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| 1 | Impacts of center pivot irrigation system uniformity on growth of potato crop and residual soil nitrogen显示文摘Maintaining the homogeneity of soil nitrogen(N)and plant vigor across agricultural fields is a major concern for farmers and agricultural scheme planners,particularly fields that are irrigated through pressurized systems,such as center pivots.Therefore,this study was carried out on a 30 hm2 potato field located 650 km south of Riyadh,the capital city of the Kingdom of Saudi Arabia,to investigate the impacts of the center pivot irrigation distribution uniformity on the crop development and the spatial distribution of residual soil N.Irrigation performance test was designed to investigate water application rate and distribution uniformities.The overall water application uniformity coefficients(Cu),determined through Christiansen(Cud)and Heerman(CuH)methods,were determined at 81.29%and 80.64%,respectively.However,the overall water distribution uniformity(Du)was determined at 70%.A considerable variability in the distribution uniformity of irrigation water was observed across the experimental field(a Du value of 67%over the medium spans compared to a Du value of 88%over the inner spans).Results of this study showed a linear correlation between the irrigation water distribution uniformity and the soil N(R^(2)=0.88).On the other hand,the vegetation cover distribution,indicated by the Cumulative Normalized Difference Vegetation Index(CNDVI),was not found to be much responsive to the irrigation distribution uniformity(R^(2)=0.11).A time series of successive NDVI maps extracted throughout the potato crop growth stages showed a consistent trend in the distribution of NDVI across the field,with R2 values that ranged between 0.25-0.73. | Khalid A.Al-Gaadi Abdalhaleem A.Hassaballa ElKamil Tola Ahmed G.Kayad Rangaswamy Madugundu Fahad Assiri Mohamed Edrris Ahmed Alameen Haroon Edrees | 2019 | International Journal of Agricultural and Biological Engineering2019，12，1： | 2 |
| 2 | Effects of terrain slope on water distribution and application uniformity for sprinkler irrigation显示文摘In order to provide practical parameters for sprinkler irrigation system design on slope land,the effects of terrain slope on water distribution,sprinkler throw radius and water application uniformity were analyzed for the Rainbird LF1200 sprinkler.The results show that,the water distribution curve is roughly“heart-shape”on slope land,and the water has the trend of focusing on the upslope with the increase of the slope.Throw radius decreases for the upslope and increases for the downslope as the slope increases.For the convenience of sprinkler irrigation system design on slope land,a formula for computing throw radius on slope land was put forward by the theoretical derivation,and it was verified by the experimental data.The impact of sprinkler pressure and spacing on CU for slope land is more significant than that for flat ground.Under the experimental condition,no significant change is found regarding the influence of terrain slope on water application uniformity at the confidence level of 95%.Taking irrigation quality and economy into account,the Rainbird LF1200 sprinkler should be operated at the manufactures’recommended pressure,rather than low pressure,with sprinkler spacing from 8 m×8 m to 10 m×10 m below the slope of 0.15 in practice. | Lin Zhang Xin Hui Junying Chen | 2018 | International Journal of Agricultural and Biological Engineering2018，11，3： | 1 |
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