE≥13.3%)was got in the range of 20%-40%. When the pivot rotational speed was 100% of the full speed, the modified Heermann-Hein uniformity coefficients of radial irrigation and fertilizer application were equalbasically, with variation ranges of 80%-85% and 78%-86%, respectively, which were all less than the uniformity of radial solution concentration ranged in the range 96%-99%. There was no significant difference in uniformity of fertilizer solution application and solution concentration between different fertilizer types and concentrations. When the wind speed was less than 2 m/s, EDLs were ranged in 1.5%-10.1%(average 5.1%)with center pivot.
[1]赵春江,薛绪掌,王秀,等. 精准农业技术体系的研究进展与展望[J]. 农业工程学报, 2003,19(4):7-12. ZHAO Chunjiang, XUE Xuzhang, WANG Xiu, et al. Advance and prospects of precision agriculture technology system[J]. Transactions of the CSAE, 2003,19(4):7-12.(in Chinese)[2]郎景波,李莹,李铁男. 国内外大型喷灌机生产的发展历程和现状[J]. 节水灌溉, 2011(9):42-43. LANG Jingbo, LI Ying, LI Tienan. Development process and status of domestic and foreign large-scale sprinkler irrigation system production[J]. Water saving irrigation, 2011(9):42-43.(in Chinese)[3]THREADGILL E D. Chemigation via sprinkler irrigation: current status and future development[J]. Applied engineering in agriculture, 1985, 1(1): 16-23.[4]MOLLE B, TOMAS S, HENDAWI M, et al. Evaporation and wind drift losses during sprinkler irrigation influenced by droplet size distribution [J]. Irrigation & drainage, 2012, 61(2):240-250.[5]赵伟霞,李久生,栗岩峰. 考虑喷灌田间小气候变化作用确定灌水技术参数方法探讨[J]. 中国生态农业学报, 2012,20(9):1166-1172. ZHAO Weixia, LI Jiusheng, LI Yanfeng. Determining sprinkler technical parameters with consideration for microclimate modification effects[J]. Chinese journal of eco-agriculture, 2012,20(9):1166-1172.(in Chinese)[6]徐红,龚时宏,李琳. 华北地区喷灌蒸发损失田间测试研究[J]. 节水灌溉, 2014(1):17-19. XU Hong, GONG Shihong, LI Lin. Field test of sprinkler irrigation evaporation in north China[J]. Water saving irrigation, 2014(1):17-19.(in Chinese)[7]赵伟霞,李久生,蔡焕杰. 扩展CUPID模型模拟喷灌水利用率[J]. 水利学报, 2012,43(11):1357-1364. ZHAO Weixia, LI Jiusheng, CAI Huanjie. Modeling sprinkler efficiency by using an extended CUPID model[J]. Journal of hydraulic engineering, 2012,43(11):1357-1364.(in Chinese)[8]ORTíZ J N, TARJUELO J M, JUAN J A D. Characterisation of evaporation and drift losses with centre pivots.[J]. Agricultural water management, 2009, 96(11):1541-1546.[9]KING B A, DUNGAN R S, BJORNEBERG D L. Eva-luation of center pivot sprinkler wind drift and evaporation loss[C]//2012 ASABE Annual International Meeting.Dallas:[s.n.], 2012:12-1336891.[10]李久生,饶敏杰,李蓓. 喷灌施肥灌溉均匀性对土壤硝态氮空间分布影响的田间试验研究[J]. 农业工程学报, 2005,21(3):51-55. LI Jiusheng, RAO Minjie, LI Bei. Spatial distribution of nitrate in soil as affected by uniformity of sprinkler fertigation[J]. Transactions of the CSAE, 2005,21(3):51-55.(in Chinese)[11]李久生,王迪,栗岩峰. 现代灌溉水肥管理原理与应用[M]. 郑州:黄河水利出版社, 2008.[12]严海军,王志鹏,马开. 圆形喷灌机注肥泵的设计与试验研究[J]. 排灌机械工程学报, 2014, 32(5): 456-460. YAN Haijun,WANG Zhipeng,MA Kai. Design and experiment on fertigation plunger pump in center pivot irrigation system[J]. Journal of drainage and irrigation machinery engineering, 2014, 32(5): 456-460.(in Chinese)[13]DETTORI M, CESARACCIO C, MOTRONI A, et al. Using CERES-Wheat to simulate durum wheat production and phenology in Southern Sardinia, Italy[J]. Field crops research, 2011,120(1):179-188.[14]全国农业机械标准化技术委员会.农业灌溉设备中心支轴式和平移式喷灌机水量分布均匀度的测定:GB/T 19797—2005 [S].北京:中国标准出版社,2005.[15]李永冲. 圆形喷灌机水力性能的理论与试验研究及其优化设计[D]. 北京:中国农业大学, 2016.